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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.
Stems

erect or spreading.

Leaves

mostly opposite;

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

Peduncles

20–100 mm, puberulent or glabrous.

Involucres

obconic to campanulate or hemispheric, 4–6 mm.

Ray florets

(8–)12–21;

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).

Phyllaries

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

Calyculi

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

Cypselae

2–3 mm;

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

Thymophylla pentachaeta

Discussion

Varieties 4 (4 in the flora).

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

Distribution
from FNA
AZ; CA; NM; NV; TX; UT; Mexico [Introduced(?) in South America (Argentina)]
[WildflowerSearch map]
[BONAP county map]
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
Key
1.Involucres cylindric, 2–3.5 mm diam.; disc florets 16–40T. pentachaeta 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 basesT. pentachaeta 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 hairyT. pentachaeta var. pentachaeta
3.Leaf lobes mostly 5–7(–10); phyllaries densely puberulentT. pentachaeta var. puberula
Synonyms Hymenatherum pentachaetum, Dyssodia pentachaeta
Name authority (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903)
Source Flora of North America vol. 21, p. 241.
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