1. Dimorphocarpa candicans (Rafinesque) Rollins, Crucifer. Continental N. Amer. 361. 1993; Iberis candicans Rafinesque, Atlantic J. 1: 146. 1832. TYPE: United States, Rocky Mountains, summer 1820, Edwin P. James s.n. (holotype, NY).

Dithyrea wislizeni Engelmann var. palmeri Payson, Ann. Missouri Bot. Gard. 5: 148. 1918; Dimorphocarpa palmeri (Payson) Rollins, Publ. Bussey Inst. Harvard Univ. 1979: 21. 1979. TYPE: United States, Texas, Howard Co., Big Spring, 9 Jul 1917, Edward J. Palmer 12493 (holotype, MO!; isotypes, TEX!, UC!).

Herbs, annual or biennial. Stems (3–)4–8(–10) dm, erect, simple at base, branched above. Basal leaves with petioles 1–4(–6) cm; leaf blade lanceolate to oblong or ovate, (2–)4–8(–10) x (1–)1.5–2.5(–4) cm, base cuneate to obtuse, margin dentate; upper cauline leaves sessile, ovate to narrowly oblong or lanceolate, base obtuse to truncate, margin entire or repand, base cuneate. Fruiting pedicels divaricate, (0.8–)1–1.6(–2) cm, pubescent all around. Sepals oblong, 3.5–5 x 1–1.5 mm, pubescent outside; petals white or lavender, obovate, (7–)8–10(–12) x 4–6(–7) mm, attenuate to claw; claw 2–3 mm, not expanded at base; filaments 3–4 mm, lavender or white; anthers oblong, 1–1.5 mm. Fruit halves suborbicular or orbicular, (7–)8–10 x (6–)7–10 mm, truncate at apex, rounded at base, with or without a narrow margin beyond the indurated part surrounding the seeds, glabrous or pubescent; style (0.3–)0.6–1(–1.2) mm. Seeds brown, suborbicular-ovate, 3–4 x 2.5–3 mm. 2n = 18.

Flowering; Apr–Sep.

Habitat: sandy hills and plains, prairies, sand dunes.

Elevation: 100–800 m.

Distribution: United States (Kansas, New Mexico, Oklahoma, Texas).