Helianthus pumilus Nutt.  
Family: Asteraceae
Helianthus pumilus image
Perennials, 30-100 cm (taproots slightly thickened). Stems erect, hispid or strigose. Leaves cauline; opposite; petioles 0.4-3 cm; blades (ashy green, usually 3-nerved from bases) lanceolate to ovate, 4-15 × 1-5 cm, bases ± cuneate to truncate, margins entire or serrate, faces strigoso-hispid, gland-dotted. Heads 1-6. Peduncles 0.5-5.5 cm. Involucres cylindric, 7-14 mm diam. Phyllaries 15-25 (loosely appressed), lanceolate to ovate, 3.5-7.5 × 2-3.5 mm, apices acute to acuminate, abaxial faces ± hispid or strigose (hairs whitish), gland-dotted. Paleae 7-8 mm, entire or ± 3-toothed (apices acute to acuminate, hispid). Ray florets 8-13; laminae 15-20 mm (abaxial faces gland-dotted). Disc florets 30+: corollas 5-6 mm, lobes yellow; anthers dark brown to black, appendages dark. Cypselae 3-4 mm, sparsely hairy; pappi of 2 aristate scales 4-4.5 mm plus 0-4 deltate scales 0.5-1 mm. 2n = 34. Flowering late summer. Dry, rocky soil in open areas; 1200-2700 m; Colo., Wyo.