8. Tetraneuris torreyana (Nuttall) Greene, Pittonia. 3: 265. 1898.
Actinella torreyana Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 379. 1841; Hymenoxys depressa (Torrey & A. Gray) S. L. Welsh & Reveal; H. lapidicola S. L. Welsh & Neese; H. torreyana (Nuttall) K. F. Parker; Tetraneuris depressa (Torrey & A. Gray) Greene
Perennials, 2–15+ cm. Caudices ± branched, branches notably thickened distally. Stems 1–30(–40), erect, unbranched. Leaves all basal, new leaves tightly clustered; blades (midribs usually pronounced) spatulate or oblanceolate to linear-oblanceolate, entire, glabrous or usually sparsely, sometimes moderately to densely, hairy, densely gland-dotted. Heads 1–10(–40) per plant, borne singly. Peduncles (0.5–)2–15 cm, ± hairy proximally, almost always densely lanate distally. Involucres 10–12 × 12–15 mm. Outer phyllaries 4–8, 6–8.5 mm, margins (0.3–)0.5–1.2 mm wide, usually conspicuously scarious, abaxial faces ± hairy. Ray florets 7–14; corollas 11–17 mm. Disc florets 25–150+; corollas yellow, 4–4.7 mm. Cypselae 3–4 mm; pappi of 5–7 obovate to oblanceolate, aristate scales 3–4(–4.5) mm.
Flowering May–Jun(–Sep). Roadsides, hillsides, slopes, open treeless areas, edges of woods; (1300–)1700–3100 m; Colo., Mont., Utah, Wyo.