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Hymenoxys cooperi
Also called Cooper's Bitterweed
Cooper's rubberweed is a biennial or short-lived perennial wildflower in the daisy family, native to dry, rocky ground in the southwestern US and Great Basin. It needs full sun, excellent drainage and very little water to thrive.
Hymenoxys cooperi is a species of flowering plant in the daisy family known by the common name Cooper's rubberweed. It is native to the southwestern United States and Great Basin, 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.
Pinaleno Mountain rubberweed · South American rubberweed · Colorado Rubberweed · Bigelow's rubberweed · East View rubberweed · Brandegee's four-nerve-daisy · Hymenoxys cabrerae · Graylocks Four Nerve Daisy · Intermountain rubberweed · Owl's-claws · Hymenoxys insignis · Jame's rubberweed
Text excerpted from the Wikipedia article Hymenoxys cooperi by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
