Rare Plant Field Guide

Table of Contents Home Introduction Acknowledgments Definitions Master Plant List USFS List BLM List Other Agencies Glossary References Plant Survey Form HELP! NDIS Home CNHP Home

Photo Copyright © 1999 by J. Locklear Asclepiadaceae (Milkweed Family) Look Alikes: A. pumila has flowers that are whitish and bloom from July into September, and filiform leaves. A. involucrata has larger leaves that are uniformly linear to lanceolate, and longer hoods (3-4 mm). Flowering/Fruiting Period: Late April-May/June-early July. Habitat: Shortgrass prairie, often on sandstone-derived soils and gravelly or rocky slopes. Elev. 4000-6500 ft. Photo Copyright © 1999 by S. Spackman Distribution: Arizona, New Mexico, Wyoming, Oklahoma and E Colorado (Baca, Bent, Cheyenne, Denver, Fremont, Huerfano, Jefferson, Kit Carson, Las Animas, Otero, Prowers, Pueblo, Sedgewick, Washington and Weld Cos.). References: Great Plains Flora Association 1986; Locklear 1991 and 1996. Please send comments to: Colorado Natural Heritage Program 254 General Services Building, Colorado State University · Fort Collins, CO 80523 · (970) 491-2992