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Lepidium latifolium
Lepidium latifolium
L.
Family:
Brassicaceae
broadleaved pepperweed,
more...
broad-leaved pepperweed, broadleaf pepperweed, broadleaved peppergrass, peppergrass mustard, perennial peppercress, perennial pepperweed, tall whitetop, Virginia pepperweed
[
Cardaria latifolia
(L.) Spach]
Flora of North America
Resources
Ihsan A. Al-Shehbaz, John F. Gaskin in Flora of North America (vol. 7)
Perennials;
(rhizomes thick, caudex woody); glabrous or pubescent.
Stems
simple from base, erect, branched distally, (2-)3.5-12(-15) dm.
Basal leaves
not rosulate; petiole 1-9 (-14) cm; blade elliptic-ovate to oblong, (2-)3.5-15(-25) cm × (5-)15-50(-80) mm, (leathery), margins entire or serrate.
Cauline leaves
sessile or shortly petiolate; blade oblong to elliptic-ovate or lanceolate, (1-)2-9(-12) cm × 3-45 mm, base cuneate, not auriculate, margins serrate or entire.
Racemes
(subcorymbose panicles), slightly elongated or not in fruit; rachis glabrous or sparsely puberulent, trichomes straight, cylindrical.
Fruiting pedicels
ascending to divaricate, straight or slightly curved, (terete), 2-5(-6) × 0.1-0.2 mm, glabrous or puberulent adaxially.
Flowers:
sepals suborbicular to ovate, 1-1.4 × 0.8-0.9 mm; petals white, obovate, 1.8-2.5 × (0.8-)1-1.3 mm, claw 0.7-1 mm; stamens 6; filaments 0.9-1.4 mm, (glabrous); anthers 0.4-0.5 mm.
Fruits
oblong-elliptic to broadly ovate or suborbicular, (1.6-)1.8-2.4(-2.7) × 1.3-1.8 mm, apically not winged, apical notch 0(-0.1) mm deep; valves thin, smooth, not veined, glabrous or sparsely pilose; style 0.05-0.15 mm, exserted beyond apical notch (when present).
Seeds
oblong, (0.8-)1-1.2 × 0.6-0.9 mm.
2
n
= 24. Flowering Jun-Sep. Pastures, grasslands, disturbed places, fields, roadsides, slopes, saline meadows, stream banks, waste grounds, dry flats, sagebrush and pinyon-juniper communities, barren hillsides, ditch banks, edge of marshes; 0-2500 m; introduced; Alta., B.C., Que.; Ariz., Calif., Colo., Conn., Idaho, Ill., Kans., Mass., Mo., Mont., Nebr., Nev., N.Mex., N.Y., Oreg., Tex., Utah, Wash., Wyo.; s Europe; Asia; n Africa; introduced also in Mexico (Durango, San Luis Potosí), Australia.
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