Hazardia squarrosa

(Hooker & Arnott) Greene

Erythea 2: 112. 1894

Common names: Saw-tooth bristleweed
Basionyms: Haplopappus squarrosus Hooker & Arnott
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.


Varieties 3 (3 in the flora).




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