Rorippa alpina

(S. Watson) Rydberg

Mem. New York Bot. Gard. 1: 176. 1900.

Basionym: Nasturtium obtusum var. alpinum S. Watson Botany (Fortieth Parallel), 15. 1871
Synonyms: Radicula alpina (S. Watson) Greene Rorippa curvipes var. alpina (S. Watson) Stuckey Rorippa obtusa var. alpina (S. Watson) Britton
Treatment appears in FNA Volume 7. Treatment on page 496. Mentioned on page 495.

Perennials; (terrestrial or of wet habitat, not submerged, caudex branched or simple, well-developed); usually glabrous. Stems usually decumbent to prostrate, rarely erect, much-branched basally and distally, (0.3–)0.4–1.9(–2.6) dm (rarely pilose basally). Basal leaves not rosulate; [petiole (0.3–)0.9–2(–2.5) cm]; blade [(0.6–)1–3.2(–4) cm × (2–)3–8(–15) mm], margins usually dentate to pinnatifid, rarely repand. Cauline leaves petiolate or subsessile; blade obovate to oblanceolate, smaller distally, base cuneate, attenuate, not auriculate, margins entire, crenate, or repand. Racemes elongated. Fruiting pedicels ascending to horizontal or slightly reflexed, straight or curved, (2–)3–6(–8) mm. Flowers: sepals ascending, oblong, 1–1.7(–2) × 0.6–0.8 mm; petals yellow, spatulate, (1.3–)1.5–2 × 0.5–0.8 mm; median filaments 0.8–1.2 mm; anthers ovate, 0.3–0.4 mm. Fruits often siliques, sometimes silicles, straight or slightly curved, oblong to lanceolate or ovoid, 3–7(–8) × 1.4–2.1(–2.7) mm; valves glabrous; ovules 26–42 per ovary; style (0.3–)0.5–1(–1.2) mm. Seeds biseriate, yellow-brown, ovoid to subglobose, 0.5–0.7 mm (0.4–0.5 mm diam.), reticulate. 2n = 16.

Phenology: Flowering Jun–Sep.
Habitat: Lakeshores, pond margins, streamsides, dried snow ponds, meadows, seep areas
Elevation: 1400-3800 m


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Colo., Idaho, Mont., Nev., Utah, Wyo.


Selected References


Lower Taxa

... more about "Rorippa alpina"
Ihsan A. Al-Shehbaz +
(S. Watson) Rydberg +
Nasturtium obtusum var. alpinum +
Colo. +, Idaho +, Mont. +, Nev. +, Utah +  and Wyo. +
1400-3800 m +
Lakeshores, pond margins, streamsides, dried snow ponds, meadows, seep areas +
Flowering Jun–Sep. +
Mem. New York Bot. Gard. +
Radicula alpina +, Rorippa curvipes var. alpina +  and Rorippa obtusa var. alpina +
Rorippa alpina +
species +