Lepidium ruderale

Linnaeus

Sp. Pl. 2: 645. 1753.

WeedyIntroducedIllustrated
Synonyms: Lepidium texanum Buckley Lepidium virginicum subsp. texanum (Buckley) Thellung
Treatment appears in FNA Volume 7. Treatment on page 592. Mentioned on page 573.

Annuals or biennials; (fetid); puberulent (trichomes cylindrical). Stems simple from base, erect ascending, branched (several) distally, (0.5–)1–3.5(–5.5) dm. Basal leaves rosulate; petiole 1–3.2(–5.3) cm; blade (1- or) 2- or 3-pinnatisect (lobes oblong), (1.5–)3–5(–7.2) cm, margins (of lobes) usually entire, rarely dentate. Cauline leaves sessile; blade linear, (0.4–)1–2(–3) cm × 0.5–2.5(–3.5) mm, base cuneate, not auriculate, margins entire. Racemes considerably elongated in fruit; rachis puberulent, trichomes straight, cylindrical. Fruiting pedicels divaricate to horizontal, straight, (terete), (1.5–)2–4(–5) × 0.1–0.15 mm, puberulent. Flowers: sepals oblong, 0.5–0.9(–1) × 0.2–0.4 mm; petals (absent or rudimentary), white, linear, 0.2–0.5 × 0.1 mm, claw absent; stamens 2, median; filaments 0.7–0.8 mm; anthers 0.1–0.2 mm. Fruits elliptic, (1.5–)1.8–2.5(–3) × 1.5–2(–2.3) mm, apically winged, apical notch 0.1–0.2 mm deep; valves thin, smooth, not veined, glabrous; style obsolete or to 0.1 mm, included in apical notch. Seeds oblong to ovate-oblong, 1–1.5 × 0.6–0.8 mm. 2n = 16, 32.


Phenology: Flowering Apr–Jul.
Habitat: Fields, pastures, waste places, roadsides, gardens
Elevation: 0-300 m

Distribution

V7 960-distribution-map.gif

Introduced; Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Ala., Ark., Calif., Del., Fla., Ind., La., Maine, Md., Mass., Mich., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Oreg., Pa., R.I., Tenn., Tex., Eurasia, introduced also in South America, Australia.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Lepidium ruderale"
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
Linnaeus +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ala. +, Ark. +, Calif. +, Del. +, Fla. +, Ind. +, La. +, Maine +, Md. +, Mass. +, Mich. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, Tenn. +, Tex. +, Eurasia +, introduced also in South America +  and Australia. +
0-300 m +
Fields, pastures, waste places, roadsides, gardens +
Flowering Apr–Jul. +
Weedy +, Introduced +  and Illustrated +
Lepidium texanum +  and Lepidium virginicum subsp. texanum +
Lepidium ruderale +
Lepidium +
species +