Rorippa columbiae

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

Distribution

• Generated Map
• Legacy Map

Calif., Oreg., Wash.

Discussion

Selected References

None.

Lower Taxa

None.