6.
Gutierrezia sarothrae
(Pursh) Britton & Rusby, Trans. New York Acad. Sci. 7: 10. 1887.
Kindlingweed
Solidago sarothrae
Pursh, Fl. Amer. Sept. 2: 540. 1813;
Xanthocephalum sarothrae
(Pursh) Shinners
Subshrubs,
10—60(—100) cm.
Stems
minutely hispidulous.
Leaves:
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.
Heads
(sessile to subsessile in compact glomerules) in dense, flat-topped, corymbiform arrays.
Involucres
cylindric to cuneate-campanulate, 1.5—2(—3) mm diam.
Phyllary apices
flat.
Ray florets
(2—)3—8; corollas yellow, 3—5.5 mm.
Disc florets
(2—)3—9 (usually bisexual and fertile, rarely functionally staminate, corollas tubular-funnelform, lobes erect to spreading or recurved, deltate).
Cypselae
0.8—1.6(—2.2) mm, faces without oil cavities, densely strigoso-sericeous;
pappi
of 1—2 series of narrowly oblong- to ovate-lanceolate or obovate scales (readily falling, those of discs
1
/ 3 —
1
/ 2 corollas, shorter on rays).
2
n
= 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).
Gutierrezia sarothrae
is often abundant in overgrazed pastures; it is naturalized in New York.
