Pyrrocoma uniflora
one-flower goldenweed, plantain goldenweed, single head pyrrocoma
1–7, curved-ascending to decumbent, red-tinged, sparsely leafy to almost naked, glabrate to lanate or tomentulose, eglandular.
basal petiolate, blades linear to oblanceolate or elliptic, 40–150 × 3–20 mm, margins usually sharply dentate to laciniate, rarely entire;
cauline sessile, few, blades lanceolate, 20–50 × 2–6 mm, bases cordate, clasping;
faces glabrous, sparsely to densely shaggy-tomentose or lanate, eglandular.
2–12 cm.
hemispheric, 6–13 × 10–20 mm.
18–50;
corollas 7–11 mm.
35–60;
corollas 5–8 mm.
in 2 series, appresssed or loose, linear-lanceolate, 6–11 mm, subequal or unequal (sometimes outer ± shorter and green throughout), margins ciliate, faces usually villous to lanate, rarely glabrous.
usually borne singly, sometimes 2–4 in racemiform arrays.
subcylindric, 2–4 mm, obscurely nerved and angled, faces sericeous;
pappi tawny, 5–7 mm.
Pyrrocoma uniflora
Varieties 2 (2 in the flora).
Pyrrocoma uniflora is recognized by its somewhat reduced habit, tomentose leaves and phyllaries, heads borne singly or in small racemes, and sericeous cypselae. It is probably most closely related to P. racemosa.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Stems and leaves tufted-tomentose; involucres 10–13 mm; phyllaries loosely appressed, unequal | var. gossypina |
1. Stems and leaves tomentose to glabrate or glabrous; involucres 6–9 mm; phyllaries appressed, subequal | var. uniflora |
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
