Rorippa sylvestris

(Linnaeus) Besser
Enum. Pl., 27. 1821.
WeedyIntroducedIllustrated
Basionym: Sisymbrium sylvestre Linnaeus Sp. Pl. 2: 657. 1753
Synonyms: Brachiolobos sylvestris (Linnaeus) Allioni Nasturtium sylvestre (Linnaeus) W. T. Aiton Radicula sylvestris (Linnaeus) Druce
Treatment appears in FNA Volume 7. Treatment on page 505. Mentioned on page 494, 496.

Perennials; glabrous or sparsely pubescent. Stems prostrate, decumbent, ascending, or suberect, branched mainly basally, (0.5–)1.5–8(–10) dm. Basal leaves not rosulate; similar to cauline. Cauline leaves petiolate, or (distal) often subsessile; blade deeply pinnatisect, (lobes 3–6 on each side, sublinear, lanceolate, oblong, elliptic, or ovate), (2–)3.5–15(–20) cm × (7–)10–45(–60) mm, base usually not auriculate, rarely minutely auriculate, margins dentate, serrate, subentire, or (distally) pinnatisect, (lobes 1–3 on each side). Racemes elongated. Fruiting pedicels divaricate, straight, (3–)4–10(–12) mm. Flowers: sepals ascending or spreading, oblong, 1.8–3(–3.5) × 0.7–1.5 mm; petals yellow, spatulate or obovate, (2.2–)2.8–5.5(–6) × 1.5–2.5 mm; median filaments (1.5–)1.8–3.5(–4) mm; anthers oblong, 0.7–1 mm. Fruits siliques, straight, usually linear, rarely oblong-linear, 10–20(–25) × (0.7–)1–1.3(–1.6) mm; valves glabrous; ovules 24–80 per ovary; style 0.5–1(–1.5) mm. Seeds (rarely produced), usually uniseriate, rarely sub-biseriate, reddish brown, ovoid, 0.5–0.9 mm (0.4–0.5 mm diam.), colliculate. 2n = 32, 40, 48.


Phenology: Flowering May–Aug.
Habitat: Along ditches, damp areas, shores of ponds and lakes, sandy beaches, waste grounds, ditches, wet roadsides, meadows, washes, fields, gardens
Elevation: 0-2500 m

Distribution

V7 789-distribution-map.gif

Introduced; Alta., B.C., N.B., Nfld. and Labr. (Nfld.), Ont., P.E.I., Que., Ala., Ark., Colo., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Europe, sw Asia, introduced also in South America.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Rorippa sylvestris"
Ihsan A. Al-Shehbaz +
(Linnaeus) Besser +
Sisymbrium sylvestre +
Alta. +, B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, Ont. +, P.E.I. +, Que. +, Ala. +, Ark. +, Colo. +, Conn. +, Del. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, Tenn. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Europe +, sw Asia +  and introduced also in South America. +
0-2500 m +
Along ditches, damp areas, shores of ponds and lakes, sandy beaches, waste grounds, ditches, wet roadsides, meadows, washes, fields, gardens +
Flowering May–Aug. +
Weedy +, Introduced +  and Illustrated +
Brachiolobos sylvestris +, Nasturtium sylvestre +  and Radicula sylvestris +
Rorippa sylvestris +
species +