Rorippa ramosa |
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Durango yellowcress |
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Habit | Perennials; glabrous or sparsely pubescent, (trichomes hemispherical, 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. |
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. |
Fruiting pedicels | ascending to horizontal, usually straight, rarely curved-ascending, 3–5(–6.5) mm, (sparsely pubescent). |
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. |
Rorippa ramosa |
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Phenology | Flowering Mar–May. |
Habitat | Floodplains, sandy arroyo bottoms, lake shores |
Distribution |
TX; Mexico (Coahuila, Durango) |
Discussion | Rorippa ramosa is known from the Big Bend area in Brewster County and in adjacent Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 502. |
Parent taxa | |
Sibling taxa | |
Name authority | Rollins: Rhodora 63: 4, figs. A–C. (1961) |
Web links |