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Asclepias uncialis
Asclepias uncialis is a species of flowering plant in the dogbane family known by the common name wheel milkweed. It is native to the western United States. Two subspecies are sometimes described, with ssp. ruthiae containing three plants which are sometimes described as separate species, Asclepias ruthiae, A. eastwoodiana, and A. sanjuanensis.
This species is a small perennial herb with stems just a few inches long. Like most other milkweeds, the stems contain a milky sap. There are two different leaf types. The lower leaves are lance-shaped to oval, and the upper leaves are narrower. Flowers occur at the ends of the stems in clusters of up to 12. They are pinkish purple in color. The fruit is a follicle containing seeds which each have a tuft of silky hairs up to an inch long.
Cartwheels · Cartwheels · Whitestem milkweed · Asclepias alpestris · Asclepias amabilis · Asclepias ameliae · Clasping milkweed · Arizona milkweed · Asclepias apocynifolia · Sand milkweed · Spider milkweed · Asclepias atroviolacea
Text excerpted from the Wikipedia article Asclepias uncialis by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
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.
