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Rorippa ramosa
Rollins
Family:
Brassicaceae
Durango Yellowcress
FNA
Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Perennials;
glabrous or sparsely pubescent, (trichomes hemi-spherical, vesicular).
Stems
(simple or several from base), prostrate, branched distally, (1-) 2-5(-6) dm, (pubescent).
Basal leaves
not rosulate; blade margins pinnatifid.
Cauline leaves
sessile; blade oblong to oblanceolate or broadly lanceolate (lateral lobes oblong to ovate), (2-)3-5 cm × 5-15 mm, base auriculate, margins pinnatifid to deeply sinuate or entire, (surfaces sparsely pubescent abaxially with vesicular trichomes along veins, glabrous adaxially).
Racemes
slightly elongated.
Fruiting pedicels
ascending to horizontal, usually straight, rarely curved-ascending, 3-5(-6.5) mm, (sparsely pubescent).
Flowers:
sepals erect, oblong, 2-2.5 × 0.8-1.3 mm; petals pale yellow, spatulate, 2.5-3.5 × 0.8-1.3 mm; median filaments 2.7-3 mm; anthers narrowly oblong, 0.7-0.9 mm.
Fruits
siliques, curved, oblong to lanceolate, 6-10 × 2-3 mm; valves glabrous or puberulent; ovules 60-80 per ovary; style 1-2(-2.5) mm.
Seeds
biseriate, light brown, cordiform, 0.7-1.5 mm, colliculate.
Flowering Mar-May. Floodplains, sandy arroyo bottoms, lake shores; Tex.; Mexico (Coahuila, Durango).
Rorippa ramosa
is known from the Big Bend area in Brewster County and in adjacent Mexico.
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Roy Morey
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