EcoFlora - Asclepias perennis

Asclepias perennis Walter
Family: Apocynaceae Aquatic Milkweed [Asclepias parvula, moreMatelea laevis Nutt.] William Thomas	Gleason & Cronquist Indiana Flora Resources Vascular plants of NE US and adjacent Canada 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. Indiana Coefficient of Conservatism: C = 8 Wetland Indicator Status: OBL Diagnostic Traits: plants decumbent and rooting at the base; principal leaves opposite, lance-ovate (to 4 cn wide); pedicles ascending; corollas white, their lobes to 4 mm long; fruits smooth, glabrous, their seeds lacking a plume.
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