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saw-tooth bristleweed, saw-tooth goldenbush

island hazardia, San Clemente Island bristleweed, San Clemente Island hazardia

Habit Shrubs, 30–250 cm. Shrubs, 60–250 cm.
Stems

usually sparsely tomentose or pilose.

lanate-tomentose.

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.

subsessile or subpetiolate;

blades oblanceolate, 4–12 × 1–4 cm, thin, bases not clasping, margins serrulate to subentire, abaxial faces densely short-tomentose, adaxial glabrate or glabrescent.

Involucres

turbinate, 8–16 × 7–10 mm.

broadly turbinate, 7–10 × 5–8 mm.

Ray florets

0.

6–14, fertile;

corollas shorter than involucre, inconspicuous.

Disc florets

9–30;

corollas 9–11 mm.

15–25;

corollas 5–8 mm.

Phyllaries

apically spreading to reflexed, oblong, apices with green area 1–2 mm, faces prominently stipitate-glandular (at least apically).

erect, oblong, apices acute, faces of outer loosely woolly-tufted apically.

Heads

borne in racemo-spiciform or glomerate-spiciform arrays.

in thyrsiform arrays.

Cypselae

5–8 mm, glabrous.

3–4 mm, canescent.

2n

= 10.

Hazardia squarrosa

Hazardia cana

Phenology Flowering Jun–Sep.
Habitat Rocky canyon walls
Elevation 200–500 m (700–1600 ft)
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Hazardia cana is known from San Clemente Island.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Leaves sparsely puberulent, not resinous; involucres 8–12 mm; disc florets 9–16, corollas 9–10 mm
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
var. obtusa
2. Stems distally sparsely hairy or glabrescent; phyllaries recurved, obtuse to acute, glandular
var. squarrosa
Source FNA vol. 20, p. 448. FNA vol. 20, p. 449.
Parent taxa Asteraceae > tribe Astereae > Hazardia Asteraceae > tribe Astereae > Hazardia
Sibling taxa
H. brickellioides, H. cana, H. detonsa, H. orcuttii, H. stenolepis, H. whitneyi
H. brickellioides, H. detonsa, H. orcuttii, H. squarrosa, H. stenolepis, H. whitneyi
Subordinate taxa
H. squarrosa var. grindelioides, H. squarrosa var. obtusa, H. squarrosa var. squarrosa
Synonyms Haplopappus squarrosus Diplostephium canum, Haplopappus canus
Name authority (Hooker & Arnott) Greene: Erythea 2: 112. (1894) (A. Gray) Greene: Pittonia 1: 29. (1887)
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