Tetraneuris torreyana |
Tetraneuris acaulis |
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stone rubberweed, Torrey's four-nerve daisy |
perky sue, stemless four-nerve daisy, stemless hymenoxys, stemless woollybase |
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Habit | Perennials, 2–15+ cm. | Perennials, 2–30+ cm. | ||||||||||||
Caudices | ± branched, branches notably thickened distally. |
± branched, branches notably thickened distally. |
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Stems | 1–30(–40), erect, unbranched. |
1–35(–60), erect, unbranched. |
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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. |
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. |
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Peduncles | (0.5–)2–15 cm, ± hairy proximally, almost always densely lanate distally. |
0.5–30 cm, ± hairy. |
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Involucres | 10–12 × 12–15 mm. |
7–12 × 8–16 mm. |
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Ray florets | 7–14; corollas 11–17 mm. |
8–15(–21); corollas 9–19 mm. |
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Disc florets | 25–150+; corollas yellow, 4–4.7 mm. |
25–200+; corollas yellow, 2.7–4.3 mm. |
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Outer phyllaries | 4–8, 6–8.5 mm, margins (0.3–)0.5–1.2 mm wide, usually conspicuously scarious, abaxial faces ± hairy. |
6–12, 3.9–9(–11.5) mm, margins 0–0.4 mm wide, sometimes slightly scarious, abaxial faces ± hairy. |
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Heads | 1–10(–40) per plant, borne singly. |
1–35(–60) per plant, borne singly. |
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Cypselae | 3–4 mm; pappi of 5–7 obovate to oblanceolate, aristate scales 3–4(–4.5) mm. |
2–4 mm; pappi of 5–8 obovate to oblanceolate, aristate scales 2.2–3.7 mm. |
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Tetraneuris torreyana |
Tetraneuris acaulis |
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Phenology | Flowering May–Jun(–Sep). | |||||||||||||
Habitat | Roadsides, hillsides, slopes, open treeless areas, edges of woods | |||||||||||||
Elevation | (1300–)1700–3100 m ((4300–)5600–10200 ft) | |||||||||||||
Distribution |
CO; MT; UT; WY
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AZ; CA; CO; ID; KS; MT; ND; NE; NM; NV; OK; SD; TX; UT; WY; AB; SK
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Discussion | Varieties 4 (4 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 451. | FNA vol. 21, p. 451. | ||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Actinella torreyana, Hymenoxys depressa, Hymenoxys lapidicola, Hymenoxys torreyana, T. depressa | Gaillardia acaulis, Hymenoxys acaulis | ||||||||||||
Name authority | (Nuttall) Greene: Pittonia 3: 265. (1898) | (Pursh) Greene: Pittonia 3: 265. (1898) | ||||||||||||
Web links |