Lepidium acutidens

(A. Gray) Howell

Fl. N.W. Amer., 64. 1897.

Illustrated
Basionym: Lepidium dictyotum var. acutidens A. Gray Proc. Amer. Acad. Arts 12: 54. 1877
Synonyms: Lepidium oxycarpum var. acutidens (A. Gray) Jepson
Treatment appears in FNA Volume 7. Treatment on page 575. Mentioned on page 574.

Annuals; hirsute or puberulent. Stems few to several from base, erect to ascending, unbranched, (0.5–) 0.8–3 dm. Basal leaves (soon withered); not rosulate; petiole 1–4 cm; blade linear or pinnatisect, (2–) 2.5–6.1 (–7.2) cm × (0.5–) 1–2 (–3) mm, (lobes linear to narrowly oblong), margins entire. Cauline leaves sessile; blade linear, 1.2–5.8 cm × 0.5–2 (–3) mm, base attenuate, not auriculate, margins entire. Racemes elongated, (dense or lax) in fruit; rachis puberulent or hirsute, trichomes straight, cylindrical. Fruiting pedicels erect to slightly ascending, straight and appressed to rachis or distally slightly recurved, (strongly flattened), (2–) 3–4.2 × 0.4–0.6 mm (width proximal to apex), puberulent throughout. Flowers: sepals oblong to ovate, 0.7–1.1 × 0.2–0.6 mm; petals absent; stamens 4, median; filaments 0.5–1 mm; anthers ca. 0.1 mm. Fruits ovate to ovate-oblong, (3–) 4–6 × 2.5–3.5 mm, apically winged, apical notch (V-shaped), (0.8–) 1–2 mm deep; valves thin, smooth, strongly reticulate-veined, usually glabrous, rarely pubescent; style absent or obsolete, included in apical notch. Seeds ovate, 1.3–2 × 0.8–1.2 mm.


Phenology: Flowering Feb–Apr.
Habitat: Alkaline flats, gullies, or fields, saline vernal flats, grassy fields
Elevation: 0-400 m

Distribution

V7 923-distribution-map.gif

Calif., Oreg., Mexico (Baja California)

Discussion

Lepidium acutidens was treated by C. L. Hitchcock (1936) and R. C. Rollins (1993) as a variety of L. dictyotum. The differences in the fruits as well as the absence of intermediates between them, despite the overlap of their ranges in California, justify their recognition as independent species.

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 acutidens"
oblong +  and ovate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
(A. Gray) Howell +
not auriculate +  and attenuate +
Lepidium dictyotum var. acutidens +
appendaged +  and unappendaged +
6.1 cm61 mm <br />0.061 m <br /> (7.2 cm72 mm <br />0.072 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not +  and auriculate +
1.2 cm12 mm <br />0.012 m <br /> (5.8 cm58 mm <br />0.058 m <br />) +
lobed +, crenate +, serrate +, denticulate +  and dentate +
much smaller +  and reduced +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
differentiated +
emarginate +  and entire +
incumbent +  and accumbent +
Calif. +, Oreg. +  and Mexico (Baja California) +
0-400 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
actinomorphic +
filiform +, linear +, orbicular +, oblanceolate +, oblong +, spatulate +, obovate +, suborbicular +  and ovate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
ovate +  and ovate-oblong +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 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 +
Alkaline flats, gullies, or fields, saline vernal flats, grassy fields +
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 +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering Feb–Apr. +
trinucleate +  and 3(-11)-colpate +
Fl. N.W. Amer., +
stout +  and slender +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
recurved +, erect +  and slightly ascending +
hirsute +  and puberulent +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
mucilaginous +
not winged +, margined +  and winged +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
persistent +  and caducous +
distinct +
ascending +  and spreading +
oblong +  and ovate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
perforated +  and complete +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
Illustrated +
tetradynamous +
prostrate +  and decumbent +
erect +  and ascending +
few +  and several +
entire +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
Lepidium oxycarpum var. acutidens +
Lepidium acutidens +
Lepidium +
species +
cylindrical +
reticulate-veined +
pubescent +  and glabrous +
anastomosing +
puberulent +  and hirsute +
perennial +, biennial +  and annual +
aquatics +  and terrestrial +
pilose +, hirsute +, pubescent +  and glabrous +