Asclepias speciosa Torr.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Apocynaceae
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Scientific Name
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Description
Species Description - Colonial by roots; stem stout, erect, to 1 m, hairy; lvs ovate to lance-ovate or ovate-oblong, 10–15 cm, broadly rounded or subcordate at base, hairy beneath; petioles 3–6 mm; umbels usually few, 5–7 cm wide; peduncles stout, 3–7 cm; cor greenish-purple, its lobes 10–15 mm; hoods 10–15 mm, abruptly narrowed below the middle to a linear-oblong tip; horns short, inflexed; fr densely tomentose and beset with soft filiform processes; 2n=22. Moist prairies; Man. to Minn., Io., and Okla., w. to B.C. and Calif. July, Aug.
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Common Names
showy milkweed