Todd Esque
Trent M Draper
2021
<div class="div0"><div class="row ArticleContentRow"><p><i>Helianthus devernii</i><span> </span>T.M.Draper is described as a new endemic species from two small desert spring populations found within Red Rock Canyon National Conservation Area, Clark County, NV. Morphological data and nuclear ribosomal ITS marker data place it in section<span> </span><i>Ciliares</i><span> </span>series<span> </span><i>Pumili</i>. Furthermore, the molecular data allies it most closely to<span> </span><i>H. pumilus</i><span> </span>Nutt.<span> </span><i>Helianthus devernii</i><span> </span>differs from<span> </span><i>H. pumilus</i><span> </span>by its sessile one nerved opposite and alternate leaves, glabrous glaucous stems, and overall smaller heads. The two known populations of<span> </span><i>H. devernii</i><span> </span>of approximately 400 individuals occur near the Las Vegas Valley and are threatened by heavy recreational use and exotic plants and animals. A key to the species of<span> </span><i>Helianthus</i><span> </span>of Nevada is presented.</p></div></div>
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10.3120/0024-9637-68.1.52
en
BioOne
A new species of Helianthus (Asteracae) from Clark County, Nevada
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