Rorippa columbiae

(S. Watson) Howell
Fl. N.W. Amer., 40. 1897.
Basionym: Nasturtium sinuatum var. columbiae S. Watson in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 147. 1895
Synonyms: Nasturtium columbiae (S. Watson) Suksdorf Nasturtium sinuatum var. pubescens S. Watson Radicula columbiae (Engelmann) Rydberg Rorippa calycina var. columbiae (S. Watson) Rollins Rorippa sinuata var. pubescens (S. Watson) Howell
Treatment appears in FNA Volume 7. Treatment on page 499. Mentioned on page 494, 495.

Perennials; (terrestrial or of wet habitat, not submerged, with creeping roots and adventitious stems); pilose or hirsute. Stems suberect or decumbent to prostrate, branched distally, 1–3.2(–4.1) dm, (pilose to hirsute). Basal leaves absent. Cauline leaves shortly petiolate or sessile; blade oblanceolate to oblong, (lateral lobes oblong to ovate, often reaching midrib), 2.4–5.2 cm × 5–12 mm, base auriculate or not, margins sinuate to pinnatifid or (lateral lobes) entire or dentate, (surfaces pilose). Racemes elongated. Fruiting pedicels ascending, (subappressed to rachis), straight, (3–)4–10(–12) mm, (densely pilose). Flowers: sepals (persistent), ascending, oblong, 2–3.5 × 0.8–1.5 mm, (pilose); petals yellow, oblanceolate to spatulate, 2.7–4.2 × 0.7–1.7 mm; median filaments 2–3.5 mm; anthers ovate, ca. 0.8 mm. Fruits silicles, straight, subglobose to oblong ellipsoid, (1.5–)2.5–5.5(–7) × (1–)1.7–2.8(–3.5) mm; valves densely pilose; ovules 24–40 per ovary; style 0.7–3.2 mm, (pilose). Seeds biseriate, yellowish brown, ovoid-globose, 0.7–0.9 mm, prominently colliculate.

Phenology: Flowering Jun–Aug.
Habitat: Stream banks, ditches, margins of lakes and ponds, meadows, roadsides, gravel bars, wet fields
Elevation: 100-1600 m


Selected References


Lower Taxa


... more about "Rorippa columbiae"
Ihsan A. Al-Shehbaz +
(S. Watson) Howell +
Nasturtium sinuatum var. columbiae +
Calif. +, Oreg. +  and Wash. +
100-1600 m +
Stream banks, ditches, margins of lakes and ponds, meadows, roadsides, gravel bars, wet fields +
Flowering Jun–Aug. +
Fl. N.W. Amer., +
Nasturtium columbiae +, Nasturtium sinuatum var. pubescens +, Radicula columbiae +, Rorippa calycina var. columbiae +  and Rorippa sinuata var. pubescens +
Rorippa columbiae +
species +