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Durango yellowcress

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

Phenology Flowering Mar–May.
Habitat Floodplains, sandy arroyo bottoms, lake shores
Distribution
from FNA
TX; Mexico (Coahuila, Durango)
[BONAP county map]
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 Brassicaceae > tribe Cardamineae > Rorippa
Sibling taxa
R. alpina, R. amphibia, R. aquatica, R. austriaca, R. barbareifolia, R. calycina, R. columbiae, R. crystallina, R. curvipes, R. curvisiliqua, R. dubia, R. indica, R. microtitis, R. palustris, R. sessiliflora, R. sinuata, R. sphaerocarpa, R. subumbellata, R. sylvestris, R. tenerrima, R. teres
Name authority Rollins: Rhodora 63: 4, figs. A–C. (1961)
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