Rorippa tenerrima |
Rorippa sinuata |
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low yellow-cress, Modoc yellow-cress, slender yellowcress, watercress, yellow cress |
spreading yellow-cress, western yellow-cress |
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Habit | Annuals; (terrestrial or of wet habitat, not submerged); glabrous throughout. | Perennials; (rhizomatous or with creeping roots); sparsely to moderately pubescent, (trichomes hemispherical, vesicular). |
Stems | (several-branched from base), prostrate to decumbent, branched distally, 0.7–3.5(–4) dm. |
(many to few from base), decumbent or prostrate, branched distally, 1–4.2(–5) dm, (pubescent proximally). |
Basal leaves | not rosulate; blade margins pinnatifid. |
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. |
sessile; blade oblong to oblanceolate or lanceolate (lateral lobes oblong or ovate), (1.5–)2.5–6.5(–9) cm × 5–18(–25) mm, base usually auriculate, rarely proximalmost not auriculate, margins pinnatifid to deeply sinuate, or (lateral lobes) dentate to sinuate or entire, (surfaces pubescent abaxially with vesicular trichomes on veins, glabrous adaxially). |
Racemes | elongated. |
considerably 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. |
sepals ascending, oblong, 2.2–3.7(–4.5) × 1–1.8 mm; petals yellow, oblanceolate to spatulate, (2.7–)3.2–5.3(–6) × 1.5–2.5 mm; median filaments 3–5.5 mm; anthers narrowly oblong, 1.2–1.7 mm. |
Fruiting pedicels | ascending to divaricate, (1–)1.5–3.2(–4.2) mm, straight. |
divaricate-ascending to horizontal, sigmoid or recurved, 4–12(–14.5) mm. |
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. |
siliques, curved, oblong to lanceolate or linear, (4–)5–12(–16) × (1–)1.5–2.5 mm; valves glabrous or pubescent; ovules (30–)50–82(–98) per ovary; style (0.8–)1–2.5(–3.5) mm. |
Seeds | biseriate, reddish brown, cordiform, 0.5–0.7 mm, colliculate. |
biseriate, yellow-brown, angled, cordiform, 0.7–1 mm (0.5–0.6 mm diam.), colliculate. |
2n | = 16. |
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Rorippa tenerrima |
Rorippa sinuata |
|
Phenology | Flowering Jun–Oct. | Flowering Apr–Aug. |
Habitat | Shores of lakes and ponds, mud flats, marshes, sand bars, moist grounds, streamsides | Shores of ponds and lakes, sandy banks, stream banks, fields, wet depressions, gravel banks, ditches, moist grounds |
Elevation | 1300-3000 m (4300-9800 ft) | 0-2600 m (0-8500 ft) |
Distribution |
CA; CO; ID; MO; MT; ND; NE; NM; NV; OR; SD; TX; UT; WA; WY; AB; BC; SK; Mexico (Baja California, Chihuahua)
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AR; AZ; CA; CO; IA; ID; IL; KS; KY; LA; MN; MO; MT; ND; NE; NM; NV; OK; OR; SD; TN; TX; UT; WA; WI; WY; AB; BC; ON; SK
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Source | FNA vol. 7, p. 505. | FNA vol. 7, p. 504. |
Parent taxa | Brassicaceae > tribe Cardamineae > Rorippa | Brassicaceae > tribe Cardamineae > Rorippa |
Sibling taxa | ||
Synonyms | Radicula tenerrima | Nasturtium sinuatum, Nasturtium trachycarpum, Radicula sinuata, Radicula trachycarpa, R. trachycarpa |
Name authority | Greene: Erythea 3: 46. (1895) | (Nuttall) Hitchcock: Key Spring Fl. Manhattan, 18. (1894) |
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