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Asclepias tuberosa Linnaeus var. 1 . Western Butterflyweed. Phen: (Apr-) May-Sep (-Oct); Jun-Oct. Hab: Prairies. Dist: SD, CO, s. UT south to e. TX, s. TX, s. NM, s. AZ, and Mexico (TAM, NLE, COA, CHH, and SON).

Origin/Endemic status: Native

Synonymy: = Asclepias tuberosa L. ssp. terminalis Woodson – Tx, Woodson (1954); < Asclepias tuberosa L. – Mex, Ok; < Asclepias tuberosa L. ssp. interior Woodson – Ar, FNA14, GrPl, K1, K3, K4

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Heliophily: 9

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