''Hymenoxys cooperi'' is a species of flowering plant in the
daisy family
The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...
known by the common name Cooper's rubberweed. It is native to the southwestern United States and
Great Basin
The Great Basin is the largest area of contiguous endorheic basin, endorheic watersheds, those with no outlets, in North America. It spans nearly all of Nevada, much of Utah, and portions of California, Idaho, Oregon, Wyoming, and Baja California ...
, where it grows in rocky soils in arid regions from southern California to New Mexico, north as far as Idaho and Oregon.
''Hymenoxys cooperi'' is a biennial or perennial herb with a branching stem growing erect to heights between 15 and 90 centimeters (6-36 inches or 0.5-3.0 feet). It produces narrow, pointed leaves with two lateral lobes that form a trident shape. The foliage and stem are glandular and waxy, usually with a thin coat of light-colored hairs. The daisy-like
flower head is a cup of fused
phyllaries with 30–150 tiny yellow-orange disc florets surrounded by 9–14 bright yellow ray florets, each ray about a centimeter (0.4 inches) long.
Flora of North America, ''Hymenoxys cooperi'' (A. Gray) Cockerell, 1904. Cooper’s rubberweed or bitterweed
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References
External links
Jepson Manual Treatment, University of CaliforniaUnited States Department of Agriculture Plants Profile
Calphotos Photo gallery, University of CaliforniaPhoto of herbarium specimen at Missouri Botanical Garden, collected in Utah or Arizona in 1877
cooperi
Flora of the Western United States
Plants described in 1861
Flora without expected TNC conservation status
{{Asteroideae-stub