Saw-tooth bristleweed

Haplopappus squarrosus Hooker & Arnott, Bot. Beechey Voy., 146. 1833 (as Aplopappus)

Shrubs, 30–250 cm. Stems usually sparsely tomentose or pilose. Leaves sessile; blades oblong or oblong-obovate to widely obovate, 13–35(–50) × 5–17(–24) mm, coriaceous, bases clasping to subclasping, margins spinulose-dentate (teeth in 3–13 pairs), adaxial faces glabrous to sparsely puberulent. Heads borne in racemo-spiciform or glomerate-spiciform arrays. Involucres turbinate, 8–16 × 7–10 mm. Phyllaries apically spreading to reflexed, oblong, apices with green area 1–2 mm, faces prominently stipitate-glandular (at least apically). Ray florets 0. Disc florets 9–30; corollas 9–11 mm. Cypselae 5–8 mm, glabrous.

Varieties 3 (3 in the flora): California, nw Mexico.