[Hypericum petiolatum Walt., moreHypericum tubulosum var. walteri (J.F.Gmel.) Lott, Hypericum walteri J. G. Gmel., Triadenum petiolatum (Walt.) Britt., Triadenum tubulosum var. walteri (Gmel.) T.S. Cooperrider]
Erect, rhizomatous perennial to 1 m, simple or branched above; lvs translucent-dotted, lance-elliptic to oblong or lance-oblong, 5-12 נ1-3 cm, dark-punctate beneath, obtuse or rounded above, narrowed below to a petiole 3-15 mm; cymes terminal and from the upper axils, on peduncles 1-4 mm; pet 5-7 mm; fr 7-12 mm; styles 1 mm. Swamps and marshes on the coastal plain; Md. to Fla. and Tex., n. in the interior to s. Ind. and s. Mo. July-Sept. (Hypericum w.; H. petiolatum Walter, not L.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.