Hazardia squarrosa

(Hooker & Arnott) Greene
Erythea 2: 112. 1894.
Common names: Saw-tooth bristleweed
Illustrated
Basionym: Haplopappus squarrosus Hooker & Arnott Bot. Beechey Voy., 146. 1833 (as Aplopappus)
Treatment appears in FNA Volume 20. Treatment on page 448. Mentioned on page 446.

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.

Discussion

Varieties 3 (3 in the flora).

Selected References

None.

Key

1 Leaves sparsely puberulent, not resinous; involucres 8–12 mm; disc florets 9–16, corollas 9–10 mm Hazardia squarrosa var. grindelioides
1 Leaves glabrous or sparsely puberulent, resinous; involucres 11–15 mm; disc florets 18–30, corollas 10–11 mm > 2
2 Stems glabrous or scabrous; phyllaries erect, ± obtuse-mucronate, glabrous, resinous Hazardia squarrosa var. obtusa
2 Stems distally sparsely hairy or glabrescent; phyllaries recurved, obtuse to acute, glandular Hazardia squarrosa var. squarrosa