Tropicos | Name - Dimorphocarpa wislizeni (Engelm.) Rollins

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Dimorphocarpa wislizeni (Engelm.) Rollins

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4. Dimorphocarpa wislizeni (Engelmann) Rollins, Publ. Bussey Inst. Harvard Univ. 1979: 24. 1979; Dithyrea wislizeni Engelmann in F. A. Wislizenius, Mem. Tour N. Mexico, 95. 1848; Biscutella wislizeni (Engelmann) Bentham & J. D. Hooker ex W. H. Brewer & S. Watson, Bot. California 1: 48. 1876. TYPE: United States, New Mexico, “sandy soil near Valverde and Fray Cristobal, N of Jornado del Muerto,” 31 Jul 1846, A. Wislizenius 63 (holotype, MO!).

Dithyrea griffithsii Wooton & Standley, Contrib. U.S. Natl. Herb. 16: 124. 1913; D. wislizeni var. griffithsii (Wooton & Standley) Payson, Ann. Missouri Bot. Gard. 5: 148. 1918. TYPE: United States, New Mexico, Arroyo Ranch, near Roswell, 1–4 Sep 1903, David Griffiths 5687 (holotype, US!).

Herbs, annual. Stems (1–)2–6(–8) dm, erect, simple or branched at base, branched above. Basal and lowermost leaves with petioles 1–4(–5) cm; leaf blade lanceolate to linear-lanceolate, (2–)3–7(–10) x 0.4–1.5(–2) cm, base cuneate to attenuate, margin pinnately lobed to coarsely dentate; upper cauline leaves short-petiolate or subsessile, linear to narrowly lanceolate, base cuneate, margin entire, rarely dentate or repand. Fruiting pedicels divaricate to slightly reflexed, (0.6–)0.8–1.4(–2.2) cm, pubescent all around. Sepals oblong, (2.5–)3–4 x 1–1.5 mm, pubescent outside; petals white or lavender, obovate, 4–7(–8) x (2.5–)3–4(–5) mm, attenuate to claw; claw 1–1.5 mm, expanded at base; filaments 2–3.5 mm, white; anthers oblong, 0.7–1 mm. Fruit halves transversely ovate-oblong, rarely suborbicular, 4–5.5(–6) x 5–7(–7.5) mm, truncate at apex, slightly rounded at base, with or without a narrow wing beyond the indurated part surrounding the seeds, glabrous or pubescent; style 0.5–1(–1.2) mm. Seeds brown, suborbicular-ovate, 2–3 x 1.5–2 mm. 2n = 18.

Flowering: Feb–Oct.

Habitat: sandy roadsides, sandstone knolls, sand hills and dunes, sandy river beds and dry washes, desert flats.

Elevation:1000–2200 m.

Distribution: Mexico (Coahuila, Chihuahua), United States (Arizona, Colorado, Nevada, New Mexico, Utah, Texas).