Flora of North America species comparison

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Hazardia squarrosa

Hazardia detonsa

saw-tooth bristleweed, saw-tooth goldenbush

island bristleweed, 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 obovate, 40–140 × 10–50 mm, subcoriaceous, bases not clasping, margins serrulate to subentire, abaxial faces densely lanate-tomentose, adaxial densely short-tomentose.
Involucres

turbinate, 8–16 × 7–10 mm.

campanulate, 10–13 × 10–13 mm.
Ray florets

0.

6–14, fertile;

corollas shorter than involucre, inconspicuous.
Disc florets

9–30;

corollas 9–11 mm.

30–40;

corollas 8–10 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 densely woolly.
Heads

borne in racemo-spiciform or glomerate-spiciform arrays.

in thyrsiform to subcorymbiform heads.
Cypselae

5–8 mm, glabrous.

3–4 mm, canescent.
2n

= 10.

Hazardia squarrosa

Hazardia detonsa
Phenology Flowering Apr–Nov.
Habitat Open, rocky hillsides, canyon walls, often with Pinus, Quercus, Ceanothus, Rhus, Arctostaphylos
Elevation 10–300 m (0–1000 ft)
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Hazardia detonsa is known from Anacapa, Santa Rosa, and Santa Cruz islands. It is little differentiated from H. cana and clearly its evolutionary sister. In both taxa, the ray and disc florets often change to red-purple with maturity.

(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. cana, 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 Corethrogyne detonsa, Haplopappus detonsus
Name authority (Hooker & Arnott) Greene: Erythea 2: 112. (1894) (Greene) Greene: Pittonia 1: 29. (1887)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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