Prostrate or spreading, odoriferous perennial; stems to 6 dm, villous- puberulent; lvs numerous, obscurely puberulent, finely resinous-glandular beneath, subsessile, 1-4 cm, narrowly oblong, deeply and irregularly pinnatilobate, the upper much reduced; fls in small axillary glomerules; cal urceolate, shallowly 5-lobed, at maturity 1.5-2.5 mm, obovoid, raised-reticulate-veiny, and loosely but completely enclosing the fr; stamens 5; styles 2-5, basally connate; pericarp thin, free, seed erect, obovate, thick-lenticular, smooth, 1 mm wide; 2n=32. Native of S. Amer., intr. in waste places in our range, esp. southward. (Roubieva m.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.