Flora of North America species comparison

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Hazardia squarrosa

Hazardia whitneyi

saw-tooth bristleweed, saw-tooth goldenbush

Whitney's bristleweed, Whitney's goldenbush, Whitney's goldenweed
Habit Shrubs, 30–250 cm. Perennials (from woody rootstocks) or subshrubs, 20–50 cm.
Stems

usually sparsely tomentose or pilose.

scabrid to sparsely tomentulose, distally stipitate-glandular.
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.

sessile;

blades widely oblong to oblanceolate, 25–50 × 7–16 mm, subcoriaceous, bases subclasping (distal), margins serrate, apices acute, faces glabrous, sparsely puberulent, or glandular-scabrid.
Involucres

turbinate, 8–16 × 7–10 mm.

campanulate, 11–13 × 8–12 mm.
Ray florets

0.

0 or 5–18, sterile;

corollas longer than involucres, conspicuous.
Disc florets

9–30;

corollas 9–11 mm.

15–30;

corollas 8–10 mm.
Phyllaries

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

sometimes recurved, linear-lanceolate, apices acute, herbaceous and stipitate-glandular.
Heads

borne in racemo-spiciform or glomerate-spiciform arrays.

borne singly or in spiciform, racemiform, or cymiform arrays.
Cypselae

5–8 mm, glabrous.

5–10 mm, glabrous.

Hazardia squarrosa

Hazardia whitneyi
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Varieties 2 (2 in the flora).

(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
1. Ray florets 0
var. discoidea
1. Ray florets 5–18
var. whitneyi
Source FNA vol. 20, p. 448. FNA vol. 20, p. 447.
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. detonsa, H. orcuttii, H. squarrosa, H. stenolepis
Subordinate taxa
H. squarrosa var. grindelioides, H. squarrosa var. obtusa, H. squarrosa var. squarrosa
H. whitneyi var. discoidea, H. whitneyi var. whitneyi
Synonyms Haplopappus squarrosus Haplopappus whitneyi
Name authority (Hooker & Arnott) Greene: Erythea 2: 112. (1894) (A. Gray) Greene: Pittonia 3: 43. (1896)
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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