Asclepias tuberosa Linnaeus var. cordata Beck. Midwestern Butterflyweed. Phen: (Apr-) May-Sep (-Oct); Jun-Oct. Hab: Dry forests, roadbanks. Dist: QC, ON, MN, SD, CO, UT, and CA south to PA, WV, KY, TN, and AL.
Origin/Endemic status: Native
Taxonomy Comments: Woodson (1954) called this A. tuberosa ssp. interior, and Shinners made a combination at varietal rank (see synonymy), but the much earlier name A. tuberosa var. cordata Beck clearly applies here.
Synonymy ⓘ: = Asclepias tuberosa L. ssp. interior Woodson – G, Il, Mo2, NcTx, NE, Tx, Woodson (1954); = Asclepias tuberosa L. var. interior (Woodson) Shinners – C, Tn; < Asclepias tuberosa L. – F, Mi, NY, Ok, Pa, S; < Asclepias tuberosa L. ssp. interior Woodson – Ar, FNA14, GrPl, K1, K3, K4
Links to other floras: < Asclepias tuberosa ssp. interior - FNA14
Heliophily ⓘ: 8
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