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