Lepidium didymum

Linnaeus

Syst. Nat. ed. 12, 2: 433. 1767.

,

Mant Pl. 1: 92. 1767.

Synonyms: Carara didyma (Linnaeus) Britton Coronopus didymus (Linnaeus) Smith Senebiera didyma (Linnaeus) Persoon Senebiera incisa Willdenow Senebiera pinnatifida de Candolle
Treatment appears in FNA Volume 7. Treatment on page 580. Mentioned on page 570, 572.

Annuals; (fetid); glabrous or pilose. Stems few to several from base, erect to ascending or decumbent, branched distally, 1–4.5(–7) dm. Basal leaves (soon withered); not rosulate; petiole 0.5–4(–6) cm; blade 1- or 2-pinnatisect, 1–6(–8) cm, margins (of lobes) entire or dentate (sometimes deeply lobed). Cauline leaves shortly petiolate to subsessile; blade similar to basal, smaller and less divided distally, lobes lanceolate to oblong or elliptic, 1.5–3.5(–4.5) cm ×5–12 mm, base not auriculate, margins (of lobes) entire, serrate, or incised. Racemes elongated in fruit; rachis glabrous or pubescent, trichomes straight, cylindrical. Fruiting pedicels divaricate to horizontal, straight slightly recurved, (terete), 1.4–2.5(–4) × 0.15–2 mm, glabrous or sparsely pubescent adaxially. Flowers: sepals (tardily deciduous), ovate, 0.5–0.7(–0.9) mm; petals white, elliptic to linear, 0.4–0.5 × ca. 0.1 mm, claw absent; stamens 2, median; filaments 0.3–0.6 mm; anthers 0.1–0.2 mm. Fruits schizocarpic, didymous, 1.3–1.7 × 2–2.5 mm, apically not winged, apical notch 0.2–0.4 mm deep; valves thick, rugose, strongly veined, glabrous; style absent or obsolete, included in apical notch. Seeds ovate, 1–1.2 × 0.7–0.8 mm. 2n = 32.


Phenology: Flowering Mar–Jul.
Habitat: Roadsides, waste areas, lawns, pastures, fields, gardens, disturbed areas
Elevation: 0-1000 m

Distribution

V7 935-distribution-map.gif

Introduced; B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Que., Ala., Ariz., Ark., Calif., Conn., Fla., Ga., La., Maine, Md., Mass., Miss., Mo., N.J., N.Y., N.C., Ohio, Oreg., Pa., S.C., Tenn., Tex., Va., W.Va., Wis., South America, introduced also in Mexico (Sinaloa), Central America (Honduras), Europe, Asia, s Africa, Australia.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Lepidium didymum"
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
Linnaeus +
B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Que. +, Ala. +, Ariz. +, Ark. +, Calif. +, Conn. +, Fla. +, Ga. +, La. +, Maine +, Md. +, Mass. +, Miss. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +, Wis. +, South America +, introduced also in Mexico (Sinaloa) +, Central America (Honduras) +, Europe +, Asia +, s Africa +  and Australia. +
0-1000 m +
Roadsides, waste areas, lawns, pastures, fields, gardens, disturbed areas +
Flowering Mar–Jul. +
Syst. Nat. ed. +  and Mant Pl. +
Carara didyma +, Coronopus didymus +, Senebiera didyma +, Senebiera incisa +  and Senebiera pinnatifida +
Lepidium didymum +
Lepidium +
species +