Tetraneuris linearifolia |
Tetraneuris acaulis |
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fineleaf fournerve daisy, slimleaf actinea |
perky sue, stemless four-nerve daisy, stemless hymenoxys, stemless woollybase |
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Habit | Annuals, 16–50+ cm. | Perennials, 2–30+ cm. | ||||||||||||||||
Caudices | none. |
± branched, branches notably thickened distally. |
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Stems | 1–10, erect or ± decumbent, leafy, unbranched or branched distally. |
1–35(–60), erect, unbranched. |
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Leaves | basal and cauline, ± hairy, ± gland-dotted; basal blades spatulate to oblanceolate, entire or with 2–6 teeth or lobes; proximal cauline blades narrowly spatulate or oblanceolate to linear-oblanceolate, entire or with 2–6 teeth or lobes; mid blades oblanceolate to linear-oblanceolate to linear, 0.9–9.5(–16) mm wide, entire or with 1–2 teeth or lobes; distal blades narrowly oblanceolate to linear-oblanceolate to linear, entire or with 1–2 teeth or lobes. |
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 | 8–29 cm, ± hairy. |
0.5–30 cm, ± hairy. |
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Involucres | 5–10 × 7–15 mm. |
7–12 × 8–16 mm. |
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Ray florets | 9–25; corollas 8.2–16.8 mm. |
8–15(–21); corollas 9–19 mm. |
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Disc florets | 50–200+; corollas yellow, 1.6–3 mm. |
25–200+; corollas yellow, 2.7–4.3 mm. |
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Outer phyllaries | 8–21, 2.4–5.5 mm, margins 0–0.2 mm wide, not scarious or 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 | 8–50(–80) per plant, borne singly or in corymbiform arrays. |
1–35(–60) per plant, borne singly. |
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Cypselae | 1.5–2.6 mm; pappi of 4–8 obovate, often aristate scales 1–2.5 mm. |
2–4 mm; pappi of 5–8 obovate to oblanceolate, aristate scales 2.2–3.7 mm. |
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Tetraneuris linearifolia |
Tetraneuris acaulis |
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Distribution |
KS; NM; OK; TX; n Mexico
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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 2 (2 in the flora). Plants of Tetraneuris linearifolia morphologically intermediate between the two varieties are found in Bee, Duval, Live Oak, and McMullen counties, Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. 448. | FNA vol. 21, p. 451. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Hymenoxys linearifolia | Gaillardia acaulis, Hymenoxys acaulis | ||||||||||||||||
Name authority | (Hooker) Greene: Pittonia 3: 269. (1898) | (Pursh) Greene: Pittonia 3: 265. (1898) | ||||||||||||||||
Web links |