Bigelow's Rubberweed

Perennials, 20–70 cm (polycarpic, often with sparingly branched, woody caudices). Stems 1–5, green throughout or purple-red-tinted distally to throughout, usually unbranched distally, ± hairy (often tomentose proximally). Leaves: blades usually simple, rarely lobed (lobes 3), glabrous or ± hairy, eglandular or sparsely gland-dotted (basal leaf bases ± long-villous-woolly); mid leaves usually simple, rarely lobed (lobes 3, terminal lobes 1.5–3 mm wide). Heads 1–5 per plant, usually borne singly, sometimes in paniculiform arrays. Peduncles (1.5–)6–20(–29) cm, ± hairy, densely tomentose distally near involucres. Involucres hemispheric to broadly campanulate, 13–20 × 23–32 mm. Phyllaries in 2 series, unequal; outer 13–19, basally connate only slightly to ¹/5 their lengths, lanceolate to narrowly lanceolate to obovate to oblanceolate, 7–11 mm, apices acuminate to acute; inner 13–18, narrowly lanceolate to oblanceolate, 8.5–12.6 mm, apices aristate. Ray florets 13–15; corollas yellow, 13–26 × 5.4–9.5 mm. Disc florets 100–250+; corollas 5.7–7.4 mm. Cypselae narrowly obpyramidal, 4.2–4.7 mm; pappi of 9–11(–15) obovate to oblanceolate, often aristate scales 4.7–7.3 mm. 2n = 30.

Actinella bigelovii A. Gray, Smithsonian Contr. Knowl. 5(6): 96. 1853

Macdougalia bigelovii (A. Grav) A. Heller, Bull. Torrev Club
25: 629. ' 1898.
Actinella Bigelovii A. Gray, PI. Wright. 2: 96. 1S53.
A perennial multicipital herb; stems 2-4 dm. high, loosely floccose when young, striate; leaves narrowly linear, 5-10 cm. long, 2-3 mm. wide; peduncles 5-15 cm. long; involucre 110

Hymenoxys bigelovii is a species of flowering plant in the daisy family known by the common name Bigelow's rubberweed . It is native to the states of Arizona, Utah, and New Mexico in the southwestern United States.

Hymenoxys bigelovii is a perennial herb up to 70 cm (28 in) tall. Leaves have very narrow lobes resembling branching threads. One plant will generally produce 1-5 flower heads, each head with 13–15 ray flowers and 100–250 disc flowers.