Ambrosia acuminata (Brandeg.) W. W. Payne

Franseria acuminata Brand. Proc. Calif. Acad. II. 2: 171
1889.
A perennial, shrubby at least at the base; stem about 6 dm. high, branched above, glabrous or nearly so; leaves mostly alternate, bright-green, very sparingly strigose, 5-8 cm. long, 3-5 cm. wide, ovate-lanceolate or lanceolate in outline, pinnately divided to the midrib into 3-8 pairs of unequal, lanceolate, acuminate divisions, the terminal one long-acuminate; inflorescence racemose-paniculate; staminate heads numerous; involucre turbinate, glabrous, with 5-8 triangular mucronate lobes; paleae of the receptacle minute, somewhat clavate; pistillate heads in small clusters in the upper axils, 1-or 2-flowered; fruit obovoid, about 5 mm. long, glabrous; spines 5-S, very short, rarely more than 0.5 mm. long, incurved, in two series; beak short, conic.
Type locality: Purisima, Lower California.