Thymophylla tenuiloba |
Thymophylla tenuiloba var. texana |
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bristleleaf pricklyleaf, Dahlburg-daisy, shooting star |
Texas bristleleaf |
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Habit | Annuals (rarely persisting), green, to 30 cm, glabrous or sparsely hirtellous. | |||||||||||||
Stems | decumbent to erect. |
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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). |
7–15-lobed. |
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Peduncles | 30–80 mm, glabrous or hirtellous. |
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Involucres | obconic, 5–7 mm. |
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Ray florets | 10–21; corollas yellow-orange, laminae 4–10 × 1.5–3 mm. |
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Disc florets | 50–100+; corollas yellow, 2.5–4.5 mm (peripheral ± zygomorphic in some plants). |
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Phyllaries | 12–22, margins of outer distinct less than 1/5 their lengths, abaxial faces glabrous or sparsely hirtellous. |
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Calyculi | of 3–8 deltate to subulate bractlets, lengths less than 1/2 phyllaries. |
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Cypselae | 2–3.5 mm; pappi of erose and/or aristate scales 0.7–3.5 mm. |
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Pappi | of 5–10 lanceolate to muticous scales 0.5–1.2 mm, all erose or 1–3, 1-aristate. |
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2n | = 16. |
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Thymophylla tenuiloba |
Thymophylla tenuiloba var. texana |
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Phenology | Flowering spring and fall. | |||||||||||||
Habitat | Limestone outcrops and derived soils in grasslands | |||||||||||||
Elevation | 800–900 m (2600–3000 ft) | |||||||||||||
Distribution |
TX; n Mexico
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TX; Mexico (Coahuila, Nuevo León) |
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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. 242. | FNA vol. 21, p. 244. | ||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla > Thymophylla tenuiloba | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Hymenatherum tenuilobum, Dyssodia tenuiloba | Dyssodia texana, Dyssodia tenuiloba var. texana | ||||||||||||
Name authority | (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) | (Cory) Strother: Sida 11: 378. (1986) | ||||||||||||
Web links |