Flowers: sepals green; stigmas green. Capsules relatively thick-walled, opaque. 2n = 30.

Flowering Apr–Aug. Sandy, gravelly soils; 100–2300 m; Ark., Colo., Kans., La., Nebr., N.Mex., Okla., Tex.

C. M. Rogers (1984) found that there were small, compact, much-branched, and very leafy plants, especially in the northern part of the range, and suggested that these needed further study. In southern Texas, Rogers found a form with comparatively few, large, spheric, marginal glands on the sepals.