Asclepias speciosa Torr. - Showy Milkweed


 

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Asclepias speciosa - (image 1 of 5)

 

Taxonomy

Family: Asclepiadaceae

Habitat

Moist prairies.

Associates

 

Distribution

Manitoba to MN, IA, and OK, west to British Columbia and CA

Morphology

Herbaceous perennial, colonial by roots; stem stout, erect, to 1 m, hairy; leaves ovate to lance-ovate or ovate-oblong, 10-15 cm, broadly rounded or subcordate at the base, hairy beneath; petioles 3-6 mm; umbels usually few, 5-7 cm wide; pedicels stout, 3-7 cm; corolla greenish-purple or salmon-colored, its lobes 10-15 mm; hoods 10-15 mm, abruptly narrowed below the middle to a linear-oblong tip; horns short, inflexed; fruit tomentose and with soft filiform processes.

Notes

Flowers July to August

Wetland Indicator: FAC

Similar in appearance to A. syriaca but with much longer hoods.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 


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Michael Hough 2018