Froelichia gracilis (Hook.) Moq.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Slender, erect to nearly prostrate, commonly branched from near the base, 2–7 dm; lvs mostly below the middle of the stem, linear to narrowly lanceolate, the larger ones to ca 8 × 1 cm; spikes 1–3 cm; fls in a 3-rowed spiral, avg 6–10 per cm; mature cal obliquely conic, mostly 3.5–4 mm; seeds 1.2–1.4 mm; otherwise much as in no. 1 [Froelichia floridana (Nutt.) Moq.]; 2n=54. Dry soil; Ind. to Io. and Colo., s. to Ark. and n. Mex.; adventive especially along railroad-tracks e. to s. Ont., Mass., and S.C. July–Sept.