Lepidium draba

Linnaeus

Sp. Pl. 2: 645. 1753.

WeedyIntroducedIllustrated
Synonyms: Cardaria draba (Linnaeus) Desvaux Cochlearia draba (Linnaeus) Linnaeus Nasturtium draba (Linnaeus) Crantz
Treatment appears in FNA Volume 7. Treatment on page 581. Mentioned on page 570, 572.

Perennials; (rhizomatous); hirsute or glabrate. Stems often simple from base, erect or decumbent basally, branched (several) distally, (0.8–) 2–6.5 (–9) dm. Basal leaves (early withered); not rosulate; petiole 1–4 cm; blade obovate, spatulate, or ovate, (1.5–) 3–10 (–15) cm × 10–40 mm, margins sinuate to dentate or entire. Cauline leaves sessile; blade ovate, elliptic, oblong, or lanceolate, oblanceolate, or obovate, (1–) 3–9 (–15) cm × (5–) 10–20 (–50) mm, base sagittate-amplexicaul or auriculate, margins dentate or entire, (surfaces pubescent or glabrous). Racemes (corymbose panicles), slightly or considerably elongated in fruit; rachis glabrous or puberulent, trichomes straight or curved, cylindrical. Fruiting pedicels ascending to horizontal, straight, (terete), 5–10 (–15) × 0.2–0.3 mm, glabrous or sparsely puberulent adaxially. Flowers: sepals oblong to ovate, 1.5–2.5 × 0.7–1.2 mm; petals white, obovate, (2.5–) 3–4 (–4.5) × (1–) 1.3–2 (–2.2) mm, claw 1–1.7 mm; stamens 6; filaments 2–3 mm, (glabrous); anthers 0.4–0.5 mm. Fruits (indehiscent), cordate to subreniform, (2–) 2.5–3.7 (–4.3) × (3.2–) 3.7–5 (–5.6) mm, apically (obtuse to subacute), not winged, apical notch absent; valves thin, smooth, reticulate-veined, glabrous; style (0.6–) 1–1.8 (–2) mm. Seeds ovate, 1.5–2.3 × 1–1.3 mm. 2n = 32, 64.


Phenology: Flowering Apr–Aug.
Habitat: Mountain slopes, roadsides, fields, agricultural lands, stream sides, disturbed grounds, pastures, waste areas
Elevation: 0-3300 m

Distribution

V7 936-distribution-map.gif

Introduced; Alta., B.C., Man., N.S., Ont., Sask., Ariz., Calif., Colo., Conn., D.C., Idaho, Ill., Ind., Iowa, Kans., Md., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.J., N.Mex., N.Y., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.Dak., Utah, Wash., Wyo., s Europe, sw Asia, also in Mexico (Distrito Federal), South America, s Africa, Australia

Discussion

Although Lepidium draba is poorly established and known from old collections in the eastern part of the United States, it has become a noxious weed in several western states.

Lepidium draba and its nearest relatives, L. appelianum and L. chalepense, form a monophyletic clade most closely related to L. campestre (K. Mummenhoff et al. 2001). A. Thellung (1906) and C. L. Hitchcock (1936) correctly placed L. draba in Lepidium, as did Linnaeus. The recognition of the first three species in Cardaria and the maintenance of their nearest relative, L. campestre, in Lepidium do not make any sense on both phylogenetic and taxonomic grounds.

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 draba"
oblong +  and ovate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +  and John F. Gaskin +
Linnaeus +
auriculate +  and sagittate-amplexicaul +
appendaged +  and unappendaged +
9 cm90 mm <br />0.09 m <br /> (15 cm150 mm <br />0.15 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
not +  and auriculate +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
lobed +, crenate +, serrate +, denticulate +  and dentate +
obovate;oblanceolate;lanceolate;oblong;obovate;oblanceolate;lanceolate;oblong;obovate;oblanceolate;lanceolate;oblong;obovate;oblanceolate;lanceolate;oblong;elliptic;ovate;ovate;spatulate;ovate;spatulate;obovate +
much smaller +  and reduced +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
differentiated +
emarginate +  and entire +
incumbent +  and accumbent +
Alta. +, B.C. +, Man. +, N.S. +, Ont. +, Sask. +, Ariz. +, Calif. +, Colo. +, Conn. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.J. +, N.Mex. +, N.Y. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Utah +, Wash. +, Wyo. +, s Europe +, sw Asia +, also in Mexico (Distrito Federal) +, South America +, s Africa +  and Australia +
0-3300 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
actinomorphic +
filiform +, linear +, orbicular +, oblanceolate +, oblong +, spatulate +, obovate +, suborbicular +  and ovate +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.56 cm5.6 mm <br />0.0056 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
cordate +  and subreniform +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.5 cm5 mm <br />0.005 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 +
Mountain slopes, roadsides, fields, agricultural lands, stream sides, disturbed grounds, pastures, waste areas +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
entire +  and dentate +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
rudimentary +
obovate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering Apr–Aug. +
trinucleate +  and 3(-11)-colpate +
stout +  and slender +
puberulent +  and glabrous +
mucilaginous +
not winged +, margined +  and winged +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
persistent +  and caducous +
distinct +
ascending +  and spreading +
oblong +  and ovate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
perforated +  and complete +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
Weedy +, Introduced +  and Illustrated +
tetradynamous +
median +  and lateral +
branched +  and simple +
prostrate +  and decumbent +
decumbent +  and erect +
entire +  and capitate +
subsessile +, sessile +  and petiolate +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
persistent +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
Cardaria draba +, Cochlearia draba +  and Nasturtium draba +
Lepidium draba +
Lepidium +
species +
straight +  and curved +
ascending +  and horizontal +
puberulent +  and glabrous +
cylindrical +
reticulate-veined +
anastomosing +
glabrate +  and hirsute +
perennial +, biennial +  and annual +
aquatics +  and terrestrial +
pilose +, hirsute +, pubescent +  and glabrous +