Rhizomatous perennial, 1.5-4.5 dm, the 4-angled stems glaucous and sometimes sparsely hispidulous; lvs narrowly lanceolate, sessile, 2-8 cm נ2-10 mm, hispidulous on the midrib and margins, otherwise sparsely puberulent and glabrate; infl open, the ciliate bracts herbaceous; pedicels pubescent, slender, 2-7 cm; sep broadly lanceolate, 6-9 mm, acute, glabrous, obscurely 5-11-veined; pet conspicuously exceeding the sep, notched less than half-way to the base; seeds 2-2.5 mm, obliquely reniform, coarsely papillate; 2n=26. Native of Eurasia, often escaped from cult. in our range. Apr.-June. (Alsine h.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.