Thymophylla pentachaeta |
Thymophylla pentachaeta var. pentachaeta |
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five-needle pricklyleaf |
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). |
6–25 mm overall, lobes (3–)9–11, subequal. |
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Peduncles | 20–100 mm, puberulent or glabrous. |
60–100 mm. |
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Involucres | obconic to campanulate or hemispheric, 4–6 mm. |
obconic to campanulate, 4.3–6 × 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). |
50–80. |
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Phyllaries | 12–21, margins of outer distinct 1/5 to nearly all their lengths, abaxial faces puberulent or glabrous. |
12–21, margins of outer distinct ca. 1/2 their lengths, abaxial faces usually glabrescent or glabrous, rarely hairy. |
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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 | of 5 erose scales alternating with 5, 1–3-aristate scales. |
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2n | = 32. |
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Thymophylla pentachaeta |
Thymophylla pentachaeta var. pentachaeta |
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Phenology | Flowering early spring and late summer, following rains. | |||||||||||||
Habitat | Calcareous outcrops and derived soils, scrublands or deserts, roadways, other disturbed sites | |||||||||||||
Elevation | 50–700+ m (200–2300+ ft) | |||||||||||||
Distribution |
AZ; CA; NM; NV; TX; UT; Mexico [Introduced(?) in South America (Argentina)]
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TX; Mexico |
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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 | |||||||||||||
Name authority | (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) | unknown | ||||||||||||
Web links |