Talinum calycinum Engelm.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Infl 1–3 dm; sep prolonged at base like the bracts; pet 10–16 mm, deep rose-pink to rose-red; stamens 20–45; stigma capitate; fr 6–8 mm. Barrens and rocky ledges; s. Ill. and s. Mo. to Neb., Kans., and Tex. May, June. Fls open only in early to mid-afternoon.