Asclepias perennis Walter
Family: Apocynaceae
Aquatic Milkweed
[Asclepias parvula ]
Asclepias perennis image
Stems slender, often branched, 4-8 dm, pubescent in narrow lines; lvs thin, lanceolate to narrowly elliptic, 5-14 cm, gradually tapering at base into a conspicuous petiole; umbels solitary or few; cor white, the lobes 3-4 mm; hoods and horns as in no. 3 [Asclepias incarnata L.], 2-3 mm; seeds without a coma. Swamps and wet woods; s. coastal plain from S.C. to Tex., n. in the Mississippi and Ohio valleys to s. Mo. and s. Ind. July, Aug.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
From Flora of Indiana (1940) by Charles C. Deam
Infrequent in swampy woods, and about sloughs and ponds, mostly in the southwestern counties