Thymophylla pentachaeta
Thymophylla acerosa
five-needle pricklyleaf
pricklyleaf dogweed
erect or spreading.
erect (branched from bases).
mostly opposite;
blades mostly pinnately lobed, 6–28+ mm overall, lobes 3–11 linear to filiform (usually stiff, setiform).
mostly opposite;
blades not lobed, linear to acerose, 10–18 mm.
20–100 mm, puberulent or glabrous.
0–10 mm, puberulent or glabrous.
obconic to campanulate or hemispheric, 4–6 mm.
campanulate to cylindric, 5–7 mm.
(8–)12–21;
corollas yellow to orange-yellow, laminae 2–6(–8) × 1–3 mm.
7–8;
corollas lemon-yellow, laminae 5–6 × 2–3 mm.
16–40 or 50–80;
corollas yellow, 2–4 mm (tending to zygomorphy in peripheral florets in some plants).
18–25+;
corollas pale yellow, 3–4 mm.
12–21, margins of outer distinct 1/5 to nearly all their lengths, abaxial faces puberulent or glabrous.
ca. 13, margins of outer distinct less than 1/6 their lengths, abaxial faces puberulent or glabrous.
0, or of 1–5 deltate bractlets, lengths less than 1/2 phyllaries.
of 5 lance-linear bractlets, lengths 1/2+ phyllaries.
2–3 mm;
pappi of 10 erose and/or aristate scales mostly 1–3 mm.
3–3.5 mm;
pappi of ca. 20 scales (each a fascicle of 3–5 bristles), 3–4 mm.
= 16, 24.
Thymophylla pentachaeta
Thymophylla acerosa
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 |
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
