20-70 cm. Stems
glabrous or minutely hispidulous. Leaves:
basal absent at flowering; cauline blades 1-nerved, filiform to linear, 0.5-1(-1.3) mm wide, reduced distally, often reduced in arrays to tiny, curved bracts. Heads
borne singly or (sometimes subsessile and in clusters of 2-3) in loose arrays. Involucres
turbinate to cylindric-turbinate (longer than diams.), 2.5-4 mm diam. Phyllary apices
flat. Ray florets
4-13; corollas yellow, 2.5-7 mm. Disc florets
2-2.8 mm, faces densely strigoso-sericeous; pappi
of 1-2 series of lanceolate to oblanceolate scales 1.5-2.2 mm. 2n
= 16, 24. Flowering Apr-Nov(-Dec). Grassland, chaparral, oak woods, alluvium, rocky slopes, sometimes over serpentine; 100-400 m; Calif.; Mexico (Baja California). Following D. D. Keck (1960) and M. A. Lane (1985), Gutierrezia californica
is treated here as a variable taxon that includes G. divergens.
O. T. Solbrig (1965, 1970) considered G. californica
to be a narrow endemic restricted to serpentine outcrops of the San Francisco Bay region, in which case the earliest name for the more widely distributed plants, including those of Mexico, is G. divergens
Greene. Molecular evidence (Y. Suh and B. B. Simpson 1990) tentatively supports the recognition of the serpentine endemic; more detailed sampling would be needed for an objective decision. The morphologic differences are quantitative and overlapping. Intergrades between G. californica
in the broad sense and G. sarothrae
are said to occur in California (Lane 1993).