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.

Hymenoxys bigelovii là một loài thực vật có hoa trong họ Cúc. Loài này được (A.Gray) K.F.Parker mô tả khoa học đầu tiên năm 1950.