Lepidium strictum

(S. Watson) Rattan ex B. L. Robinson

in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 129. 1895.

IntroducedIllustrated
Basionym: Lepidium oxycarpum var. strictum S. Watson in W. H. Brewer et al., Bot. California 1: 46. 1876
Synonyms: Lepidium reticulatum Howell
Treatment appears in FNA Volume 7. Treatment on page 593. Mentioned on page 573.

Annuals; hirsute. Stems often several from base, usually ascending or decumbent to prostrate, rarely erect, branched distally, (0.4–)0.7–1.7(–2) dm. Basal leaves not rosulate; petiole 0.5–3 cm; blade 2-pinnatifid (lobes lanceolate to oblong), 1.5–5.6 cm, margins (of lobes) entire. Cauline leaves shortly petiolate; blade pinnatifid, 0.8–3 cm × 0.3–8 mm, base cuneate to attenuate, not auriculate, margins (of lobes) entire. Racemes elongated, (dense) in fruit; rachis puberulent, trichomes straight, cylindrical. Fruiting pedicels suberect and subappressed at base, recurved and becoming divaricate distally, strongly curved, (often flattened and narrowly winged), (1–)1.4–2.5(–3) × 0.2–0.4 mm, puberulent adaxially. Flowers: sepals (persistent), oblong, 0.7–1(–1.2) × 0.3–0.4 mm; petals (rudimentary), white, linear, 0.2–0.5 × 0.05 mm, claw absent; stamens 2, median; filaments 0.5–0.8 mm; anthers 0.1–0.15 mm. Fruits ovate-orbicular to ovate, 2.5–3.3 × 2–3 mm,apically winged, apical notch 0.3–0.6 mm deep; valves (enclosing seeds), thin, smooth, reticulate-veined, glabrous or puberulent on margin; style obsolete or to 0.1 mm, included in apical notch. Seeds oblong, 1.2–1.6 × 0.7–0.8 mm. 2n = 32.


Phenology: Flowering Apr–Jun.
Habitat: Waste grounds, woodlands, hillsides

Distribution

V7 963-distribution-map.gif

Introduced; Calif., Oreg., South America (Chile).

Discussion

Lepidium strictum was reported from Utah (C. L. Hitchcock 1936) and Colorado (W. A. Weber 1989), but we have been unable to verify those records. The species is easily distinguished by a combination of reticulate-veined fruits, persistent sepals, flattened and narrowly winged fruiting pedicels, and filiform nectaries.

Selected References

None.

Lower Taxa

None.
... more about "Lepidium strictum"
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
(S. Watson) Rattan ex B. L. Robinson +
Lepidium oxycarpum var. strictum +
Calif. +, Oreg. +  and South America (Chile). +
Waste grounds, woodlands, hillsides +
Flowering Apr–Jun. +
in A. Gray et al., Syn. Fl. N. Amer. +
Introduced +  and Illustrated +
Lepidium reticulatum +
Lepidium strictum +
Lepidium +
species +