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)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU
• Eastern Mountains and Piedmont: FACU
• Great Plains: FACU
• Midwest: FACU
• Northcentral & Northeast: UPL

Heliophily: 8