Sepals narrowly lanceolate, enlarging to 7-8 mm in fruit; petals 5-8 mm, 1.5-2 times as long as sepals. 2n = 52 (Peru). Flowering Mar-Oct, after rains. Gulleys, among boulders in mountains; 2400-2700 m; N.Mex., Tex.; Mexico; South America.