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

3. Thysanocarpus laciniatus Nuttall in J. Torrey and A. Gray, Fl. N. Amer. 1: 118. 1838.

Stems 1-6 dm. Basal leaves: blade oblanceolate to elliptic, 1-6 cm, margins often pinnatifid with narrow lobes (lobes 0.5-1.5 mm), sometimes sinuate-dentate or subentire, surfaces usually glabrous, rarely sparsely hirsute, trichomes whitish, 0.3-0.4 mm. Cauline leaves: blade linear to narrowly elliptic, widest near middle or equally wide throughout, base not auriculate or with small, inconspicuous auricles (not extending around stem). Racemes: internodes (1.5-)2-4.5 mm in fruit. Fruiting pedicels smoothly recurved or straight and stiffly spreading, (proximal) 3-6(-10) mm. Fruits flat or plano-convex, obovate to nearly orbicular, (2.5-5 mm wide); valves often glabrous, sometimes pubescent, trichomes clavate, 0.05-0.4 mm; wing entire or deeply crenate, rays absent or indistinct.

Varieties 3 (3 in the flora): sw United States, nw Mexico.

1 Fruit valves pubescent, trichomes 0.05-0.1 mm.   3b Thysanocarpus laciniatus var. hitchcockii
+ Fruit valves usually glabrous, or trichomes 0.2-0.4 mm   (2)
2 (1) Foliage usually greenish throughout, sometimes purplish basally; basal leaf blade margins pinnatifid or sinuate-dentate; fruiting pedicels smoothly recurved.   3a Thysanocarpus laciniatus var. laciniatus
+ Foliage purplish throughout; basal leaf blade margins subentire to sinuate-dentate; fruiting pedicels straight or nearly so.   3c Thysanocarpus laciniatus var. rigidus

Lower Taxa


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