Asclepias subverticillata (A. Gray) Vail. Horsetail Milkweed, Poison Milkweed. Phen: (Apr-) May-Oct; (Jun-) Jul-Dec. Hab: Prairies, disturbed areas. Dist: Native from w. KS, s. WY, s. ID south to w. TX, NM, AZ, and s. Mexico; reported scattered occurrences eastwards of that area are either definitely introductions as waifs (MO), possibly so (nc. TX, se. TX, s. TX), or possibly misidentifications.
Origin/Endemic status: Native
Synonymy ⓘ: = FNA14, GrPl, K3, Mex, Mo2, Tx, Woodson (1954); = n/a – C, F
Links to other floras: = Asclepias subverticillata - FNA14
Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: FACU
- Great Plains: FACU
- Midwest: FACU
Heliophily ⓘ: 9
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© Alan Cressler: Asclepias subverticillata, Colorado River, Lower Glenwood Canyon, near Glenwood Springs, Garfield County, Colorado 1 by Alan Cressler source | Original Image ⭷
© Alan Cressler: Asclepias subverticillata, San Rafael Swell, BLM Lands, Emery County, Utah 2 by Alan Cressler source
© Alan Cressler: Asclepias subverticillata, Colorado River, Lower Glenwood Canyon, near Glenwood Springs, Garfield County, Colorado 2 by Alan Cressler source
© Alan Cressler: Asclepias subverticillata, Wetherill Mesa, Mesa Verde National Park, Montezuma County, Colorado 2 by Alan Cressler sourceFeedback
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Horticultural Information
No horticultural data found for this taxon.