Rorippa tenerrima |
|
---|---|
low yellow-cress, Modoc yellow-cress, slender yellowcress, watercress, yellow cress |
|
Habit | Annuals; (terrestrial or of wet habitat, not submerged); glabrous throughout. |
Stems | (several-branched from base), prostrate to decumbent, branched distally, 0.7–3.5(–4) dm. |
Basal leaves | not rosulate; blade margins pinnatifid. |
Cauline leaves | shortly petiolate, or (distal) sessile; blade oblong to oblanceolate or lanceolate, (lateral lobes linear, oblong to ovate, or obovate), 2–9(–11) cm × 7–20(–30) mm, (lateral lobes smaller than terminal), base not auriculate, margins pinnatifid, or (lateral lobes) entire, dentate, or sinuate. |
Racemes | elongated. |
Flowers | sepals ascending, oblong, 0.7–1.3 × 0.4–0.7 mm; petals yellow, oblong to oblanceolate or spatulate, 0.5–0.8 × 0.1–0.3 mm; median filaments 0.8–1.2 mm; anthers ovate, 0.1–0.2 mm. |
Fruiting pedicels | ascending to divaricate, (1–)1.5–3.2(–4.2) mm, straight. |
Fruits | siliques or silicles, curved-ascending, lanceolate to narrowly ovoid or oblong-lanceolate, 3–7(–9) × (0.8–)1–1.7(–2) mm (often slightly constricted at middle); valves papillate; ovules 20–80 per ovary; style (0.2–)0.5–1 mm. |
Seeds | biseriate, reddish brown, cordiform, 0.5–0.7 mm, colliculate. |
Rorippa tenerrima |
|
Phenology | Flowering Jun–Oct. |
Habitat | Shores of lakes and ponds, mud flats, marshes, sand bars, moist grounds, streamsides |
Elevation | 1300-3000 m (4300-9800 ft) |
Distribution |
CA; CO; ID; MO; MT; ND; NE; NM; NV; OR; SD; TX; UT; WA; WY; AB; BC; SK; Mexico (Baja California, Chihuahua)
|
Source | FNA vol. 7, p. 505. |
Parent taxa | Brassicaceae > tribe Cardamineae > Rorippa |
Sibling taxa | |
Synonyms | Radicula tenerrima |
Name authority | Greene: Erythea 3: 46. (1895) |
Web links |
|