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9. Tetraneuris acaulis (Pursh) Greene, Pittonia. 3: 265. 1898.
Gaillardia acaulis Pursh, Fl. Amer. Sept. 2: 743. 1813 (as Galardia); Hymenoxys acaulis (Pursh) K. F. Parker
Perennials, 2–30+ cm. Caudices ± branched, branches notably thickened distally. Stems 1–35(–60), erect, unbranched. Leaves all basal, new leaves tightly clustered; blades spatulate or oblanceolate to linear-oblanceolate, entire, glabrous or ± hairy, often lanuginose, sericeous, or strigoso-canescent, eglandular or ± gland-dotted. Heads 1–35(–60) per plant, borne singly. Peduncles 0.5–30 cm, ± hairy. Involucres 7–12 × 8–16 mm. Outer phyllaries 6–12, 3.9–9(–11.5) mm, margins 0–0.4 mm wide, sometimes slightly scarious, abaxial faces ± hairy. Ray florets 8–15(–21); corollas 9–19 mm. Disc florets 25–200+; corollas yellow, 2.7–4.3 mm. Cypselae 2–4 mm; pappi of 5–8 obovate to oblanceolate, aristate scales 2.2–3.7 mm.
Varieties 4 (4 in the flora): c, w North America.
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| 1 |
Leaves sparsely to densely hairy, often lanuginose, sometimes sericeous, not strigoso-canescent; peduncles 0.5–8(–12) cm; outer phyllaries 6.8–9(–11.5) mm; growing at (2100–)3000–3900 m |
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9a Tetraneuris acaulis var. caespitosa |
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Leaves sparsely to densely hairy, often strigoso-canescent; peduncles (1–)5–20(–30) cm; outer phyllaries 4–7.5 mm; growing at 700–2900(–3500) m |
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(2) |
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| 2 (1) |
Leaf blades usually densely, sometimes sparsely, strigoso-canescent; e of continental divide (except for 2 reports from nw Idaho) |
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9b Tetraneuris acaulis var. acaulis |
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Leaf blades glabrous or sparsely to moderately to sometimes densely hairy, not strigoso-canescent; w of continental divide |
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(3) |
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| 3 (2) |
Leaf blades glabrous or usually sparsely to moderately or sometimes densely hairy, densely gland-dotted; n Arizona, se California, w Colorado, s Idaho, e Nevada, Utah |
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9c Tetraneuris acaulis var. arizonica |
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Leaf blades glabrous or sparsely to moderately hairy, at least some (usually most or all) eglandular or sparsely gland-dotted; w Colorado, c, ne Utah, and sw Wyoming |
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9d Tetraneuris acaulis var. epunctata |
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