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
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.
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