Stems to 1 m, angular, clustered on a stout rhizome; internodes progressively longer distally, the lower ones of the branches commonly much elongate; lvs lanceolate or lance-linear to (especially the lower) elliptic or oblong, sessile, 2-5 cm, acuminate, usually distinctly 5-nerved; pedicels 1-3(-5) mm; cal-lobes linear, long-tapering, 4-9 mm; cor-lobes white, drying creamy, oblanceolate, 8-18 mm; 2n=36. Wet pine-barrens on the coastal plain, often somewhat weedy; N.J. to Fla. June-Aug. (S. lanceolata)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.