Hymenoxys cooperi (A. Gray) Cockerell
Family: Asteraceae
Cooper's rubberweed,  more...
[Actinella richardsonii var. canescens Eaton,  more]
Hymenoxys cooperi image
Max Licher  
Biennials or perennials, (10-)20-80(-100) cm (monocarpic; sometimes with sparingly branched, woody caudices). Stems 1-3(-15), usually purple-red-tinted proximally, sometimes purple-red-tinted throughout, branched distally, ± hairy. Leaves: blades simple or lobed (lobes 3-9), ± hairy, gland-dotted (basal leaf bases ± long-villous-woolly); mid leaves lobed (lobes 3-5, terminal lobes 1-2.5 mm wide). Heads (1-)7-45(-80) per plant, in paniculiform to corymbiform arrays. Peduncles (2-)3.5-8(-13) cm, ± hairy. Involucres subhemispheric to hemispheric, 8-10 × 10-17 mm. Phyllaries in 2 series, unequal; outer 8-15, basally connate 1/3-1/2 their lengths (moderately to strongly keeled), lanceolate, 4.5-8.9 mm, apices acuminate to acute; inner 14-22, obovate to oblanceolate, 4.1-6.8 mm, apices acuminate to mucronate. Ray florets 9-14; corollas yellow, 10.2-17(-21.5) × 4-7.5(-9.2) mm. Disc florets 30-150+; corollas 2.7-4.8 mm. Cypselae narrowly obpyramidal, 1.7-3.7 mm; pappi of 5-6(-8) obovate, aristate scales 1.3-3.3 mm. 2n = 30. Flowering May-Jun(-Sep). Roadsides, open areas, edges of juniper-pine forests; (1000-)1500-2500(-3500) m; Ariz., Calif., Idaho, Nev., Oreg., Utah. Some plants of Hymenoxys cooperi, mostly 10-40 cm with mostly 1-6 heads, have been called var. canescens.

General: Biennial or short-lived perennial, 10-100 cm tall; stems 1 to several, erect, branched above, often tinged purple- red at the base or throughout, nearly glabrous or bearing fine white hairs; caudex woody, sparingly branched; taprooted. Leaves: Basal and cauline, alternate, simple or lobed (lobes 3- 9), 2-10 cm long, gradually reduced above, the lobes linear, the terminal one 0.5-2 mm wide, more-or-less hairy and gland-dotted. Flowers: Heads solitary, occasionally in panicle-like arrays; peduncles more-or-less hairy, densely tomentose below the heads; involucre hemispheric to broadly campanulate, 13- 20 mm long, 23-32 mm wide, occasionally silky-villous; phyllaries in 2 series, unequal, the outer series connate only slightly (for about 1/5 their length); ray flowers 13-15, 13-26 mm long, yellowish; disk flowers 100-250 or more, 5.7-7.4 mm long, yellow; flowers April-October. Fruits: Achene, narrowly obpyramidal, 1.7-3.7 mm long, densely pubescent; pappus of 5-6 obovate, bristle-like scales. Ecology: Dry, open slopes, ridges, roadsides, edges of juniper- pine forests, often in sandy soil; 600-2400 m (2000-8000 ft); Coconino, Mohave, and Yavapai counties; western U.S. Notes: Hymenoxys lemmonii (Lemmon-s rubberweed) is similar to H. cooperi, but is distinguished by having somewhat succulent and glabrous to sparsely hairy gland-dotted leaves. Uncommon in our range, it can be found in moist alkaline meadows. The Hopi make tea, dye, and prayer sticks from H. cooperi. Editor: Springer et al. 2008
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Gregory Gust  
Hymenoxys cooperi image
Gregory Gust  
Hymenoxys cooperi image
Gregory Gust  
Hymenoxys cooperi image
Gregory Gust  
Hymenoxys cooperi image
Max Licher  
Hymenoxys cooperi image
Gregory Gust  
Hymenoxys cooperi image
Gregory Gust  
Hymenoxys cooperi image
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. Eastern Nevada Landscape Coalition  
Hymenoxys cooperi image
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. Eastern Nevada Landscape Coalition  
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