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green rabbit-brush, sticky-flower rabbitbrush, sticky-leaf rabbit-brush, yellow rabbitbrush

Habit Shrubs, 10–120 cm; with woody, branched caudices, bark whitish tan, becoming gray, flaky and fibrous with age.
Stems

ascending, green, soon becoming tan, glabrous or puberulent, sometimes resin-dotted, often resinous.

Leaves

ascending, spreading, or deflexed;

sessile;

blades with evident midnerves plus sometimes 1–2 pairs of smaller, collateral nerves, linear to lanceolate, 10–75 × 0.5–10 mm, flat or sulcate, often twisted, margins often undulate, sometimes ciliate, apices acute to apiculate, faces glabrous or puberulent.

Involucres

cylindric to obconic or campanulate, 4–7 × 1.5–2.5 mm.

Disc florets

(3–)4–5(–14);

corollas 3.5–6.5 mm, lobes 0.7–1.7 mm;

style branches 2.2–3.2 mm (exserted beyond spreading corolla lobes), appendages 0.8–1.5 mm (length shorter than stigmatic portion).

Phyllaries

12–24 in 3–5 series, in spirals or weak vertical ranks, mostly tan, green to brown subapical patch often present, midnerves usually evident (at least distally), linear-oblong, lanceolate to elliptic or obovate to spatulate, 1–5 × 0.5–1.2 mm, unequal, chartaceous, margins scarious, eciliate or ciliolate to erose-ciliolate, flat or convex, sometimes weakly keeled, apices acute to obtuse or rounded, sometimes apiculate, flat, faces glabrous or puberulent.

Heads

in dense, rounded cymiform arrays (to 7 cm wide), not overtopped by distal leaves.

Cypselae

tan to reddish brown, turbinate, 2.5–4.2 mm, ± 5-angled, moderately to densely hairy;

pappi tan, 3.5–6 mm.

Chrysothamnus viscidiflorus

Distribution
from FNA
AZ; CA; CO; ID; MT; NE; NM; NV; OR; SD; UT; WA; WY; BC
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[BONAP county map]
Discussion

Subspecies 5 (5 in the flora).

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

Parent taxa Asteraceae > tribe Astereae > Chrysothamnus
Sibling taxa
C. depressus, C. eremobius, C. greenei, C. humilis, C. molestus, C. scopulorum, C. stylosus, C. vaseyi
Subordinate taxa
C. viscidiflorus subsp. axillaris, C. viscidiflorus subsp. lanceolatus, C. viscidiflorus subsp. planifolius, C. viscidiflorus subsp. puberulus, C. viscidiflorus subsp. viscidiflorus
Key
1. Leaves flat, glabrous; corollas 3.5–4.5 mm; nc Arizona
subsp. planifolius
1. Leaves twisted or hairy, or corollas 3.5–6.5 mm; w United States
→ 2
2. Distal stems, and frequently leaves, hairy
→ 3
2. Stems glabrous; leaves glabrous, margins ciliate
→ 4
3. Stems greenish, hirtellous to puberulent; leaves green, 3- or 5-nerved, 2–6 mm wide, abaxial faces hirsute to hirtellous, adaxial usually glabrous
subsp. lanceolatus
3. Stems and leaves grayish green, densely puberulent; leaves 1–2(–4) mm wide; 1-nerved (sometimes 3-nerved proximally)
subsp. puberulus
4. Leaves 0.5–1 mm wide; florets 3–4(–5); involucres ± turbinate
subsp. axillaris
4. Leaves 1–10 mm wide; if 1 mm wide, involucres narrowly cylindric, and florets 4–14
subsp. viscidiflorus
Synonyms Crinitaria viscidiflora
Name authority (Hooker) Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 324. (1840)
Source FNA vol. 20, p. 191. Treatment authors: Lowell E. Urbatsch, Roland P. Roberts, Kurt M. Neubig.
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