Asclepias quadrifolia Jacquin. Fourleaf Milkweed. Phen: May-Jun; Aug-Sep. Hab: Moist to dryish forests and forest margins, most common on mafic and calcareous substrates. Dist: NH and NY west to IN, south to NC, n. GA, n. AL, and c. TN; also from w. IL west to MO, south to AR and OK.

Origin/Endemic status: Native

Synonymy: = Ar, C, F, G, GrPl, Il, K1, K3, K4, Mo2, NE, NY, Ok, Pa, RAB, S, Tn, Va, W, Woodson (1954)

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