Hymenoxys helenioides is a North American species of flowering plant in the daisy family known by the common name intermountain rubberweed. It is native to Arizona, Utah, Colorado, and New Mexico in the western United States.Biota of North America Program 2014 distribution map
Hymenoxys helenioides is a perennial herb up to tall. One plant generally produces as many as 50 flower heads. Each head has 10–16 ray flowers and 50–150 disc flowers.Flora of North America, Hymenoxys helenioides (Rydberg) Cockerell, 1904. Intermountain rubberweed
Taxonomy In 1904 Hymenoxys helenioides was scientifically described and named by Theodore D. A. Cockerell. It is classified in the genus Hymenoxys within the family Asteraceae. It has no subspecies and has three heterotypic synonyms.
Table of Synonyms Name Year Actinea helenioides 1931 Dugaldia helenioides 1909 Picradenia helenioides 1901
Range According to Plants of the World Online, intermountain rubberweed is native to just three western states; Colorado, Utah, and Arizona. However, according to the Natural Resources Conservation Service it also grows in San Juan County, New Mexico and Clark County, Nevada, though nowhere else in these states. The NRCS also records it in just Apache County, Arizona.
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