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31.
Draba cuneifolia
Nuttall ex Torrey & A. Gray, Fl. N. Amer. 1: 108. 1838.
Annuals;
scapose or subscapose.
Stems
(simple to many from or near base), unbranched, (0.2-) 0.3-2.7(-3.7) dm, hirsute or pubescent throughout, trichomes 3-4-rayed, 0.05-0.4 mm, (sometimes mixed proximally with simple or spurred ones, 0.5-1.2 mm).
Basal leaves
not rosulate; petiole (obscure), not ciliate; blade oblanceolate to spatulate or broadly obovate, (0.4-)1-3.5(-5) cm × (2-)6-20(-28) mm, margins dentate (in distal 1/2), surfaces pubescent, abaxially with stalked, 2-4-rayed trichomes, 0.1-0.7 mm, adaxially similar or also with fewer, simple trichomes, 0.4-0.7 mm.
Cauline leaves
0-6 (on proximal 1/3 of stem); blade similar to basal.
Racemes
10-50(-70)-flowered (throughout or on distal 1/3 of scape), ebracteate, elongated in fruit; rachis not flexuous, densely pubescent, trichomes 2-4-rayed.
Fruiting pedicels
horizontal to divaricate-ascending, straight, (1-)2-7(-10) mm, pubescent as rachis.
Flowers:
(late ones cleistogamous, apetalous); sepals (green or pink), oblong, 1.5-2.5 mm, glabrous or pubescent, (trichomes simple); petals white, spatulate, (2-)2.5-4.5(-5) × 1-2 mm, (emarginate or obtuse); anthers ovate to oblong, (0.1-)0.25-0.4 mm.
Fruits
oblong to linear or lanceolate to broadly ovate, plane, flattened, (3-) 6-12(-16) × 1.7-2.7(-3) mm; valves usually puberulent, rarely glabrous, trichomes simple, antrorse, 0.1-0.3 mm, (rarely with 2-rayed ones, or all trichomes short-stalked, 4-rayed, cruciform); ovules (12-)24-66 (-72) per ovary; style 0.01-0.3(-0.4) mm.
Seeds
broadly ovoid, 0.5-0.7 × 0.4-0.5 mm.
2
n
= 30, 32.
Varieties 3 (3 in the flora): United States, n Mexico.
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Updated: 2024-05-03 05:38:10 gmt
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