Thymophylla pentachaeta |
Thymophylla tenuiloba |
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five-needle pricklyleaf |
bristleleaf pricklyleaf, Dahlburg-daisy, shooting star |
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Habit | Perennials or subshrubs, ± grayish to green, to 15(–25) cm, usually puberulent to canescent, sometimes glabrescent or glabrous. | Annuals (rarely persisting), green, to 30 cm, glabrous or sparsely hirtellous. | ||||||||||||||||||||||||
Stems | erect or spreading. |
decumbent to erect. |
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Leaves | mostly opposite; blades mostly pinnately lobed, 6–28+ mm overall, lobes 3–11 linear to filiform (usually stiff, setiform). |
mostly alternate (sometimes opposite at 1–3 proximal nodes); blades usually lobed, 12–28 mm overall, lobes 7–15, linear to filiform, pliable (blades mostly not lobed in var. wrightii). |
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Peduncles | 20–100 mm, puberulent or glabrous. |
30–80 mm, glabrous or hirtellous. |
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Involucres | obconic to campanulate or hemispheric, 4–6 mm. |
obconic, 5–7 mm. |
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Ray florets | (8–)12–21; corollas yellow to orange-yellow, laminae 2–6(–8) × 1–3 mm. |
10–21; corollas yellow-orange, laminae 4–10 × 1.5–3 mm. |
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Disc florets | 16–40 or 50–80; corollas yellow, 2–4 mm (tending to zygomorphy in peripheral florets in some plants). |
50–100+; corollas yellow, 2.5–4.5 mm (peripheral ± zygomorphic in some plants). |
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Phyllaries | 12–21, margins of outer distinct 1/5 to nearly all their lengths, abaxial faces puberulent or glabrous. |
12–22, margins of outer distinct less than 1/5 their lengths, abaxial faces glabrous or sparsely hirtellous. |
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Calyculi | 0, or of 1–5 deltate bractlets, lengths less than 1/2 phyllaries. |
of 3–8 deltate to subulate bractlets, lengths less than 1/2 phyllaries. |
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Cypselae | 2–3 mm; pappi of 10 erose and/or aristate scales mostly 1–3 mm. |
2–3.5 mm; pappi of erose and/or aristate scales 0.7–3.5 mm. |
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Thymophylla pentachaeta |
Thymophylla tenuiloba |
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Distribution |
AZ; CA; NM; NV; TX; UT; Mexico [Introduced(?) in South America (Argentina)]
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TX; n Mexico
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Discussion | Varieties 4 (4 in the flora). (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. 241. | FNA vol. 21, p. 242. | ||||||||||||||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla | ||||||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||||||
Subordinate taxa | ||||||||||||||||||||||||||
Synonyms | Hymenatherum pentachaetum, Dyssodia pentachaeta | Hymenatherum tenuilobum, Dyssodia tenuiloba | ||||||||||||||||||||||||
Name authority | (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) | (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) | ||||||||||||||||||||||||
Web links |