Habitally like T. repens; peduncles becoming 8-15 cm; heads globose or ovoid, 10-15 mm thick at anthesis; fls 6-7 mm; cal bilabiate, the upper lip 2-3 mm, half longer than the lower and much more villous, the lobes narrowly linear, 0.7-1 mm; cor rosy; cal at maturity becoming reddish, greatly enlarged, strongly reticulate, and gibbous on the upper side, the lower lip scarcely altered; 2n=16. Native of Eurasia and n. Afr., becoming established as a lawn-weed here and there in our range. Summer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.