Lepidium austrinum

Small

Fl. S.E. U.S., 468, 1331. 1903.

WeedyIllustrated
Synonyms: Lepidium austrinum var. orbiculare Thellung Lepidium lasiocarpum var. orbiculare (Thellung) C. L. Hitchcock
Treatment appears in FNA Volume 7. Treatment on page 576. Mentioned on page 573.

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. Fruiting pedicels usually divaricate, rarely horizontal, straight or slightly recurved, (terete), (2.5–)3–4.1(–4.7) × 0.2 mm, puberulent adaxially. 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. 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.


Phenology: Flowering Mar–Jun.
Habitat: Disturbed grounds, railroad tracks and embankments, fields, knolls, stream banks, waste areas, open banks, roadsides, sandy terraces

Distribution

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Kans., La., Miss., N.Mex., Okla., Tex., Mexico (Coahuila, Nuevo León, San Luis Potosí).

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Lepidium austrinum"
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
Kans. +, La. +, Miss. +, N.Mex. +, Okla. +, Tex. +, Mexico (Coahuila +, Nuevo León +  and San Luis Potosí). +
Disturbed grounds, railroad tracks and embankments, fields, knolls, stream banks, waste areas, open banks, roadsides, sandy terraces +
Flowering Mar–Jun. +
Fl. S.E. U.S., +
Weedy +  and Illustrated +
Lepidium austrinum var. orbiculare +  and Lepidium lasiocarpum var. orbiculare +
Lepidium austrinum +
Lepidium +
species +