Rare Plant Field Guide

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Onagraceae (Evening-Primrose Family) Look Alikes: Differs from other Oenothera species in Colorado in flower color, and in flower size (petals over 4 cm long). Flowering/Fruiting Period: Flowers in September. Habitat: Talus slopes and streambanks, in rocky soils derived from Tertiary volcanics, in mixed conifer forest. Elev. 8760 ft. Photo Copyright © 1999 by S. Spackman Distribution: Colorado endemic. Mineral Co. near Wolf Creek Pass. Entire population/species was eliminated by road construction in 1981 and 1982. References: Wagner and Mill 1984. Please send comments to: Colorado Natural Heritage Program 254 General Services Building, Colorado State University · Fort Collins, CO 80523 · (970) 491-2992