Tetraneuris acaulis |
Tetraneuris acaulis var. epunctata |
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perky sue, stemless four-nerve daisy, stemless hymenoxys, stemless woollybase |
stemless four-nerve daisy |
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Habit | Perennials, 2–30+ cm. | Plants (2–)6–15(–25+) cm. | ||||||||||||
Caudices | ± branched, branches notably thickened distally. |
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Stems | 1–35(–60), erect, unbranched. |
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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. |
blades oblanceolate to linear-oblanceolate, glabrous or sparsely to moderately hairy (not strigoso-canescent or sericeous), some (usually most or all) eglandular or sparsely gland-dotted. |
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Peduncles | 0.5–30 cm, ± hairy. |
(1–)5–15(–25) cm. |
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Involucres | 7–12 × 8–16 mm. |
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Ray florets | 8–15(–21); corollas 9–19 mm. |
10–14; corollas 11–19 mm. |
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Disc florets | 25–200+; corollas yellow, 2.7–4.3 mm. |
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Outer phyllaries | 6–12, 3.9–9(–11.5) mm, margins 0–0.4 mm wide, sometimes slightly scarious, abaxial faces ± hairy. |
6–12, 5–7.5 mm, margins 0–0.2 mm wide, sometimes slightly scarious, abaxial faces ± hairy. |
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Heads | 1–35(–60) per plant, borne singly. |
1–10(–15) per plant. |
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Cypselae | 2–4 mm; pappi of 5–8 obovate to oblanceolate, aristate scales 2.2–3.7 mm. |
3–4 mm; pappi 2.8–3.7 mm. |
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2n | = 28, 56. |
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Tetraneuris acaulis |
Tetraneuris acaulis var. epunctata |
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Phenology | Flowering May–Jul(–Sep). | |||||||||||||
Habitat | Roadsides, hillsides, edges of woods | |||||||||||||
Elevation | 1600–2700(–3500) m (5200–8900(–11500) ft) | |||||||||||||
Distribution |
AZ; CA; CO; ID; KS; MT; ND; NE; NM; NV; OK; SD; TX; UT; WY; AB; SK
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CO; UT; WY |
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Discussion | Varieties 4 (4 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Some plants of Hymenoxys acaulis from south-central to northeastern Utah and northwestern Colorado have moderately gland-dotted leaf blades. We interpret them to be intermediates between var. epunctata and var. arizonica. Plants referable to var. epunctata have eglandular or very sparsely gland-dotted blades; those referable to var. arizonica have densely gland-dotted blades. (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. 453. | ||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris > Tetraneuris acaulis | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Gaillardia acaulis, Hymenoxys acaulis | T. epunctata, Hymenoxys acaulis var. epunctata, T. crandallii | ||||||||||||
Name authority | (Pursh) Greene: Pittonia 3: 265. (1898) | (A. Nelson) Kartesz & Gandhi: Phytologia 78: 2. (1995) | ||||||||||||
Web links |