Tropicos | Name - Dimorphocarpa pinnatifida Rollins

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Dimorphocarpa pinnatifida Rollins

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Published In: Publications of the Bussey Institution, Harvard University 1979: 28–29, map 1. 1979. (20 Mar 1979) (Publ. Bussey Inst. Harvard Univ.)

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3. Dimorphocarpa pinnatifida Rollins, Publ. Bussey Inst. Harvard Univ. 1979: 28. 1979. TYPE: Mexico, Sonora, ca. 5 miles NE of Sierra del Rosario, Gran Desierto, ca. 150 m, 32º8´N, 114º0´W, 4 Mar 1972, H. T. Cross, L. A. May, and R. S. Felger 20429 (holotype, GH!; isotypes, ARIZ, SD).

Herbs, annual. Stems 2–9 dm, erect, branched at base and above. Basal leaves with petioles 0.5–2 cm; leaf blade linear to linear-lanceolate, (2–)3–6(–8) cm x (2–)3–5(–8) mm, pinnatifid, base attenuate; upper cauline leaves short-petiolate or subsessile, linear to narrowly lanceolate, pinnately lobed, base cuneate. Fruiting pedicels divaricate to slightly reflexed, (0.8–)1–1.7(–2.2) cm, pubescent all around, straight. Sepals oblong, 2–3 x 1–1.5 mm, pubescent outside; petals white, obovate, (3.5–)4–6.5 x 2–3.5 mm, attenuate to claw; claw 1–1.5 mm, expanded at base; filaments 2–3 mm, white; anthers oblong, 0.8–1.1 mm. Fruit halves orbicular, 5–6.5 x 6–7 mm, rounded at apex and base, not margined beyond the indurated part surrounding the seeds, pubescent; style 0.5–1 mm. Seeds brown, suborbicular, 2.5–3.5 x 2–3 mm. 2n = 18.