Lepidium austrinum |
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southern pepperweed, southern pepperwort |
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Habit | Annuals or biennials; often densely hirsute, (trichomes cylindrical). |
Stems | often simple from base, erect, branched distally, (1.5–)2–6.7(–9.4) dm. |
Basal leaves | (later withered); rosulate; petiole (0.7–)1.5–4.5 cm; blade pinnatifid, 2–8.3 cm × 9–26 mm, margins (of lobes) entire or dentate. |
Cauline leaves | shortly petiolate; blade oblanceolate to nearly linear, 1–4.5(–6.2) cm × 3–10(–17) mm, base attenuate to cuneate, not auriculate, margins entire or dentate. |
Racemes | much-elongated in fruit; rachis pubescent, trichomes curved, with fewer and longer, straight ones. |
Flowers | sepals oblong, 0.8–1 × 0.2–0.4 mm; petals (sometimes absent), white, oblanceolate, 0.4–1.6 × 0.1–0.8 mm, claw absent; stamens 2, median; filaments 0.8–1 mm; anthers 0.1–0.2 mm. |
Fruiting pedicels | usually divaricate, rarely horizontal, straight or slightly recurved, (terete), (2.5–)3–4.1(–4.7) × 0.2 mm, puberulent adaxially. |
Fruits | elliptic-obovate to obovate-orbicular, 2.4–3.2 × 1.8–2.5 mm, apically winged, apical notch 0.2–0.5 mm deep; valves thin, smooth, not veined, sparsely puberulent, (trichomes often antrorsely appressed, sometimes restricted to margin); style 0.05–0.1 mm, included in apical notch. |
Seeds | ovate, 1.4–1.6 × 0.7–0.9 mm. |
Lepidium austrinum |
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Phenology | Flowering Mar–Jun. |
Habitat | Disturbed grounds, railroad tracks and embankments, fields, knolls, stream banks, waste areas, open banks, roadsides, sandy terraces |
Distribution |
KS; LA; MS; NM; OK; TX; Mexico (Coahuila, Nuevo León, San Luis Potosí)
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Source | FNA vol. 7, p. 576. |
Parent taxa | Brassicaceae > tribe Lepidieae > Lepidium |
Sibling taxa | |
Synonyms | L. austrinum var. orbiculare, L. lasiocarpum var. orbiculare |
Name authority | Small: Fl. S.E. U.S., 468, 1331. (1903) |
Web links |