| Table 1. Scientific names and current taxonomic usages. Key to original sources: (1) Bailey (1970), (2) Benson and Darrow (1981), (3) Critchfield and Little (1966), (4) Little (1971), (5) Vierick and Little (1975), (6) Little (1976), (7) Little (1977), (8) Little (1978), (9) Little (1981), (10) Yang (1970). Currently accepted botanical names were verified in Tropicos (Missouri Botanical Garden, 2012a), eFloras (Missouri Botanical Garden, 2012b), and ITIS (USGS Center for Biological Informatics, 2012) nomenclatural databases. |
|
| Scientific Name |
Currently accepted scientific name (synonym) |
Common Name |
USGS PP 1650– |
Original source |
| Abies amabilis (Dougl.) Forbes |
----- |
Pacific silver fir |
A, D |
4, 5 |
| Abies balsamea (L.) Mill. |
----- |
balsam fir |
A |
4 |
| Abies concolor (Gord. & Glend.) Lindl. |
----- |
white fir |
A |
4 |
| Abies grandis (Dougl.) Lindl. |
----- |
grand fir |
A |
4 |
| Abies lasiocarpa (Hook.) Nutt. |
----- |
subalpine fir |
A, D |
4, 5 |
| Abies magnifica A. Murr. |
----- |
California red fir |
A |
4 |
| Abies procera Rehd. |
----- |
noble fir |
A |
4 |
| Acacia berlandieri Benth. |
Senegalia berlandieri (Benth.) Britton & Rose |
Berlandier acacia |
C |
6 |
| Acacia greggii A. Gray |
Senegalia greggii (A. Gray) Britton & Rose |
catclaw acacia |
B |
6 |
| Acacia rigidula Benth. |
Vachellia rigidula (Benth.) Seigler & Ebinger |
blackbrush acacia |
C |
6 |
| Acacia roemeriana Scheele |
Senegalia roemeriana (Scheele) Britton & Rose |
Roemer acacia |
C |
6 |
| Acacia tortuosa (L.) Willd. |
Vachellia tortuosa (L.) Seigler & Ebinger |
twisted acacia |
C |
6 |
| Acacia wrightii Benth. |
Senegalia greggii (A. Gray) Britton & Rose |
Wright acacia |
C |
6 |
| Acer barbatum Michx. |
Acer floridanum (Chapm.) Pax |
Florida maple |
B |
7 |
| Acer circinatum Pursh |
----- |
vine maple |
B |
6 |
| Acer glabrum Torr. |
----- |
Rocky Mountain maple |
B, D |
5, 6 |
| Acer grandidentatum Nutt. |
----- |
bigtooth maple |
B |
6 |
| Acer leucoderme Small |
----- |
chalk maple |
B |
7 |
| Acer macrophyllum Pursh |
----- |
bigleaf maple |
B |
4 |
| Acer negundo L. |
----- |
boxelder |
B |
4 |
| Acer nigrum Michx. f. |
----- |
black maple |
B |
4 |
| Acer pensylvanicum L. |
----- |
striped maple |
B |
7 |
| Acer rubrum L. |
----- |
red maple |
B |
4 |
| Acer saccharinum L. |
----- |
silver maple |
B |
4 |
| Acer saccharum Marsh. |
----- |
sugar maple |
B |
4 |
| Acer spicatum Lam. |
----- |
mountain maple |
B |
7 |
| Aesculus californica (Spach) Nutt. |
----- |
California buckeye |
B |
6 |
| Aesculus glabra Willd. |
----- |
Ohio buckeye |
B |
4 |
| Aesculus octandra Marsh. |
Aesculus flava Sol. |
yellow buckeye |
B |
4 |
| Aesculus parviflora Walt. |
----- |
bottlebrush buckeye |
C |
7 |
| Aesculus pavia L. |
----- |
red buckeye |
C |
7 |
| Aesculus sylvatica Bartr. |
----- |
painted buckeye |
C |
7 |
| Agave utahensis Engelm. |
----- |
Utah agave |
B |
2 |
| Alnus oblongifolia Torr. |
----- |
Arizona alder |
B |
6 |
| Alnus rhombifolia Nutt. |
----- |
white alder |
B |
6 |
| Alnus rubra Bong. |
----- |
red alder |
B, D |
4, 5 |
| Alnus rugosa (Du Roi) Spreng. |
Alnus incana ssp. rugosa (Du Roi) R.T. Clausen |
speckled alder |
B |
7 |
| Alnus serrulata (Ait.) Willd. |
----- |
hazel alder |
B |
7 |
| Alnus sinuata (Reg.) Rydb. |
Alnus viridis ssp. sinuata (Regel) Á. Löve & D. Löve |
Sitka alder |
B, D |
5, 6 |
| Alnus tenuifolia Nutt. |
Alnus incana ssp. tenuifolia (Nutt.) Breitung |
thinleaf alder |
B, D |
5, 6 |
| Amelanchier alnifolia (Nutt.) Nutt. |
----- |
western serviceberry |
B, D |
5, 6 |
| Amelanchier arborea (Michx. f.) Fern. |
----- |
downy serviceberry |
B |
7 |
| Amelanchier interior Nielsen |
----- |
inland serviceberry |
C |
7 |
| Amelanchier sanguinea (Pursh) DC. |
----- |
roundleaf serviceberry |
C |
7 |
| Amelanchier utahensis Koehne |
----- |
Utah serviceberry |
B |
6 |
| Annona glabra L. |
----- |
pond-apple |
C |
8 |
| Aralia spinosa L. |
----- |
devils-walkingstick |
C |
7 |
| Arbutus arizonica (A. Gray) Sarg. |
----- |
Arizona madrone |
B |
6 |
| Arbutus menziesii Pursh |
----- |
Pacific madrone |
B |
4 |
| Arbutus texana Buckl. |
Arbutus xalapensis Kunth |
Texas madrone |
B |
6 |
| Arctostaphylos pringlei Parry |
----- |
Pringle manzanita |
B |
6 |
| Ardisia escallonioides Schiede & Deppe |
----- |
marlberry |
C |
8 |
| Artemisia tridentata Nutt. |
----- |
big sagebrush |
B |
6 |
| Asimina triloba (L.) Dunal |
----- |
pawpaw |
C |
7 |
| Avicennia germinans (L.) L. |
----- |
black-mangrove |
C |
7, 8 |
| Baccharis halimifolia L. |
----- |
eastern baccharis |
C |
7 |
| Betula alleghaniensis Britton |
----- |
yellow birch |
B |
4 |
| Betula lenta L. |
----- |
sweet birch |
B |
4 |
| Betula nigra L. |
----- |
river birch |
B |
4 |
| Betula occidentalis Hook. |
----- |
water birch |
B |
6 |
| Betula papyrifera Marsh. |
----- |
paper birch |
B, D |
4, 5 |
| Betula populifolia Marsh. |
----- |
gray birch |
B |
4 |
| Bumelia celastrina H.B.K. |
Sideroxylon celastrinum (Kunth) T.D. Penn. |
saffron-plum |
C |
6, 8 |
| Bumelia lanuginosa (Michx.) Pers. |
Sideroxylon lanuginosum Michx. |
gum bumelia |
C |
6, 7 |
| Bumelia lycioides (L.) Pers. |
Sideroxylon lycioides L. |
buckthorn bumelia |
C |
7 |
| Bumelia tenax (L.) Willd. |
Sideroxylon tenax L. |
tough bumelia |
C |
7 |
| Bursera fagaroides (H.B.K.) Engler |
----- |
fragrant bursera |
B |
6 |
| Bursera microphylla A. Gray |
----- |
elephanttree |
B |
6 |
| Bursera simaruba (L.) Sarg. |
----- |
gumbo-limbo |
C |
8 |
| Caesalpinia mexicana A. Gray |
----- |
Mexican poinciana |
C |
6 |
| Canotia holacantha Torr. |
----- |
canotia |
B |
6 |
| Carpinus caroliniana Walt. |
----- |
American hornbeam |
B |
4 |
| Carya aquatica (Michx. f.) Nutt. |
----- |
water hickory |
B |
4 |
| Carya cordiformis (Wangenh.) K. Koch |
----- |
bitternut hickory |
B |
4 |
| Carya floridana Sarg. |
----- |
scrub hickory |
B |
7 |
| Carya glabra (Mill.) Sweet |
----- |
pignut hickory |
B |
4 |
| Carya illinoensis (Wangenh.) K. Koch |
Carya illinoinensis (Wangenh.) K. Koch |
pecan |
B |
4 |
| Carya laciniosa (Michx. f.) Loud. |
----- |
shellbark hickory |
B |
4 |
| Carya myristicaeformis (Michx. f.) Nutt. |
Carya myristiciformis (F. Michx.) Nutt. |
nutmeg hickory |
B |
4 |
| Carya ovata (Mill.) K. Koch |
----- |
shagbark hickory |
B |
4 |
| Carya pallida (Ashe) Engl. & Graebn. |
----- |
sand hickory |
B |
7 |
| Carya texana Buckl. |
----- |
black hickory |
B |
7 |
| Carya tomentosa Nutt. |
----- |
mockernut hickory |
B |
4 |
| Castanea alnifolia Nutt. |
Castanea pumila (L.) Mill. |
Florida chinkapin |
B |
7 |
| Castanea dentata (Marsh.) Borkh. |
----- |
American chestnut |
B |
7 |
| Castanea ozarkensis Ashe. |
----- |
Ozark chinkapin |
B |
7 |
| Castanea pumila Mill. |
----- |
Allegheny chinkapin |
B |
7 |
| Castanopsis chrysophylla (Dougl.) A. DC. |
Chrysolepis chrysophylla (Douglas ex Hook.) Hjelmq. |
golden chinkapin |
B |
4 |
| Ceanothus spinosus Nutt. |
----- |
spiny ceanothus |
C |
6 |
| Ceanothus thyrsiflorus Eschsch. |
----- |
blueblossom |
C |
6 |
| Celtis laevigata Willd. |
----- |
sugarberry |
B |
4 |
| Celtis occidentalis L. |
----- |
hackberry |
B |
4 |
| Celtis reticulata Torr. |
Celtis laevigata var. reticulata (Torr.) L. Benson |
netleaf hackberry |
B |
6 |
| Celtis tenuifolia Nutt. |
----- |
Georgia hackberry |
C |
7 |
| Cephalanthus occidentalis L. |
----- |
common buttonbush |
C |
6, 7 |
| Cercidium floridum Benth. |
Parkinsonia florida (Benth. ex A. Gray) S. Watson |
blue paloverde |
B |
6 |
| Cercidium macrum Johnst. |
Parkinsonia texana var. macra (I.M. Johnston) Isely |
border paloverde |
B |
6 |
| Cercidium microphyllum (Torr.) Rose & Johnst. |
Parkinsonia microphylla Torr. |
yellow paloverde |
B |
6 |
| Cercis canadensis L. |
----- |
eastern redbud |
C |
6, 7 |
| Cercis occidentalis Torr. |
----- |
California redbud |
C |
6 |
| Cercocarpus betuloides Nutt. |
----- |
birchleaf cercocarpus |
B |
6 |
| Cercocarpus breviflorus A. Gray |
----- |
hairy cercocarpus |
B |
6 |
| Cercocarpus ledifolius Nutt. |
----- |
curlleaf cercocarpus |
B |
6 |
| Cereus giganteus Engelm. |
Carnegia gigantea (Engelm.) Britton & Rose |
saguaro |
B |
6 |
| Chamaecyparis lawsoniana (A. Murr.) Parl. |
----- |
Port-Orford-cedar |
A |
4 |
| Chamaecyparis nootkatensis (D. Don) Spach |
Callitropsis nootkatensis (D. Don) Florin |
Alaska-cedar |
A, D |
4, 5 |
| Chamaecyparis thyoides (L.) B.S.P. |
----- |
Atlantic white-cedar |
A |
4 |
| Chilopsis linearis (Cav.) Sweet |
----- |
desert-willow |
B |
6 |
| Chionanthus virginicus L. |
----- |
fringetree |
C |
7 |
| Chrysobalanus icaco L. |
----- |
cocoplum |
C |
8 |
| Chrysophyllum oliviforme L. |
----- |
satinleaf |
C |
8 |
| Citharexylum berlandieri Robinson |
----- |
Berlandier fiddlewood |
C |
6 |
| Cladrastis kentukea (Dum.-Cours.) Rudd |
----- |
yellowwood |
C |
7 |
| Clethra acuminata Michx. |
----- |
cinnamon clethra |
C |
7 |
| Cliftonia monophylla (Lam.) Britton |
----- |
buckwheat-tree |
C |
7 |
| Coccoloba diversifolia Jacq. |
----- |
pigeon-plum |
C |
8 |
| Condalia globosa Johnst. |
----- |
bitter condalia |
C |
6 |
| Condalia hookeri M.C. Johnst. |
----- |
bluewood |
C |
6 |
| Cordia boissieri A. DC. |
----- |
anacahuita |
C |
6 |
| Cornus alternifolia L. f. |
----- |
alternate-leaf dogwood |
C |
7 |
| Cornus drummondii C.A. Meyer |
----- |
roughleaf dogwood |
C |
7 |
| Cornus florida L. |
----- |
flowering dogwood |
B |
4 |
| Cornus glabrata Benth. |
----- |
brown dogwood |
C |
6 |
| Cornus nuttallii Audubon |
----- |
Pacific dogwood |
C |
6 |
| Cornus occidentalis (Torr. & Gray) Coville |
Cornus sericea ssp. occidentalis (Torr. & Gray) Fosberg |
western dogwood |
C |
6 |
| Cornus racemosa Lam. |
----- |
gray dogwood |
C |
7 |
| Cornus rugosa Lam. |
----- |
roundleaf dogwood |
C |
7 |
| Cornus sessilis Torr. |
----- |
blackfruit dogwood |
C |
6 |
| Cornus stolonifera Michx. |
Cornus sericea ssp. sericea |
red-osier dogwood |
B, D |
5, 7 |
| Cornus stricta Lam. |
Cornus foemina P. Mill. |
stiffcornel dogwood |
C |
7 |
| Corylus cornuta Marsh. |
----- |
beaked hazel |
B |
7 |
| Cotinus obovatus Raf. |
----- |
American smoketree |
C |
7 |
| Cowania mexicana D. Don |
Purshia mexicana (D. Don) S.L. Welsh |
cliffrose |
B |
6 |
| Crataegus columbiana Howell |
Crataegus chrysocarpa var. piperi (Britton) Kruschke / Crataegus williamsii Eggl. |
Columbia hawthorn |
C |
6 |
| Crataegus douglasii Lindl. |
Crataegus douglasii Lindl. / Crataegus rivularis Nutt. |
black hawthorn |
C |
6 |
| Crataegus erythropoda Ashe |
----- |
Cerro hawthorn |
C |
6 |
| Crataegus saligna Greene |
----- |
willow hawthorn |
C |
6 |
| Crataegus tracyi Ashe |
----- |
Tracy hawthorn |
C |
6 |
| Cupressus arizonica Greene |
Callitropsis arizonica (Greene) D.P. Little |
Arizona cypress |
A |
4 |
| Cyrilla racemiflora L. |
----- |
swamp cyrilla |
C |
7 |
| Dalea spinosa A. Gray |
Psorothamnus spinosus (A. Gray) Barneby |
smokethorn |
B |
6 |
| Diospyros texana Scheele |
----- |
Texas persimmon |
C |
6 |
| Diospyros virginiana L. |
----- |
common persimmon |
B |
4 |
| Ehretia anacua (Mier & Berland.) Johnst. |
----- |
anaqua |
C |
6 |
| Erythrina flabelliformis Kearney |
----- |
southwestern coralbean |
B |
6 |
| Erythrina herbacea L. |
----- |
eastern coralbean |
C |
7 |
| Esenbeckia berlandieri Baill. |
----- |
Berlandier esenbeckia |
C |
6 |
| Eugenia axillaris (Sw.) Willd. |
----- |
white stopper |
C |
8 |
| Eugenia foetida Pers. |
----- |
boxleaf stopper |
C |
8 |
| Euonymus atropurpureus Jacq. |
----- |
eastern wahoo |
C |
7 |
| Euonymus occidentalis Nutt. |
----- |
western wahoo |
C |
6 |
| Eysenhardtia polystachya (Ortega) Sarg. |
----- |
kidneywood |
C |
6 |
| Eysenhardtia texana Scheele |
----- |
Texas kidneywood |
C |
6 |
| Fagus grandifolia Ehrh. |
----- |
American beech |
B |
4 |
| Ficus aurea Nutt. |
----- |
Florida strangler fig |
C |
8 |
| Forestiera acuminata (Michx.) Poir. |
----- |
swamp-privet |
C |
7 |
| Forestiera angustifolia Torr. |
----- |
Texas forestiera |
C |
6 |
| Forestiera segregata (Jacq.) Krug & Urban |
----- |
Florida-privet |
C |
7 |
| Fraxinus americana L. |
----- |
white ash |
B |
4 |
| Fraxinus anomala Torr. |
----- |
singleleaf ash |
B |
6 |
| Fraxinus berlandieriana A. DC. |
----- |
Berlandier ash |
B |
6 |
| Fraxinus caroliniana Mill. |
----- |
Carolina ash |
B |
7 |
| Fraxinus cuspidata Torr. |
----- |
fragrant ash |
B |
6 |
| Fraxinus dipetala Hook. & Arn. |
----- |
two-petal ash |
B |
6 |
| Fraxinus greggii A. Gray |
----- |
Gregg ash |
B |
6 |
| Fraxinus latifolia Benth. |
----- |
Oregon ash |
B |
4 |
| Fraxinus nigra Marsh. |
----- |
black ash |
B |
4 |
| Fraxinus pennsylvanica Marsh. |
----- |
green ash |
B |
4 |
| Fraxinus profunda (Bush) Bush |
----- |
pumpkin ash |
B |
7 |
| Fraxinus quadrangulata Michx. |
----- |
blue ash |
B |
4 |
| Fraxinus texensis (A. Gray) Sarg. |
----- |
Texas ash |
B |
6 |
| Fraxinus velutina Torr. |
----- |
velvet ash |
B |
6 |
| Fremontodendron californicum (Torr.) Cov. |
----- |
California fremontia |
B |
6 |
| Garrya elliptica Dougl. |
----- |
wavyleaf silktassel |
C |
6 |
| Gleditsia aquatica Marsh. |
----- |
waterlocust |
C |
7 |
| Gleditsia triacanthos L. |
----- |
honeylocust |
B |
4 |
| Gordonia lasianthus (L.) Ellis |
----- |
loblolly-bay |
C |
7 |
| Guaiacum angustifolium Engelm. |
----- |
Texas lignumvitae |
C |
6 |
| Gymnocladus dioicus (L.) K. Koch |
----- |
Kentucky coffeetree |
C |
7 |
| Halesia carolina L. |
----- |
Carolina silverbell |
C |
7 |
| Halesia diptera Ellis |
----- |
two-wing silverbell |
C |
7 |
| Halesia parviflora Michx. |
Halesia carolina L. |
little silverbell |
C |
7 |
| Hamamelis virginiana L. |
----- |
witch-hazel |
C |
7 |
| Hamelia patens Jacq. |
----- |
scarletbush |
C |
8 |
| Helietta parvifolia (A. Gray) Benth. |
----- |
barreta |
C |
6 |
| Holacantha emoryi A. Gray |
Castela emoryi (Gray) Moran & Felger |
holacantha |
B |
6 |
| Ilex ambigua (Michx.) Torr. |
----- |
Carolina holly |
C |
7 |
| Ilex amelanchier M.A. Curt. |
----- |
sarvis holly |
C |
7 |
| Ilex cassine L. |
----- |
dahoon |
C |
7 |
| Ilex coriacea (Pursh) Chapm. |
----- |
large gallberry |
C |
7 |
| Ilex decidua Walt. |
----- |
possumhaw |
C |
7 |
| Ilex laevigata (Pursh) Gray |
----- |
smooth winterberry |
C |
7 |
| Ilex longipes Chapm. |
----- |
Georgia holly |
C |
8 |
| Ilex montana Torr. & Gray |
----- |
mountain winterberry |
C |
7 |
| Ilex myrtifolia Walt. |
----- |
myrtle dahoon |
C |
7 |
| Ilex opaca Ait. |
----- |
American holly |
B |
4 |
| Ilex verticillata (L.) Gray |
----- |
common winterberry |
B |
7 |
| Ilex vomitoria Ait. |
----- |
yaupon |
C |
7 |
| Illicium floridanum Ellis |
----- |
Florida anise-tree |
C |
7 |
| Juglans californica S. Wats. |
----- |
California walnut |
B |
6 |
| Juglans cinerea L. |
----- |
butternut |
B |
4 |
| Juglans major (Torr.) Heller |
----- |
Arizona walnut |
B |
6 |
| Juglans microcarpa Berlandier |
----- |
little walnut |
B |
6 |
| Juglans nigra L. |
----- |
black walnut |
B |
4 |
| Juniperus ashei Buchholz |
----- |
Ashe juniper |
A |
4 |
| Juniperus californica Carr. |
----- |
California juniper |
A |
4 |
| Juniperus communis L. |
----- |
common juniper |
A, D |
4, 5 |
| Juniperus deppeana Steud. |
----- |
alligator juniper |
A |
4 |
| Juniperus erythrocarpa Cory |
Juniperus coahuilensis (Martínez) Gaussen ex R.P. Adams |
redberry juniper |
C |
9 |
| Juniperus flaccida Schlecht. |
----- |
drooping juniper |
A |
4 |
| Juniperus horizontalis Moench |
----- |
creeping juniper |
A, D |
4, 5 |
| Juniperus monosperma (Engelm.) Sarg. |
----- |
one-seed juniper |
A |
4 |
| Juniperus occidentalis Hook. |
----- |
western juniper |
A |
4 |
| Juniperus osteosperma (Torr.) Little |
----- |
Utah juniper |
A |
4 |
| Juniperus pinchotii Sudw. |
----- |
Pinchot juniper |
A |
4 |
| Juniperus scopulorum Sarg. |
----- |
Rocky Mountain juniper |
A |
4 |
| Juniperus silicicola (Small) Bailey |
Juniperus virginiana var. silicicola (Small) A.E. Murray |
southern redcedar |
A |
4 |
| Juniperus virginiana L. |
----- |
eastern redcedar |
A |
4 |
| Kalmia latifolia L. |
----- |
mountain-laurel |
B |
7 |
| Koeberlinia spinosa Zucc. |
----- |
allthorn |
B |
6 |
| Laguncularia racemosa (L.) Gaertn. f. |
----- |
white-mangrove |
C |
8 |
| Larix laricina (Du Roi) K. Koch |
----- |
tamarack |
A, D |
4, 5 |
| Larix lyallii Parl. |
----- |
subalpine larch |
A |
4 |
| Larix occidentalis Nutt. |
----- |
western larch |
A |
4 |
| Larrea divaricata Cav. |
Larrea tridentata (Sessé & Moc. ex DC.) Coville |
creosote bush |
B |
10 |
| Leitneria floridana Chapm. |
----- |
corkwood |
C |
7 |
| Leucaena pulverulenta (Schlecht.) Benth. |
----- |
great leadtree |
C |
6 |
| Leucaena retusa Benth. |
----- |
littleleaf leadtree |
C |
6 |
| Libocedrus decurrens Torr. |
Calocedrus decurrens (Torr.) Florin |
incense-cedar |
A |
4 |
| Liquidambar styraciflua L. |
----- |
sweetgum |
B |
4 |
| Liriodendron tulipifera L. |
----- |
yellow-poplar |
B |
4 |
| Lithocarpus densiflorus (Hook. & Arn.) Rehd. |
----- |
tanoak |
B |
4 |
| Lyonia ferruginea Nutt. |
----- |
tree lyonia |
B |
7 |
| Lysiloma microphylla Benth. |
Lysiloma divaricatum (Jacq.) J.F. Macbr. |
littleleaf lysiloma |
C |
6 |
| Maclura pomifera (Raf.) Schneid. |
----- |
Osage-orange |
B |
4 |
| Magnolia acuminata L. |
----- |
cucumbertree |
B |
4 |
| Magnolia ashei Weatherby |
----- |
Ashe magnolia |
C |
7 |
| Magnolia fraseri Walt. |
----- |
Fraser magnolia |
C |
7 |
| Magnolia grandiflora L. |
----- |
southern magnolia |
B |
4 |
| Magnolia macrophylla Michx. |
----- |
bigleaf magnolia |
C |
7 |
| Magnolia pyramidata Bartr. |
----- |
pyramid magnolia |
C |
7 |
| Magnolia tripetala L. |
----- |
umbrella magnolia |
C |
7 |
| Malus angustifolia (Ait.) Michx. |
----- |
southern crab apple |
C |
7 |
| Malus coronaria (L.) Mill. |
----- |
sweet crab apple |
C |
7 |
| Malus diversifolia (Bong.) Roem. |
Malus fusca (Raf.) C.K. Schneid. |
Oregon crab apple |
B, D |
5, 6 |
| Malus ioensis (Wood) Britton |
----- |
prairie crab apple |
C |
7 |
| Morus microphylla Buckl. |
----- |
Texas mulberry |
B |
6 |
| Morus rubra L. |
----- |
red mulberry |
B |
4 |
| Myrcianthes fragrans (Sw.) McVaugh |
----- |
twinberry stopper |
C |
8 |
| Myrica californica Cham. |
Morella californica (Cham.) Wilbur |
Pacific bayberry |
C |
6 |
| Myrica cerifera L. |
Morella cerifera (L.) Small. |
southern bayberry |
C |
7 |
| Myrica heterophylla Raf. |
Morella caroliniensis (Mill.) Small |
evergreen bayberry |
B |
7 |
| Myrica inodora Bartr. |
Morella inodora (Bartram) Small |
odorless bayberry |
B |
7 |
| Myrica pensylvanica Loisel. |
Morella pensylvanica (Mirb.) Kartesz |
northern bayberry |
B |
7 |
| Nolina bigelovii (Torr.) S. Wats. |
----- |
Bigelow nolina |
B |
6 |
| Nyssa aquatica L. |
----- |
water tupelo |
B |
4 |
| Nyssa ogeche Bartr. |
----- |
Ogeechee tupelo |
B |
4 |
| Nyssa sylvatica Marsh. |
----- |
black tupelo; blackgum |
B |
4 |
| Olneya tesota A. Gray |
----- |
tesota |
B |
6 |
| Opuntia fulgida Engelm. |
Cylindropuntia fulgida (Engelm.) F.M. Knuth |
jumping cholla |
B |
6 |
| Ostrya knowltonii Cov. |
----- |
Knowlton hophornbeam |
B |
6 |
| Ostrya virginiana (Mill.) K. Koch |
----- |
eastern hophornbeam |
B |
4 |
| Oxydendrum arboreum (L.) DC. |
----- |
sourwood |
C |
7 |
| Persea borbonia (L.) Spreng. |
----- |
redbay |
C |
7 |
| Photinia arbutifolia Lindl. |
Heteromeles arbutifolia (Lindl.) M. Roem. |
Christmas-berry |
C |
6 |
| Picea engelmannii Parry |
----- |
Engelmann spruce |
A |
4 |
| Picea glauca (Moench) Voss |
----- |
white spruce |
A, D |
4, 5 |
| Picea mariana (Mill.) B.S.P. |
----- |
black spruce |
A, D |
4, 5 |
| Picea pungens Engelm. |
----- |
blue spruce |
A |
4 |
| Picea rubens Sarg. |
----- |
red spruce |
A |
4 |
| Picea sitchensis (Bong.) Carr. |
----- |
Sitka spruce |
A, D |
4, 5 |
| Pinckneya pubens Michx. |
Pinckneya bracteata (Bartram) Raf. |
pinckneya |
C |
7 |
| Pinus albicaulis Engelm. |
----- |
whitebark pine |
A |
4 |
| Pinus aristata Engelm. |
----- |
Rocky Mountain bristlecone pine |
A |
4 |
| Pinus attenuata Lemm. |
----- |
knobcone pine |
A |
4 |
| Pinus banksiana Lamb. |
----- |
jack pine |
A |
4 |
| Pinus cembroides Zucc. |
----- |
Mexican pinyon |
A |
4 |
| Pinus clausa (Chapm.) Vasey |
----- |
sand pine |
A |
4 |
| Pinus contorta Dougl. |
----- |
lodgepole pine |
A, D |
4, 5 |
| Pinus cooperi C.E. Blanco |
Pinus arizonica var. cooperi (C.E. Blanco) Farjon |
Cooper pine |
A |
3 |
| Pinus coulteri D. Don |
----- |
Coulter pine |
A |
4 |
| Pinus durangensis Martínez |
----- |
Durango pine |
A |
3 |
| Pinus echinata Mill. |
----- |
shortleaf pine |
A |
4 |
| Pinus edulis Engelm. |
----- |
pinyon |
A |
4 |
| Pinus elliottii Engelm. |
----- |
slash pine |
A |
4 |
| Pinus engelmannii Carr. |
----- |
Apache pine |
A |
4 |
| Pinus flexilis James |
----- |
limber pine |
A |
4 |
| Pinus glabra Walt. |
----- |
spruce pine |
A |
4 |
| Pinus jeffreyi Grev. & Balf. |
----- |
Jeffrey pine |
A |
4 |
| Pinus lambertiana Dougl. |
----- |
sugar pine |
A |
4 |
| Pinus leiophylla Schiede & Deppe |
----- |
Chihuahua pine |
A |
3, 4 |
| Pinus longaeva Bailey |
----- |
Intermountain bristlecone pine |
A |
1, 4 |
| Pinus lumholtzii Robins. & Fern. |
----- |
Lumholtz pine |
A |
3 |
| Pinus monophylla Torr. & Frém. |
----- |
singleleaf pinyon |
A |
4 |
| Pinus montezumae Lamb. |
----- |
Montezuma pine |
A |
3 |
| Pinus monticola Dougl. |
----- |
western white pine |
A |
4 |
| Pinus oocarpa Schiede |
----- |
Nicaraguan pitch pine; ocote pine |
A |
3 |
| Pinus palustris Mill. |
----- |
longleaf pine |
A |
4 |
| Pinus patula Schiede & Deppe |
----- |
Mexican weeping pine |
A |
3 |
| Pinus pinceana Gord. |
----- |
Pince pinyon |
A |
3 |
| Pinus ponderosa Laws. |
----- |
ponderosa pine |
A |
4 |
| Pinus pseudostrobus Lindl. |
----- |
False Weymouth pine |
A |
3 |
| Pinus pungens Lamb. |
----- |
Table-Mountain pine |
A |
4 |
| Pinus quadrifolia Parl. |
----- |
Parry pinyon |
A |
4 |
| Pinus resinosa Ait. |
----- |
red pine |
A |
4 |
| Pinus rigida Mill. |
----- |
pitch pine |
A |
4 |
| Pinus sabiniana Dougl. |
----- |
Digger pine |
A |
4 |
| Pinus serotina Michx. |
----- |
pond pine |
A |
4 |
| Pinus strobiformis Engelm. |
----- |
southwestern white pine |
A |
4 |
| Pinus strobus L. |
----- |
eastern white pine |
A |
4 |
| Pinus taeda L. |
----- |
loblolly pine |
A |
4 |
| Pinus teocote Schiede & Deppe |
----- |
Twisted -leaves pine; Aztec pine |
A |
3 |
| Pinus virginiana Mill. |
----- |
Virginia pine |
A |
4 |
| Pistacia texana Swingle |
Pistacia mexicana Kunth |
Texas pistache |
C |
6 |
| Pithecellobium flexicaule (Benth.) Coult. |
Ebenopsis ebano (Berland) Barneby & J.W. Grimes |
ebony blackbead |
C |
6 |
| Pithecellobium pallens (Benth.) Standl. |
Havardia pallens (Benth.) Britton & Rose |
huajillo |
C |
6 |
| Planera aquatica J.F. Gmel. |
----- |
planertree |
C |
7 |
| Platanus occidentalis L. |
----- |
American sycamore |
B |
4 |
| Platanus racemosa Nutt. |
----- |
California sycamore |
C |
6 |
| Platanus wrightii S. Wats. |
----- |
Arizona sycamore |
C |
6 |
| Populus angustifolia James |
----- |
narrowleaf cottonwood |
C |
6 |
| Populus arizonica Sarg. |
Populus fremontii ssp. fremontii in part / Populus fremontii ssp. mesetae Eckenw. |
Arizona cottonwood |
C |
6 |
| Populus balsamifera L. |
----- |
balsam poplar |
B, D |
4, 5 |
| Populus deltoides Bartr. |
----- |
eastern cottonwood |
C |
4 |
| Populus fremontii S. Wats. |
----- |
Fremont cottonwood |
B |
4 |
| Populus grandidentata Michx. |
----- |
bigtooth aspen |
B |
4 |
| Populus heterophylla L. |
----- |
swamp cottonwood |
B |
4 |
| Populus tremuloides Michx. |
----- |
quaking aspen |
B, D |
4, 5 |
| Populus trichocarpa Torr. & Gray |
----- |
black cottonwood |
B, D |
4, 5 |
| Prosopis pubescens Benth. |
----- |
screwbean mesquite |
B |
6 |
| Prunus alleghaniensis Porter |
----- |
Allegheny plum |
C |
7 |
| Prunus americana Marsh. |
----- |
American plum |
C |
6, 7 |
| Prunus caroliniana (Mill.) Ait. |
----- |
Carolina laurelcherry |
C |
7 |
| Prunus emarginata Dougl. |
----- |
bitter cherry |
C |
6 |
| Prunus fremontii S. Wats. |
----- |
desert apricot |
C |
6 |
| Prunus hortulana Bailey |
----- |
hortulan plum |
C |
7 |
| Prunus ilicifolia (Nutt.) D. Dietr. |
----- |
hollyleaf cherry |
C |
6 |
| Prunus mexicana Wats. |
----- |
Mexican plum |
C |
7 |
| Prunus munsoniana Wight & Hedr. |
----- |
wildgoose plum |
C |
7 |
| Prunus nigra Ait. |
----- |
Canada plum |
C |
7 |
| Prunus pensylvanica L. f. |
----- |
pin cherry |
C |
6, 7 |
| Prunus serotina Ehrh. |
----- |
black cherry |
B |
4 |
| Prunus subcordata Benth. |
----- |
Klamath plum |
C |
6 |
| Prunus umbellata Ell. |
----- |
flatwoods plum |
C |
7 |
| Prunus virginiana L. |
----- |
common chokecherry |
C |
6, 7 |
| Pseudotsuga macrocarpa (Vasey) Mayr |
----- |
bigcone Douglas-fir |
A |
4 |
| Pseudotsuga menziesii (Mirb.) Franco |
----- |
Douglas-fir |
A |
4 |
| Ptelea crenulata Greene |
----- |
California hoptree |
C |
6 |
| Ptelea trifoliata L. |
----- |
common hoptree |
B |
6 |
| Quercus agrifolia Née |
----- |
California live oak |
B |
4 |
| Quercus alba L. |
----- |
white oak |
B |
4 |
| Quercus arizonica Sarg. |
----- |
Arizona white oak |
B |
6 |
| Quercus arkansana Sarg. |
----- |
Arkansas oak |
B |
7 |
| Quercus bicolor Willd. |
----- |
swamp white oak |
B |
4 |
| Quercus chapmanii Sarg. |
----- |
Chapman oak |
B |
7 |
| Quercus chrysolepis Liebm. |
----- |
canyon live oak |
B |
4 |
| Quercus coccinea Muenchh. |
----- |
scarlet oak |
B |
4 |
| Quercus douglasii Hook. & Arn. |
----- |
blue oak |
B |
4 |
| Quercus dunnii Kellogg |
Quercus palmeri Engelm. |
Dunn oak |
B |
6 |
| Quercus durandii Buckl. |
Quercus sinuata Walter |
Durand oak |
B |
7 |
| Quercus ellipsoidalis E.J. Hill |
----- |
northern pin oak |
B |
4 |
| Quercus emoryi Torr. |
----- |
Emory oak |
B |
4 |
| Quercus engelmannii Greene |
----- |
Engelmann oak |
B |
6 |
| Quercus falcata Michx. |
----- |
southern red oak |
B |
4 |
| Quercus gambelii Nutt. |
----- |
Gambel oak |
B |
4 |
| Quercus garryana Dougl. |
----- |
Oregon white oak |
B |
4 |
| Quercus glaucoides Mart. & Gal. |
Quercus laceyi Small |
Lacey oak |
B |
6 |
| Quercus gravesii Sudw. |
----- |
Graves oak, also Q. tardifolia C. H. Muller, lateleaf oak |
B |
6 |
| Quercus grisea Liebm. |
----- |
gray oak |
B |
6 |
| Quercus havardii Rydb. |
----- |
Havard oak |
B |
6 |
| Quercus hypoleucoides A. Camus |
----- |
silverleaf oak |
B |
6 |
| Quercus ilicifolia Wangenh. |
----- |
bear oak |
B |
7 |
| Quercus imbricaria Michx. |
----- |
shingle oak |
B |
7 |
| Quercus incana Bartr. |
----- |
bluejack oak |
B |
7 |
| Quercus kelloggii Newb. |
----- |
California black oak |
B |
4 |
| Quercus laevis Walt. |
----- |
turkey oak |
B |
7 |
| Quercus laurifolia Michx. |
----- |
laurel oak |
B |
4 |
| Quercus lobata Née |
----- |
California white oak |
B |
4 |
| Quercus lyrata Walt. |
----- |
overcup oak |
B |
4 |
| Quercus macrocarpa Michx. |
----- |
bur oak |
B |
4 |
| Quercus marilandica Muenchh. |
----- |
blackjack oak |
B |
4 |
| Quercus michauxii Nutt. |
----- |
swamp chestnut oak |
B |
4 |
| Quercus mohriana Buckl. |
----- |
Mohrs oak |
B |
6 |
| Quercus muehlenbergii Engelm. |
----- |
chinkapin oak |
B |
4 |
| Quercus myrtifolia Willd. |
----- |
myrtle oak |
B |
7 |
| Quercus nigra L. |
----- |
water oak |
B |
4 |
| Quercus nuttallii Palmer |
Quercus texana Buckley |
Nuttall oak |
B |
4 |
| Quercus oblongifolia Torr. |
----- |
Mexican blue oak |
B |
6 |
| Quercus oglethorpensis Duncan |
----- |
Oglethorpe oak |
B |
7 |
| Quercus palustris Muenchh. |
----- |
pin oak |
B |
4 |
| Quercus phellos L. |
----- |
willow oak |
B |
4 |
| Quercus prinus L. |
Quercus montana Willdenow |
chestnut oak |
B |
4 |
| Quercus pungens Liebm. |
----- |
sandpaper oak |
B |
6 |
| Quercus rubra L. |
----- |
northern red oak |
B |
4 |
| Quercus rugosa Née |
----- |
netleaf oak |
B |
6 |
| Quercus shumardii Buckl. |
----- |
Shumard oak |
B |
4 |
| Quercus stellata Wangenh. |
----- |
post oak |
B |
4 |
| Quercus toumeyi Sarg. |
----- |
Toumey oak |
B |
6 |
| Quercus turbinella Greene |
----- |
shrub live oak |
B |
6 |
| Quercus velutina Lam. |
----- |
black oak |
B |
4 |
| Quercus virginiana Mill. |
----- |
live oak |
B |
4 |
| Quercus wislizeni A. DC. |
----- |
interior live oak |
B |
6 |
| Rapanea punctata (Lam.) Lundell |
Myrsine cubana A. DC. |
Florida rapanea |
C |
8 |
| Rhamnus betulaefolia Greene |
Frangula betulifolia (Greene) Grubov |
birchleaf buckthorn |
B |
6 |
| Rhamnus californica Eschsch. |
Frangula californica (Eschsch.) A. Gray |
California buckthorn |
B |
6 |
| Rhamnus caroliniana Walt. |
Frangula caroliniana (Walter) A. Gray |
Carolina buckthorn |
C |
7 |
| Rhamnus crocea Nutt. |
----- |
hollyleaf buckthorn |
B |
6 |
| Rhamnus purshiana DC. |
Frangula purshiana (DC.) A. Gray |
cascara buckthorn |
B |
4 |
| Rhizophora mangle L. |
----- |
mangrove |
C |
4, 8 |
| Rhododendron catawbiense Michx. |
----- |
Catawba rhododendron |
C |
7 |
| Rhododendron macrophyllum D. Don |
----- |
Pacific rhododendron |
B |
6 |
| Rhododendron maximum L. |
----- |
rosebay rhododendron |
C |
7 |
| Rhus choriophylla Woot. & Standl. |
Rhus virens var. choriophylla (Wooton & Standl.) L.D. Benson |
Mearns sumac |
B |
6 |
| Rhus copallina L. |
Rhus copallinum L. |
shining sumac |
C |
7 |
| Rhus glabra L. |
----- |
smooth sumac |
B |
6, 7 |
| Rhus integrifolia (Nutt.) Benth. & Hook. f. |
----- |
lemonade sumac |
C |
6 |
| Rhus kearneyi Barkley |
----- |
Kearney sumac |
C |
6 |
| Rhus lanceolata (A. Gray) Britton |
----- |
prairie sumac |
C |
6 |
| Rhus laurina Nutt. |
Malosma laurina (Nutt.) Nutt. ex Abrams |
laurel sumac |
C |
6 |
| Rhus microphylla Engelm. |
----- |
littleleaf sumac |
B |
6 |
| Rhus ovata S. Wats. |
----- |
sugar sumac |
B |
6 |
| Rhus typhina L. |
----- |
staghorn sumac |
C |
7 |
| Robinia neomexicana A. Gray |
----- |
New Mexican locust |
B |
6 |
| Robinia pseudoacacia L. |
----- |
black locust |
B |
4 |
| Robinia viscosa Vent. |
----- |
clammy locust |
C |
7 |
| Sabal mexicana Mart. |
----- |
Mexican palmetto |
C |
6 |
| Sabal minor (Jacq.) Pers. |
----- |
dwarf palmetto |
C |
7 |
| Sabal palmetto (Walt.) Lodd. |
----- |
cabbage palmetto |
B |
4 |
| Salix alaxensis (Anderss.) Cov. |
----- |
feltleaf willow |
B, D |
5, 6 |
| Salix amygdaloides Anderss. |
----- |
peachleaf willow |
C |
4 |
| Salix arbusculoides Anderss. |
----- |
peachleaf willow |
B, D |
5, 6 |
| Salix bebbiana Sarg. |
----- |
Bebb willow |
B, D |
5, 6, 7 |
| Salix bonplandiana H.B.K. |
----- |
Bonpland willow |
C |
6 |
| Salix caroliniana Michx. |
----- |
Coastal Plain willow |
C |
7 |
| Salix discolor Mühl. |
----- |
pussy willow |
C |
6, 7 |
| Salix exigua Nutt. |
Salix exigua Nutt. / Salix interior Rowlee |
coyote willow |
C |
6, 7 |
| Salix floridana Chapm. |
----- |
Florida willow |
C |
7 |
| Salix fluviatilis Nutt. |
Salix columbiana (Dorn) Argus |
river willow |
C |
6 |
| Salix geyeriana Anderss. |
----- |
Geyer willow |
C |
6 |
| Salix hindsiana Benth. |
Salix exigua var. hindsiana (Benth.) Dorn |
Hinds willow |
C |
6 |
| Salix hookeriana Barratt |
----- |
Hooker willow |
B, D |
5, 6 |
| Salix laevigata Bebb |
----- |
red willow |
C |
6 |
| Salix lasiandra Benth. |
----- |
Pacific willow |
B, D |
5, 6 |
| Salix lasiolepis Benth. |
----- |
arroyo willow |
C |
6 |
| Salix lucida Mühl. |
----- |
shining willow |
C |
7 |
| Salix mackenzieana (Hook.) Barratt |
Salix prolixa Andersson |
Mackenzie willow |
C |
6 |
| Salix nigra Marsh. |
Salix nigra Marshall / Salix goodingii C.R. Ball |
black willow |
C |
4, 6 |
| Salix pellita Anderss. |
----- |
satiny willow |
C |
7 |
| Salix petiolaris J.E. Sm. |
----- |
meadow willow |
C |
6, 7 |
| Salix pyrifolia Anderss. |
----- |
balsam willow |
C |
7 |
| Salix scouleriana Barratt |
----- |
Scouler willow |
B, D |
5, 6 |
| Salix sericea Marsh. |
----- |
silky willow |
C |
7 |
| Salix sessilifolia Nutt. |
----- |
northwest willow |
C |
6 |
| Salix sitchensis Sanson |
----- |
Sitka willow |
B, D |
5, 6 |
| Salix taxifolia H.B.K. |
----- |
yewleaf willow |
C |
6 |
| Salix tracyi Ball |
----- |
Tracy willow |
C |
6 |
| Sambucus callicarpa Greene |
Sambucus racemosa var. racemosa |
Pacific red elder |
B, D |
5, 6 |
| Sambucus canadensis L. |
Sambucus nigra ssp. canadensis (L.) R. Bolli |
American elder |
C |
7 |
| Sambucus glauca Nutt. |
Sambucus nigra ssp. cerulea (Raf.) R. Bolli in part |
blueberry elder |
C |
6 |
| Sambucus melanocarpa A. Gray |
Sambucus racemosa var. melanocarpa (A. Gray) McMinn |
blackbead elder |
C |
6 |
| Sambucus mexicana Presl. |
Sambucus nigra ssp. canadensis (L.) R. Bolli in part / Sambucus nigra ssp. cerulea in part |
Mexican elder |
B |
6 |
| Sambucus velutina Durand & Hilgard |
Sambucus nigra ssp. cerulea (Raf.) R. Bolli in part |
velvet elder |
C |
6 |
| Sapindus drummondii Hook. & Arn. |
Sapindus saponaria var. drummondii (Hook. & Arn.) L.D. Benson |
western soapberry |
C |
6, 7 |
| Sapium biloculare (S. Wats.) Pax |
Sebastiana bilocularis S. Watson |
jumping-bean sapium |
B |
6 |
| Sassafras albidum (Nutt.) Nees |
----- |
sassafras |
B |
4 |
| Sequoia sempervirens (D. Don) Endl. |
----- |
redwood |
A |
4 |
| Serenoa repens (Bartr.) Small |
----- |
saw-palmetto |
C |
7 |
| Shepherdia argentea (Pursh) Nutt. |
----- |
silver buffaloberry |
B |
6, 7 |
| Solanum erianthum D. Don |
----- |
mullein nightshade |
C |
7, 8 |
| Sophora affinis Torr. & Gray |
Styphnolobium affine (Torr. & A. Gray) Walp. |
Texas sophora |
C |
7 |
| Sophora secundiflora (Ortega) Lag. |
----- |
mescalbean |
C |
6 |
| Sorbus americana Marsh. |
----- |
American mountain-ash |
C |
7 |
| Sorbus decora (Sarg.) Schneid. |
----- |
showy mountain-ash |
C |
7 |
| Sorbus scopulina Greene |
----- |
Greene mountain-ash |
B, D |
5, 6 |
| Sorbus sitchensis Roem. |
----- |
Sitka mountain-ash |
B, D |
5, 6 |
| Staphylea bolanderi A. Gray |
----- |
Sierra bladdernut |
C |
6 |
| Staphylea trifolia L. |
----- |
American bladdernut |
C |
7 |
| Stewartia malacodendron L. |
----- |
Virginia stewartia |
C |
7 |
| Stewartia ovata (Cav.) Weatherby |
----- |
mountain stewartia |
C |
7 |
| Styrax americana Lam. |
Styrax americanus Lam. |
American snowbell |
C |
7 |
| Styrax grandifolia Ait. |
Styrax grandifolius Aiton |
bigleaf snowbell |
C |
7 |
| Styrax platanifolia Engelm. |
Styrax platanifolius Engelm. ex Torr. |
sycamore-leaf snowbell |
C |
7 |
| Symplocos tinctoria (L.) L'Hér. |
----- |
common sweetleaf |
C |
7 |
| Taxodium distichum (L.) Rich. |
----- |
baldcypress |
A |
4 |
| Taxodium mucronatum Ten. |
Taxodium distichum var. mexicanum Gordon |
Montezuma baldcypress |
A |
4 |
| Taxus brevifolia Nutt. |
----- |
Pacific yew |
A, D |
4, 5 |
| Taxus canadensis Marsh. |
----- |
Canada yew |
A |
4 |
| Thuja occidentalis L. |
----- |
northern white-cedar |
A |
4 |
| Thuja plicata Donn |
----- |
western redcedar |
A, D |
4, 5 |
| Tilia americana L. |
Tilia americana var. americana |
American basswood |
B |
4 |
| Tilia caroliniana Mill. |
Tilia americana var. caroliniana (P. Mill.) Castigl. |
Carolina basswood |
C |
7 |
| Tilia heterophylla Vent. |
Tilia americana var. heterophylla (Vent.) Loud. |
white basswood |
B |
4 |
| Toxicodendron vernix (L.) Kuntze |
----- |
poison-sumac |
C |
7 |
| Trema micrantha (L.) Blume |
----- |
Florida trema |
C |
8 |
| Tsuga canadensis (L.) Carr. |
----- |
eastern hemlock |
A |
4 |
| Tsuga caroliniana Engelm. |
----- |
Carolina hemlock |
A |
4 |
| Tsuga heterophylla (Raf.) Sarg. |
----- |
western hemlock |
A, D |
4, 5 |
| Tsuga mertensiana (Bong.) Carr. |
----- |
mountain hemlock |
A, D |
4, 5 |
| Ulmus alata Michx. |
----- |
winged elm |
B |
4 |
| Ulmus americana L. |
----- |
American elm |
B |
4 |
| Ulmus crassifolia Nutt. |
----- |
cedar elm |
B |
4 |
| Ulmus rubra Mühl. |
----- |
slippery elm |
B |
4 |
| Ulmus serotina Sarg. |
----- |
September elm |
B |
4 |
| Ulmus thomasii Sarg. |
----- |
rock elm |
B |
4 |
| Umbellularia californica (Hook. & Arn.) Nutt. |
----- |
California-laurel |
B |
4 |
| Ungnadia speciosa Endl. |
----- |
Mexican-buckeye |
C |
6 |
| Vaccinium arboreum Marsh. |
----- |
tree sparkleberry |
C |
7 |
| Vauquelinia californica (Torr.) Sarg. |
----- |
Torrey vauquelinia |
B |
6 |
| Viburnum lentago L. |
----- |
nannyberry |
C |
6, 7 |
| Viburnum nudum L. |
----- |
possumhaw viburnum |
C |
7 |
| Viburnum obovatum Walt. |
----- |
Walter viburnum |
C |
7 |
| Viburnum prunifolium L. |
----- |
blackhaw |
C |
7 |
| Viburnum rufidulum Raf. |
----- |
rusty blackhaw |
C |
7 |
| Viburnum trilobum Marsh. |
Viburnum opulus var. americanum Aiton |
American cranberrybush |
C |
6, 7 |
| Ximenia americana L. |
----- |
tallowwood |
C |
8 |
| Yucca aloifolia L. |
----- |
aloe yucca |
C |
7 |
| Yucca brevifolia Engelm. |
----- |
Joshua-tree |
B |
6 |
| Yucca carnerosana (Trel.) McKelvey |
Yucca carnerosana (Trel.) McKelvey / Yucca faxoniana (Trel.) Sarg. |
Carneros yucca |
B |
6 |
| Yucca elata Engelm. |
----- |
soaptree yucca |
B |
6 |
| Yucca faxoniana Sarg. |
----- |
Faxon yucca |
B |
6 |
| Yucca gloriosa L. |
----- |
moundlily yucca |
C |
7 |
| Yucca mohavensis Sarg. |
Yucca schidigera Ortgies |
Mohave yucca |
B |
6 |
| Yucca rostrata Engelm. |
----- |
beaked yucca |
B |
6 |
| Yucca schottii Engelm. |
----- |
Schotts yucca |
B |
6 |
| Yucca torreyi Shafer |
Yucca treculeana Carrière |
Torrey yucca |
B |
6 |
| Yucca treculeana Carr. |
----- |
Trecul yucca |
B |
6 |
| Zanthoxylum americanum Mill |
----- |
common prickly-ash |
C |
7 |
| Zanthoxylum clava-herculis L. |
----- |
Hercules-club |
C |
7 |
| Zanthoxylum fagara (L.) Sarg. |
----- |
lime prickly-ash |
C |
7, 8 |
| Zanthoxylum hirsutum Buckl. |
----- |
Texas Hercules-club |
C |
7 |
U.S. Department of the Interior |
U.S. Geological Survey