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.