Chrysothamnus viscidiflorus

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. Heads in dense, rounded cymiform arrays (to 7 cm wide), not overtopped by distal leaves. Involucres cylindric to obconic or campanulate, 4–7 × 1.5–2.5 mm. 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. 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). Cypselae tan to reddish brown, turbinate, 2.5–4.2 mm, ± 5-angled, moderately to densely hairy; pappi tan, 3.5–6 mm.

Distribution

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• Legacy Map

B.C., Ariz., Calif., Colo., Idaho, Mont., N.Mex., Nebr., Nev., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Subspecies 5 (5 in the flora).

Selected References

None.

Lower Taxa

Chrysothamnus viscidiflorus subsp. axillaris, Chrysothamnus viscidiflorus subsp. lanceolatus, Chrysothamnus viscidiflorus subsp. planifolius, Chrysothamnus viscidiflorus subsp. puberulus, Chrysothamnus viscidiflorus subsp. viscidiflorus

Key

1	Leaves flat, glabrous; corollas 3.5–4.5 mm; nc Arizona	Chrysothamnus viscidiflorus 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	Chrysothamnus viscidiflorus subsp. lanceolatus
3	Stems and leaves grayish green, densely puberulent; leaves 1–2(–4) mm wide; 1-nerved (sometimes 3-nerved proximally)	Chrysothamnus viscidiflorus subsp. puberulus
4	Leaves 0.5–1 mm wide; florets 3–4(–5); involucres ± turbinate	Chrysothamnus viscidiflorus subsp. axillaris
4	Leaves 1–10 mm wide; if 1 mm wide, involucres narrowly cylindric, and florets 4–14	Chrysothamnus viscidiflorus subsp. viscidiflorus