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This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all
Federal and State Noxious Weeds
This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of
Weeds of the U.S.
Linnaeus, Sp. Pl. 2: 644. 1753.
(rhizomes thick, caudex woody); glabrous or pubescent.
simple from base, erect, branched distally, (2-)3.5-12(-15) dm.
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.
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.
(subcorymbose panicles), slightly elongated or not in fruit; rachis glabrous or sparsely puberulent, trichomes straight, cylindrical.
ascending to divaricate, straight or slightly curved, (terete), 2-5(-6) × 0.1-0.2 mm, glabrous or puberulent adaxially.
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.
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).
oblong, (0.8-)1-1.2 × 0.6-0.9 mm.
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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