Lepidium didymum |
Lepidium sordidum |
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lesser pepper-grass, lesser swine-cress, lesser wart-cress |
sordid pepperweed |
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Habit | Annuals; (fetid); glabrous or pilose. | Annuals; puberulent, (trichomes clavate). |
Stems | few to several from base, erect to ascending or decumbent, branched distally, 1–4.5(–7) dm. |
simple or several from base, erect to decumbent, branched (several) distally, 0.5–2.4(–3.2) 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). |
(soon withered); not rosulate; petiole 0.8–2.5 cm; blade 1- or 2-pinnatifid, 3–5.6 cm, margins (of lobes) entire or dentate. |
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. |
petiolate; blade pinnatifid (similar to basal), 0.7–2 cm × 2–10 mm, base attenuate to cuneate, not auriculate, margins dentate to incised or pinnately lobed. |
Racemes | elongated in fruit; rachis glabrous or pubescent, trichomes straight, cylindrical. |
(paniculate), elongated, (often dense) in fruit; rachis puberulent, trichomes straight or curved, clavate. |
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. |
sepals (tardily deciduous), oblong, 0.5–0.7 × 0.3–0.4 mm; petals (absent or rudimentary), white, linear, 0.2–0.4 × 0.05 mm, claw absent; stamens 2, median; filaments 0.5–0.8 mm; anthers 0.1–0.15 mm. |
Fruiting pedicels | divaricate to horizontal, straight slightly recurved, (terete), 1.4–2.5(–4) × 0.15–2 mm, glabrous or sparsely pubescent adaxially. |
ascending to divaricate, straight or slightly recurved, (terete), (1.4–)1.6–2.3(–2.9) × 0.1–0.15 mm, puberulent adaxially. |
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. |
ovate-elliptic, 1.7–2.1 × 1.2–1.6 mm, apically winged, apical notch 0.1–0.2 mm deep; valves thin, smooth, not or weakly veined, glabrous; style 0.1–0.15 mm, included in or equaling apical notch. |
Seeds | ovate, 1–1.2 × 0.7–0.8 mm. |
oblong, 0.8–1 × 0.5–0.6 mm. |
2n | = 32. |
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Lepidium didymum |
Lepidium sordidum |
|
Phenology | Flowering Mar–Jul. | Flowering May–Jul. |
Habitat | Roadsides, waste areas, lawns, pastures, fields, gardens, disturbed areas | Alluvial fans, sandy flats, rocky hillsides, grassy valleys, canyons |
Elevation | 0-1000 m (0-3300 ft) | 1500-1900 m (4900-6200 ft) |
Distribution |
AL; AR; AZ; CA; CT; FL; GA; LA; MA; MD; ME; MO; MS; NC; NJ; NY; OH; OR; PA; SC; TN; TX; VA; WI; WV; BC; NB; NF; NS; QC; South America [Introduced in North America; introduced also in Mexico (Sinaloa), Central America (Honduras), Europe, Asia, s Africa, Australia]
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TX; Mexico (Chihuahua, Durango, Federal District, Hidalgo, Sinaloa, Zacatecas) |
Source | FNA vol. 7, p. 580. | FNA vol. 7, p. 592. |
Parent taxa | Brassicaceae > tribe Lepidieae > Lepidium | Brassicaceae > tribe Lepidieae > Lepidium |
Sibling taxa | ||
Synonyms | Carara didyma, Coronopus didymus, Senebiera didyma, Senebiera incisa, Senebiera pinnatifida | L. granulare |
Name authority | Linnaeus: Syst. Nat. ed. 12, 2: 433. (1767): Mant Pl. 1: 92. (1767) | A. Gray: Smithsonian Contr. Knowl. 3(5): 10. (1852) |
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