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Lepidium draba L.
WHITE WEED
Hoary Cress; Cardaria draba L Desv subsp draba; Cardaria draba L Desv

Life   Plantae   Dicotyledoneae   Brassicaceae   Lepidium

Lepidium draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba

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Lepidium draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba
Lepidium draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba

Lepidium draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba
Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba ssp draba

Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba ssp draba
Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba ssp draba

Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba ssp draba
Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba ssp draba

Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 3
Lepidium draba ssp draba
Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 1
Lepidium draba ssp draba

Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 1
Lepidium draba ssp draba
Lepidium draba ssp draba
© Copyright Malcolm Storey 2011-2118 · 1
Lepidium draba ssp draba

Associates · map
FamilyScientific name @ source (records)
Albuginaceae  Albugo candida @ BPI (2)
Andrenidae  Calliopsis personata @ BBSL (2)
Aphididae  Uroleucon ( @ NCSU (1)
Cixiidae  Cixius cultus @ UDCC_TCN (3)

Cixius praecox @ UDCC_TCN (1)
Halictidae  Lasioglossum hitchensi @ AMNH_BEE (1)

Lasioglossum imitatum @ AMNH_BEE (1)

Lasioglossum leucocomum @ AMNH_BEE (2)
Miridae  Orthotylus albocostatus @ AMNH_PBI (5)
Mycosphaerellaceae  Cercospora bixae @ BPI (1)

Cercospora bizzozeriana @ 878750A (1); BPI (6)

Ramularia @ 415815B (1); 415815A (1)

Septoria lepidii @ BPI (11)
Peronosporaceae  Peronospora lepidii-sativi @ BPI (3)

Peronospora parasitica @ BPI (2); 790530A (1)
Pleosporaceae  Alternaria brassicae @ 878750B (1)
Pucciniaceae  Puccinia isiacae @ BPI (1)
Reduviidae  Phymata crassipes @ UCR_ENT (1)
Synchytriaceae  Synchytrium @ BPI (1)

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FNA Vol. 7 Page 570, 572, 578 , 581 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 7 | Brassicaceae | Lepidium

14. Lepidium draba Linnaeus, Sp. Pl. 2: 645. 1753.

Cardaria draba (Linnaeus) Desvaux; Cochlearia draba (Linnaeus) Linnaeus; Nasturtium draba (Linnaeus) Crantz

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. 2 n = 32, 64.

Flowering Apr-Aug. Mountain slopes, roadsides, fields, agricultural lands, stream sides, disturbed grounds, pastures, waste areas; 0-3300 m; 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; introduced also in Mexico (Distrito Federal), South America, s Africa, Australia.

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.

Updated: 2024-06-23 05:53:47 gmt
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