Asclepias verticillata Linnaeus. Whorled Milkweed. Phen: (Feb-) May-Oct; (Mar-) Jun-Nov (-Dec). Hab: Barrens, thin soils of rock outcrops (especially mafic or calcareous rocks), prairies, open woodlands, longleaf pine sandhills, pine flatwoods, road and powerline rights-of-way. Dist: E. MA west to ND and MB, south to s. FL, TX, NM, and AZ.
Origin/Endemic status: Native
Taxonomy Comments: Southern Florida material needs study. Several semicryptic taxa are likely included here currently.
Synonymy ⓘ: = Ar, C, F, Fl5, FNA14, G, GrPl, Il, K1, K3, K4, Mi, Mo2, NcTx, NE, NY, Ok, Pa, RAB, S, Tat, Tn, Tx, Va, W, WH3, Woodson (1954)
Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: FACU
- Eastern Mountains and Piedmont: FACU
- Great Plains: FACU
- Midwest: FACU
- Northcentral & Northeast: UPL
Heliophily ⓘ: 8
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