Thymophylla tenuiloba |
Thymophylla |
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bristleleaf pricklyleaf, Dahlburg-daisy, shooting star |
pricklyleaf |
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Habit | Annuals (rarely persisting), green, to 30 cm, glabrous or sparsely hirtellous. | Annuals, perennials, subshrubs, or shrubs, (1–)5–30 cm. | ||||||||||||||||||||||||||||||||||||||||
Stems | decumbent to erect. |
erect to spreading or decumbent, branched from bases or ± throughout. |
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Leaves | 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). |
cauline; opposite or alternate; petiolate or sessile; blades often pinnately lobed, blades or lobes spatulate to linear or filiform, ultimate margins entire or toothed, faces glabrous or arachnose, canescent, floccose, lanate, puberulent, or tomentose (bases little, if at all, bristly-ciliate, oil-glands scattered in laminae or submarginal). |
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Peduncles | 30–80 mm, glabrous or hirtellous. |
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Involucres | obconic, 5–7 mm. |
campanulate to obconic, 2–7 mm diam. |
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Receptacles | convex, smooth or ± pitted, epaleate. |
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Ray florets | 10–21; corollas yellow-orange, laminae 4–10 × 1.5–3 mm. |
usually 5, 8, 13, or 21, pistillate, fertile; corollas usually yellow to orange, rarely white. |
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Disc florets | 50–100+; corollas yellow, 2.5–4.5 mm (peripheral ± zygomorphic in some plants). |
16–100+, bisexual, fertile; corollas yellow to orange, tubes shorter than ± cylindric throats, lobes 5, deltate. |
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Phyllaries | 12–22, margins of outer distinct less than 1/5 their lengths, abaxial faces glabrous or sparsely hirtellous. |
persistent, 8–13(–22) in ± 2 series (strongly connate 2/3–7/8+ their lengths, seldom with outer margins distinct more than 1/2 their lengths, exceptions: T. aurea, T. pentachaeta var. belenidium), usually bearing oil-glands. |
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Calyculi | of 3–8 deltate to subulate bractlets, lengths less than 1/2 phyllaries. |
0 or of 1–8 deltate to linear bractlets (bearing oil-glands). |
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Heads | usually radiate, sometimes discoid or radiant, borne singly. |
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Cypselae | 2–3.5 mm; pappi of erose and/or aristate scales 0.7–3.5 mm. |
obpyramidal, obconic, or cylindro-clavate, glabrous or sparsely strigillose; pappi persistent, coroniform or of 10(–20) distinct scales (each scale erose, or 1–5-aristate, or a fascicle of 5–9 basally connate bristles). |
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x | = 8. |
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Thymophylla tenuiloba |
Thymophylla |
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Distribution |
TX; n Mexico
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sw United States; Mexico [Introduced in West Indies, South America, Asia, Africa] |
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Discussion | Varieties 4 (4 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species 13 (8 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. 242. | FNA vol. 21, p. 239. | ||||||||||||||||||||||||||||||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla | Asteraceae > tribe Heliantheae > subtribe Pectidinae | ||||||||||||||||||||||||||||||||||||||||
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Synonyms | Hymenatherum tenuilobum, Dyssodia tenuiloba | Dyssodia section Gnaphalopsis, Dyssodia section Hymenatherum, Hymenatherum | ||||||||||||||||||||||||||||||||||||||||
Name authority | (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) | Lagasca: Gen. Sp. Pl., 25. (1816) | ||||||||||||||||||||||||||||||||||||||||
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