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Durango yellowcress

persistent sepal yellowcress

Habit Perennials; glabrous or sparsely pubescent, (trichomes hemispherical, vesicular). Perennials; (terrestrial or of wet habitat, not submerged); densely hirsute throughout, (trichomes pointed, expanded basally).
Stems

(simple or several from base), prostrate, branched distally, (1–)2–5(–6) dm, (pubescent).

(simple or few from base), erect to prostrate, branched distally, 1–4 dm.

Basal leaves

not rosulate;

blade margins pinnatifid.

not rosulate;

blade margins sinuate.

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).

sessile;

blade oblong to oblanceolate (lateral lobes oblong to ovate), 2.5–5.5(–7) cm × 5–13 mm, base auriculate to amplexicaul, margins sinuate.

Racemes

slightly elongated.

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.

sepals (persistent after anthesis), ascending, oblong-ovate, 2–3.3 × 0.7–1.3 mm;

petals yellow, oblanceolate, (2.2–)2.5–3.7 × 0.7–1.4 mm;

median filaments 1.8–2.2 mm;

anthers oblong, 0.5–0.6 mm.

Fruiting pedicels

ascending to horizontal, usually straight, rarely curved-ascending, 3–5(–6.5) mm, (sparsely pubescent).

ascending to suberect, (somewhat appressed to rachis), straight or curved, 2–5(–6) mm (glabrous or sparsely hirsute).

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.

silicles, straight, globose or broadly oblong, 2–4 × 1.5–2.5 mm;

valves short-strigose;

ovules 30–44 per ovary;

style 1–2.5 mm.

Seeds

biseriate, light brown, cordiform, 0.7–1.5 mm, colliculate.

biseriate, yellowish, ovoid, 0.6–0.7 mm (0.4–0.6 mm diam.), colliculate.

2n

= 16.

Rorippa ramosa

Rorippa calycina

Phenology Flowering Mar–May. Flowering May–Aug.
Habitat Floodplains, sandy arroyo bottoms, lake shores Stream edges, sandy riverbanks, reservoir, pond, and lake margins
Elevation 1000-2000 m (3300-6600 ft)
Distribution
from FNA
TX; Mexico (Coahuila, Durango)
[BONAP county map]
from FNA
MT; ND; WY; NT
[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.)

G. A. Mulligan and A. E. Porsild (1966) reported Rorippa calycina from Northwest Territories and suggested that it may have been introduced to Canada from the main species range in the United States about 4000 km south.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 502. FNA vol. 7, p. 498.
Parent taxa Brassicaceae > tribe Cardamineae > Rorippa 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
R. alpina, R. amphibia, R. aquatica, R. austriaca, R. barbareifolia, R. columbiae, R. crystallina, R. curvipes, R. curvisiliqua, R. dubia, R. indica, R. microtitis, R. palustris, R. ramosa, R. sessiliflora, R. sinuata, R. sphaerocarpa, R. subumbellata, R. sylvestris, R. tenerrima, R. teres
Synonyms Nasturtium calycinum, Nasturtium sinuatum var. calycinum, Nasturtium sinuatum var. pubescens, Radicula calycina, R. sinuata var. pubescens
Name authority Rollins: Rhodora 63: 4, figs. A–C. (1961) (Engelmann ex Hayden) Rydberg: Mem. New York Bot. Gard. 1: 175. (1900)
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