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.
basal and proximal absent at flowering; cauline blades 1- or 3-nerved, linear to lanceolate, sometimes filiform and fascicled, 1.5—2(—3) mm wide, little reduced distally.
(sessile to subsessile in compact glomerules) in dense, flat-topped, corymbiform arrays.
cylindric to cuneate-campanulate, 1.5—2(—3) mm diam.
(2—)3—8; corollas yellow, 3—5.5 mm.
(2—)3—9 (usually bisexual and fertile, rarely functionally staminate, corollas tubular-funnelform, lobes erect to spreading or recurved, deltate).
0.8—1.6(—2.2) mm, faces without oil cavities, densely strigoso-sericeous;
of 1—2 series of narrowly oblong- to ovate-lanceolate or obovate scales (readily falling, those of discs
/ 3 —
/ 2 corollas, shorter on rays).
= 8, 16, 32.
Flowering Jul—Nov(—Jan). Grasslands, commonly on rocky, open slopes; 50—2900 m; Alta., Man., Sask.; Ariz., Calif., Colo., Idaho, Kans., Minn., Mont., Nebr., Nev., N.Mex., N.Y., N.Dak., Okla., Oreg., S.Dak., Tex., Utah, Wash., Wyo.; Mexico (Baja California, Baja California Sur, Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Zacatecas).
is often abundant in overgrazed pastures; it is naturalized in New York.
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