Asclepias sullivantii Engelmann ex A. Gray. Prairie Milkweed, Sullivant's Milkweed. Phen: (May-) Jun-Auh (-Sep); Jun-Oct. Hab: Calcareous prairies, riverbanks, bottomlands. Dist: ON, MI, Wim MN, and e. ND south to sc. OH, s. IN, s. IL, MO, and OK.

Origin/Endemic status: Native

Synonymy: = C, F, FNA14, G, GrPl, Il, K3, K4, Mi, Mo2, Ok, Woodson (1954)

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Wetland Indicator Status:

• Eastern Mountains and Piedmont: FAC
• Great Plains: FAC
• Midwest: FAC
• Northcentral & Northeast: FAC

Heliophily: 8