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FNA | Family List | FNA Vol. 7 | Brassicaceae | Rorippa

7. Rorippa columbiae (S. Watson) Howell, Fl. N.W. Amer. 40. 1897. (as Roripa).

Nasturtium sinuatum Nuttall var. columbiae S. Watson in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 147. 1895; N. columbiae (S. Watson) Suksdorf; N. sinuatum var. pubescens S. Watson; Radicula columbiae (S. Watson) Greene; Rorippa calycina (Engelmann) Rydberg var. columbiae (S. Watson) Rollins; R. sinuata (Nuttall)Hitchcock var. pubescens (S. Watson) Howell

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.

Flowering Jun-Aug. Stream banks, ditches, margins of lakes and ponds, meadows, roadsides, gravel bars, wet fields; 100-1600 m; Calif., Oreg., Wash.


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