Thymophylla pentachaeta |
Thymophylla pentachaeta var. belenidium |
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five-needle pricklyleaf |
five needled thymophylla, fiveneedle pricklyleaf |
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Habit | Perennials or subshrubs, ± grayish to green, to 15(–25) cm, usually puberulent to canescent, sometimes glabrescent or glabrous. | |||||||||||||
Stems | erect or spreading. |
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Leaves | mostly opposite; blades mostly pinnately lobed, 6–28+ mm overall, lobes 3–11 linear to filiform (usually stiff, setiform). |
10–20 mm overall, lobes 3–7, subequal. |
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Peduncles | 20–100 mm, puberulent or glabrous. |
20–50 mm. |
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Involucres | obconic to campanulate or hemispheric, 4–6 mm. |
obconic to campanulate, 4.5–6 × 4–5 mm. |
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Ray florets | (8–)12–21; corollas yellow to orange-yellow, laminae 2–6(–8) × 1–3 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). |
50–70. |
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Phyllaries | 12–21, margins of outer distinct 1/5 to nearly all their lengths, abaxial faces puberulent or glabrous. |
ca. 13, margins of outer distinct almost to bases, abaxial faces glabrous (margins ciliate). |
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Calyculi | 0, or of 1–5 deltate bractlets, lengths less than 1/2 phyllaries. |
of 3–5 bractlets. |
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Cypselae | 2–3 mm; pappi of 10 erose and/or aristate scales mostly 1–3 mm. |
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Pappi | usually of 10, 3-aristate scales, sometimes of 5 muticous scales alternating with 5, 3-aristate scales. |
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2n | = 32 (Argentina). |
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Thymophylla pentachaeta |
Thymophylla pentachaeta var. belenidium |
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Phenology | Flowering spring–summer. | |||||||||||||
Habitat | Sandy or rocky soils of desert washes and fans, commonly with limestone, often ruderal along roadways | |||||||||||||
Elevation | 500–2500+ m (1600–8200+ ft) | |||||||||||||
Distribution |
AZ; CA; NM; NV; TX; UT; Mexico [Introduced(?) in South America (Argentina)]
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AZ; CA; NM; NV; TX; UT; Mexico; South America (Argentina) |
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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. 241. | FNA vol. 21, p. 242. | ||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla > Thymophylla pentachaeta | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Hymenatherum pentachaetum, Dyssodia pentachaeta | Dyssodia belenidium, Dyssodia pentachaeta var. belenidium, Dyssodia thurberi | ||||||||||||
Name authority | (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) | (de Candolle) Strother: Sida 11: 377. (1986) | ||||||||||||
Web links |