Thymophylla pentachaeta
Thymophylla tephroleuca
five-needle pricklyleaf
ashy pricklyleaf
erect or spreading.
erect.
mostly opposite;
blades mostly pinnately lobed, 6–28+ mm overall, lobes 3–11 linear to filiform (usually stiff, setiform).
all or mostly alternate;
blades not lobed, linear to filiform, 10–15 × 0.3–1 mm, margins usually entire, sometimes 3-fid distally.
20–100 mm, puberulent or glabrous.
10–30 mm, tomentose.
obconic to campanulate or hemispheric, 4–6 mm.
campanulate, 5–7 mm.
(8–)12–21;
corollas yellow to orange-yellow, laminae 2–6(–8) × 1–3 mm.
12–13;
corollas golden yellow, laminae 6–8 × 3–4 mm.
16–40 or 50–80;
corollas yellow, 2–4 mm (tending to zygomorphy in peripheral florets in some plants).
ca. 30;
corollas yellow, 4.5–5 mm.
12–21, margins of outer distinct 1/5 to nearly all their lengths, abaxial faces puberulent or glabrous.
12–13, margins of outer distinct less than 1/4 their lengths, abaxial faces tomentose.
0, or of 1–5 deltate bractlets, lengths less than 1/2 phyllaries.
of 3–4 linear bractlets, lengths 1/2+ phyllaries.
2–3 mm;
pappi of 10 erose and/or aristate scales mostly 1–3 mm.
3–4 mm;
pappi of 10–11 subequal scales 4–5 mm (each 3–5-aristate).
= 16.
Thymophylla pentachaeta
Thymophylla tephroleuca
Varieties 4 (4 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Thymophylla tephroleuca probably grows also in adjacent Mexico. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.
(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 |
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
