Plant: Annual forb 40 cm

Leaves: leaves basal, toothed, tinged with red

Flowers: flowers vespertine, pink-yellow with 4 petals

Fruit: a 4-sided capsule, 13-27 mm long.

Notes: flowers open in evening

References: J.C. Hickman, ed. The Jepson Manual.W.B. McDougall. Seed plants of Northern Arizona.ASU specimens.