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five-needle pricklyleaf

Habit Perennials or subshrubs, ± grayish to green, to 15(–25) cm, usually puberulent to canescent, sometimes glabrescent or glabrous.

erect or spreading.


mostly opposite;

blades mostly pinnately lobed, 6–28+ mm overall, lobes 3–11 linear to filiform (usually stiff, setiform).


20–100 mm, puberulent or glabrous.


obconic to campanulate or hemispheric, 4–6 mm.

Ray florets


corollas yellow to orange-yellow, laminae 2–6(–8) × 1–3 mm.

Disc florets

16–40 or 50–80;

corollas yellow, 2–4 mm (tending to zygomorphy in peripheral florets in some plants).


12–21, margins of outer distinct 1/5 to nearly all their lengths, abaxial faces puberulent or glabrous.


0, or of 1–5 deltate bractlets, lengths less than 1/2 phyllaries.


2–3 mm;

pappi of 10 erose and/or aristate scales mostly 1–3 mm.

Thymophylla pentachaeta

from FNA
AZ; CA; NM; NV; TX; UT; Mexico [Introduced(?) in South America (Argentina)]
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Varieties 4 (4 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

1. Involucres cylindric, 2–3.5 mm diam.; disc florets 16–40
var. hartwegii
1. Involucres obconic, campanulate, or hemispheric, mostly 4–5 mm diam.; disc florets 50–80
→ 2
2. Peduncles 20–50 mm; margins of outer phyllaries distinct almost to bases
var. belenidium
2. Peduncles (40–)50–100 mm; margins of outer phyllaries distinct less ca. 1/2 or ca. 1/3 their lengths
→ 3
3. Leaf lobes mostly 9–11; phyllaries usually glabrous or glabrescent, rarely hairy
var. pentachaeta
3. Leaf lobes mostly 5–7(–10); phyllaries densely puberulent
var. puberula
Source FNA vol. 21, p. 241.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla
Sibling taxa
T. acerosa, T. aurea, T. concinna, T. micropoides, T. setifolia, T. tenuiloba, T. tephroleuca
Subordinate taxa
T. pentachaeta var. belenidium, T. pentachaeta var. hartwegii, T. pentachaeta var. pentachaeta, T. pentachaeta var. puberula
Synonyms Hymenatherum pentachaetum, Dyssodia pentachaeta
Name authority (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903)
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