|Scientific Name||Asclepias speciosa||USDA PLANTS Symbol||ASSP|
|Common Name||Showy Milkweed||ITIS Taxonomic Serial No.||30304|
Life zones and habitat: Plains and foothills (3400 to 8400 ft); moist soils of prairies, roadsides, waste areas, lake margins.
Plant: Erect perennial, 16 to 48 inches tall; slightly to densely hairy stems with milky sap.
Leaves: Stem leaves opposite, petiolate, oblong-lanceolate to ovate-oblong, 4 to 8 inches long and up to 4 inches across; with transverse veins.
Inflorescence: Several umbels on peduncles 1 to 3 inches long; 5 greenish sepals often hidden beneath pink to purplish-red petals that are about 1/2-inch long; 5 pale pink to white hoods spreading in a star pattern, each 1/3 to 1/2-inch long; white, sickle-shaped horns, shorter than hoods, arching over anther head. See Orbis Environmental Consulting's website for a discussion of milkweed flower morphology.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, Burke Museum-Washington University and Kansas Wildflowers and Grasses.
|BONAP Distribution Map
Map Color Key
© Tom Lebsack 2022
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County