Parthenium incanum
Parthenium alpinum
mariola
alpine feverfew, Arkansas River feverfew
blades oval-elliptic to obovate, 15–25(–40+) × 6–15(–25+) mm, sometimes pinnately (3–)5–7-lobed or round-toothed, ultimate margins entire, faces tomentose (gray to white) and gland-dotted.
blades oblanceolate to spatulate, 6–18(–35) × 1–3(–4+) mm, margins entire, faces strigilloso-sericeous (gray) and obscurely gland-dotted.
1–3+ mm.
0–5(–30) mm.
5;
corolla laminae ovate, 1–1.5 mm.
5–8;
corolla laminae 0 (tubes ± compressed, obscurely 2–4-lobed).
8–20(–30+).
18–28+.
outer 5 oblong, 1.5–2 mm, inner 5 orbiculate, 2–2.5 mm.
outer 5–8 ± linear, 4 mm, inner 5–8 ± orbiculate, 4–5 mm.
radiate, in glomerules of 3–5+ on branched stalks 1–5(–12+) cm, forming compound, corymbiform arrays.
± disciform, borne singly.
obovoid, 1.5–2 mm; pappus-like enations 2(–3), erect to spreading, ± subulate, 0.5–1 mm.
oblanceoloid, 4 mm (narrowly winged); pappus-like enations 2, erect to spreading, ± subulate, 0.5–1 mm (a third, ± subulate element sometimes at apex of adaxial face).
= 54.
= 36.
Parthenium incanum
Parthenium alpinum
Parthenium alpinum is in the Center for Plant Conservation’s National Collection of Endangered Plants.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
