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4l. Hymenopappus filifolius Hooker var. idahoensis B. L. Turner, Rhodora. 58: 250, fig. 28. 1956.
Stems 10–45 cm. Leaves: basal axils ± densely tomentose, terminal lobes 6–30 mm; cauline 0–2. Heads 4–14. Peduncles 1–6 cm. Phyllaries 7–9 mm. Florets 25–70; corollas yellowish, 3.2–4.5 mm, throats 1.5–2 mm, lengths 3–4 times lobes; anthers 2.5–3 mm. Cypselae 4.5–6 mm, hairs 1 mm; pappi 0.6–1.3 mm. 2n = 34.
Flowering Jun–Jul. Gravelly or rocky sites; 1200–1600 m; Idaho.
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