Pillar False Gumweed

Chrysothamnus stylosus has been treated previously in the monotypic genus Vanclevea.

Shrubs, 40–120 cm; with woody, freely branched caudices (not readily differentiated from young shoots). Stems green when young, soon becoming tan to white or grayish with age (bark of older stems flaky), branched, resinous when young, less so with age. Leaves ascending to spreading, becoming deflexed; sessile; blades with conspicuous midnerves plus 1–2 pairs of collaterals often evident, lanceolate to linear-elliptic, falcate, 6–35(–60) × 1–9 mm, often folded, margins sometimes undulate, apices acute, mucronate, ± spinulose, faces glabrous, ± gland-dotted, resinous. Heads usually in dense, cymiform arrays (to 7 cm wide), rarely borne singly, not overtopped by distal leaves. Involucres hemispheric, 8–12 × 9–15 mm. Phyllaries 40–60+ in 3–5 series, in spirals, mostly tan, ovate to lanceolate, unequal, 3–10 × 1–1.8 mm, greenish distally but scarcely herbaceous, apices acute or acuminate, often recurved, faces often glutinous. Disc florets 30–40+; corollas 6–8.5 mm, lobes 1–1.7 mm; style branches 2.8–3.5, appendages 1.3–1.7 mm. Cypselae tan, narrowly cylindric, 4–5 mm, glabrous or sparsely hairy, resinous; pappi of 12–15, white or stramineous, lanceolate to lance-linear scales 2–4 mm. 2n = 18.

Grindelia stylosa Eastwood, Proc. Calif. Acad. Sci., ser. 2, 6: 293. 1896; Vanclevea stylosa (Eastwood) Greene

Chrysothamnus stylosus, called pillar false gumweed, or resinbush, is a species of flowering plants in the tribe Astereae within the family Asteraceae. It is native to Arizona and Utah in the southwestern United States.

Chrysothamnus stylosus is a shrub up to 120 cm (48 inches) tall with bark that tends to turn gray and flaky when it gets old. Flower heads are yellow, usually produced in dense arrays of many heads. The species grows on sandy soil in canyonlands and open woodlands.