Asclepias subverticillata
(Horsetail Milkweed)
Asclepias subverticillata, John Martin Reservoir State Park, Bent Co. 0075
Asclepias subverticillata, John Martin Reservoir State Park, Bent Co. 0091
Asclepias subverticillata, John Martin Reservoir State Park, Bent Co. 0079
Asclepias subverticillata, John Martin Reservoir State Park, Bent Co. 0085
| Scientific Name | Asclepias subverticillata | USDA PLANTS Symbol | ASSU2 |
| Common Name | Horsetail Milkweed, Whorled Milkweed | ITIS Taxonomic Serial No. | 30308 |
| Family | Apocynaceae (Dogbane) | SEINet Reference |
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| Description |
Life zones and habitat: Plains to montane (3400 to 8600 ft.); sandy or rocky soils; open areas in woodlands, grasslands, and disturbed areas. Plant: Perennial with numerous erect or ascending stems 6 to 40 inches tall. Leaves: Whorled with 3 or 4 leaves per node; blades are linear, 3/4 to 4-3/4 inches long 3/8 to 1-5/8 inches wide; on very short petioles. Inflorescence: Small umbels at the upper nodes, 3/4 to 2-1/2 inches across on peduncles 3/8 to 2 inches long; small flowers with petals that are white to cream (or even greenish-purple), the erect hoods are white to yellowish, less than 1/10-inch long; horns are longer than hoods. Bloom Period: June to August. References: "Flora of Colorado" by Jennifer Ackerfield and SEINet. |
BONAP Distribution Map Map Color Key |
Colorado Status: Native |
© Tom Lebsack 2024
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County