Heterotheca pumila (Greene) J. C. Semple

Heterotheca pumila grows in subalpine and alpine sites in Colorado, southeastern Utah (Lasalle Mountains), and southern Wyoming, where it is very rare. It is most similar to H. villosa var. minor, which in the range of sympatry has larger heads but smaller distal cauline leaves than are typically found in H. pumila. Reports of occurrence of H. pumila from Arizona and New Mexico are based on narrow-leaved plants of H. fulcrata var. amplifolia with small ovate-lanceolate bracts subtending the heads.

Perennials, (7–)12.5–30(–38) cm; taprooted. Stems 1–75+, decumbent to ascending or erect (sometimes reddish brown), moderately appressed-strigose, sparsely long-hirsute. Leaves: proximal cauline petiolate, blades narrowly oblanceolate, 25–56 × 4–9 mm, not stiff, bases attenuate, margins flat, entire, strigoso-ciliate, with a few, proximal, long-hispido-strigose cilia, faces ± densely strigose, sparsely stipitate-glandular; distal cauline sessile, linear-oblanceolate, little reduced to slightly longer distally, surpassing heads, margins entire, rarely slightly undulate, apices acute, faces moderately strigose, sparsely to moderately stipitate-glandular. Heads 1–9(–20), borne singly or in corymbiform arrays. Peduncles 2–10 mm, moderately strigoso-canescent, long-hispid hairs few, sparsely stipitate-glandular; bracts grading from leaves, reduced proximal to heads, those subtending heads usually 1–5, narrowly oblanceolate, (large) 6.5–15 × 0.9–2.5 mm, leaflike. Involucres cylindric to campanulate, (6.3–)7.6–12 mm. Phyllaries in 4–5 series, slightly reddish purple distally, lanceolate, unequal, margins scarious, faces moderately strigose, eglandular or sparsely stipitate-glandular. Ray florets 10–23; laminae (8–)10–15 × 1–2.5 mm. Disc florets (16–)24–60(–73); corollas barely ampliate, 4.6–7.1 mm, throats glabrous, lobes 0.5–1 mm, glabrate (hairs 0.1–0.25 mm). Cypselae monomorphic, obconic, compressed, 1.7–3 mm, ribs 7–11, faces sparsely to moderately strigose; pappi off-white, outer of linear scales 0.25–1 mm, inner of 35–45 bristles 4.7–7 mm, longest attenuate. 2n = 18, 36.

Chrysopsis pumila Greene, Erythea 2: 95. 1894; C. alpicola Rydberg; C. alpicola var. glomerata A. Nelson; C. cooperi A. Nelson

Heterotheca pumila, the alpine goldenaster, is a North American species of flowering plant in the family Asteraceae. It grows in alpine and subalpine regions in the mountains of the western United States. It has been found the Rocky Mountains in Wyoming, Colorado, Utah, and New Mexico.

Heterotheca pumila là một loài thực vật có hoa trong họ Cúc. Loài này được (Greene) Semple mô tả khoa học đầu tiên năm 1987.