Calochortus westonii, common name Shirley Meadows star-tulip, is a rare endemic plant known only from the Greenhorn Mountains range of the southern Sierra Nevada, within Kern and Tulare Counties, California.
It grows in open locations in meadows and woodlands at elevations of . It is vulnerable due to habitat loss from logging, development of ski resort, and fuel breaks.
Description Calochortus westonii is bulb-forming herb attaining a height of up to . Leaves are basal, persistent, and linear, up to long.
Sepals are green, up to long. Petals are lanceolate, up to long, with long flexible hairs along the margins.Ownbey, Marion S. 1940. A monograph of the genus Calochortus. Annals of the Missouri Botanical Garden 27: 371–560.Ownbey, Marion 1969. Calochortus. University of Washington Publications in Botany 17: 765–779.Eastwood, Alice. 1931. New species of plants from western North America. Proceedings of the California Academy of Sciences, Series 4, 20(5):135-160.Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley. Flowers bloom from May to June and petals are white or blue in color.
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