A new species of Helianthus (Asteracae) from Clark County, Nevada

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Helianthus devernii 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 Ciliares series Pumili. Furthermore, the molecular data allies it most closely to H. pumilus Nutt. Helianthus devernii differs from H. pumilus by its sessile one nerved opposite and alternate leaves, glabrous glaucous stems, and overall smaller heads. The two known populations of H. devernii 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 Helianthus of Nevada is presented.

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Publication type Article
Publication Subtype Journal Article
Title A new species of Helianthus (Asteracae) from Clark County, Nevada
Series title Madroño
DOI 10.3120/0024-9637-68.1.52
Volume 68
Issue 1
Year Published 2021
Language English
Publisher BioOne
Contributing office(s) Western Ecological Research Center
Description 5 p.
First page 52
Last page 56
Country United States
State Nevada
County Clark County
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