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rush bristleweed, rush-like bristleweed

Habit Subshrubs, 25–100 cm; caudices branched, taproots 2–10+ cm.
Stems

3–15+, branched in distal 1/2, slender and wiry, glabrous.

Leaves

basal often withering by flowering, 20–35 × 6–12 mm, pinnatifid;

cauline evenly spaced, blades oblong to linear, scalelike, 4–6 × 1–2 mm (except proximalmost), markedly reduced distally, margins usually entire, faces glabrous.

Peduncles

minutely glandular, if stipitate, then minutely so;

bracts 5–25, imbricate, grading into phyllaries.

Involucres

hemispheric (narrowed at bases), 0.5–0.8 × 1–1.2 cm.

Ray florets

15–25;

corollas yellow, tubes 3.5–4 mm, laminae 5–6 × 1.5–2.5 mm.

Disc florets

25–40+;

corollas 4.8–6.3 mm.

Phyllaries

in 5–6 series, oblong to linear-oblanceolate, 1.5–6.5 mm, apices acute, tipped by white bristle, faces minutely stipitate-glandular.

Cypselae

narrowly obovoid to oblanceoloid, 1.5–2.5 mm, nerves 12–18, moderately tawny hairy;

pappi tawny, 3.5–6 mm, a few abaxial bristles to 1/3 of longest.

2n

= 8, 16.

Xanthisma junceum

Phenology Flowering summer–fall.
Habitat Rocky, dry slopes
Elevation 100–1000 m [300–3300 ft]
Discussion

Xanthisma junceum is reported from Arizona, but no specimen has been seen; as it is coastal in distribution, the report is likely based on a misidentified specimen.

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

Distribution
from FNA
CA; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Astereae > Xanthisma > sect. Sideranthus
Sibling taxa
X. blephariphyllum, X. coloradoense, X. gracile, X. grindelioides, X. gypsophilum, X. spinulosum, X. texanum, X. viscidum
Synonyms Haplopappus junceus, Machaeranthera juncea
Name authority (Greene) D. R. Morgan & R. L. Hartman: Sida 20: 1406. (2003)
Source Flora of North America vol. 20, p. 390.
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