Lepidium strictum

(S. Watson) Rattan ex B. L. Robinson in A. Gray et al.

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.

"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Lepidium strictum"
oblong +  and ovate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.015 cm0.15 mm <br />1.5e-4 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
(S. Watson) Rattan ex B. L. Robinson in A. Gray et al. +
recurved +, subappressed +  and suberect +
not auriculate +, cuneate +  and attenuate +
Lepidium oxycarpum var. strictum +
appendaged +  and unappendaged +
not +  and auriculate +
0.8 cm8 mm <br />0.008 m <br /> (3 cm30 mm <br />0.03 m <br />) +
lobed +, crenate +, serrate +, denticulate +  and dentate +
pinnatifid;2-pinnatifid +
much smaller +  and reduced +
1.5 cm15 mm <br />0.015 m <br /> (5.6 cm56 mm <br />0.056 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
differentiated +
emarginate +  and entire +
incumbent +  and accumbent +
Calif. +, Oreg. +  and South America (Chile) +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
actinomorphic +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
ovate-orbicular +  and ovate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
terete +, inflated +, angustiseptate +, globose +, obovoid +, ovoid +, orbicular +, elliptic +, obcordate +, cordate +, obovate +, ovate +  and oblong +
terete +, inflated +, angustiseptate +, globose +, obovoid +, ovoid +, orbicular +, elliptic +, obcordate +, cordate +, obovate +, ovate +  and oblong +
Waste grounds, woodlands, hillsides +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
divided;dentate;divided;dentate +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
purple +, pink +, yellow +  and white +
rudimentary +
cruciform +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Apr–Jun. +
trinucleate +  and 3(-11)-colpate +
in A. Gray et al., Syn. Fl. N. Amer. +
stout +  and slender +
mucilaginous +
not winged +, margined +  and winged +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
persistent +  and caducous +
distinct +
ascending +  and spreading +
perforated +  and complete +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
Introduced +  and Illustrated +
tetradynamous +
prostrate +  and decumbent +
erect +  and ascending +
decumbent to prostrate +
entire +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0-0.1 mm +  and obsolete +
Lepidium reticulatum +
Lepidium strictum +
Lepidium +
species +
curved +  and straight +
cylindrical +
reticulate-veined +
puberulent +  and glabrous +
anastomosing +
perennial +, biennial +  and annual +
aquatics +  and terrestrial +
pilose +, hirsute +, pubescent +  and glabrous +