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FNA | Family List | FNA Vol. 7 | Brassicaceae | Descurainia

11. Descurainia pinnata (Walter) Britton, Mem. Torrey Bot. Club. 5: 173. 1894.

Erysimum pinnatum Walter, Fl. Carol. 174. 1788; Sophia pinnata (Walter) Howell

Annuals; glandular or egland-ular; sparsely to densely pubescent, sometimes glabrous distally, canescent or not, trichomes dendritic. Stems erect, unbranched or branched basally and/or distally, (0.8-)1.3-5.7(-9.2) dm. Basal leaves: petiole 0.5-3.6 cm; blade 1- or 2-pinnate, ovate or oblong to oblanceolate in outline, 1-15 cm, lateral lobes (4-9 pairs), linear or oblanceolate to ovate, margins entire or dentate. Cauline leaves sessile or shortly petiolate; blade smaller distally, distal lobes often narrower, surfaces densely pubescent. Racemes considerably elongated in fruit. Fruiting pedicels usually ascending to divaricate or horizontal, rarely descending (at 20-110º angle), straight or slightly recurved, 4-18 (-23) mm. Flowers: sepals spreading to ascending, yellow, purple, or rose, oblong, 0.8-2.6 mm, pubescent; petals (whitish or yellow), narrowly oblanceolate, 1-3 × 0.3-1 mm; median filaments 1-2.8 mm; anthers 0.2-0.4 mm. Fruits erect to ascending, usually clavate, rarely broadly linear (wider distally), not torulose, 4-13(-17) × 1.2-2.2 mm; valves each with distinct midvein; septum not veined; ovules 16-40 per ovary; style obsolete, 0.02-0.2 mm, glabrous. Seeds biseriate, reddish brown, oblong, 0.6-0.9 × 0.4-0.5 mm.

Subspecies 4 (4 in the flora): North America, n Mexico.

1 Rachises glabrous, eglandular.   11d Descurainia pinnata subsp. glabra
+ Rachises sparsely to densely pubescent, glandular or eglandular   (2)
2 (1) Plants canescent, often eglandular; stems branching basally or distal to base; sepals purple or rose.   11c Descurainia pinnata subsp. ochroleuca
+ Plants not canescent, often glandular; stems unbranched basally; sepals yellow or rose   (3)
3 (2) Fruiting pedicels 4-14(-17) mm, forming (60-)70-90(-110)º angles; sepals rose (at least apically), 0.8-2 mm; petals 1-1.8 mm.   11a Descurainia pinnata subsp. pinnata
+ Fruiting pedicels (7-)10-18(-23) mm, forming 20-60(-80)º angles; sepals yellow, 1.5-2.6 mm; petals (1.7-)2-3 mm.   11b Descurainia pinnata subsp. brachycarpa

Lower Taxa


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