Thymophylla pentachaeta
five-needle pricklyleaf
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.
(8–)12–21;
corollas yellow to orange-yellow, laminae 2–6(–8) × 1–3 mm.
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
Varieties 4 (4 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
AZ; CA; NM; NV; TX; UT; Mexico [Introduced(?) in South America (Argentina)]
| 1. | Involucres cylindric, 2–3.5 mm diam.; disc florets 16–40 | T. 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 bases | T. 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 hairy | T. pentachaeta var. pentachaeta |
| 3. | Leaf lobes mostly 5–7(–10); phyllaries densely puberulent | T. pentachaeta var. puberula |
Flora of North America
WildflowerSearch
iNaturalist
USDA Plants Database
