Packera streptanthifolia
Packera eurycephala
cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel
cut-leaf butterweed, wide-head groundsel
1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils.
1 or, usually, multiple, clustered, densely tomentose to glabrescent.
(and proximal cauline, relatively thick and turgid) petiolate;
blades spatulate to oblanceolate, or ovate to orbiculate, 20–40+ × 10–30+ mm, bases tapering to abruptly contracted or subcordate, margins entire, crenate, dentate, or weakly lobulate (faces usually glabrous, sometimes hairy).
(soon withering), petiolate;
blades lyrate (lateral lobes 2–6+ pairs), ovate, obovate, or spatulate, 70–100+ × 20–30+ mm, bases tapering, ultimate margins irregularly and coarsely serrate-dentate.
gradually to abruptly reduced (± petiolate or sessile; entire or subentire).
gradually reduced (± petiolate, proximal and mid similar to basal, terminal lobes smaller than laterals; distal sessile, incised).
bracteate, glabrous or sparsely tomentose.
bracteate, sparsely to densely lanate-tomentose.
8 or 13;
corolla laminae 5–10 mm.
8 or 13;
corolla laminae 10–15 mm.
35–60+;
corolla tubes 2–4 mm, limbs 2.5–4 mm.
35–50+;
corolla tubes 3.5–4.5 mm, limbs 2.5–3.5 mm.
(8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous.
13 or 21, green (tips sometimes yellow), 8–10+ mm, densely tomentose proximally, glabrescent distally.
conspicuous.
inconspicuous (bractlets tomentose).
2–20+ in loose, corymbiform or subumbelliform arrays.
5–20+ in open or compact (rarely), cymiform arrays.
1–2.5 mm, glabrous;
pappi 3–6 mm.
1–1.5 mm, glabrous;
pappi 6–7 mm.
= 46, 92.
= 46.
Packera streptanthifolia
Packera eurycephala
Packera streptanthifolia is widespread and variable throughout the Western Cordillera. It includes weakly defined phases that have been treated as distinct species or as varieties. Characteristics used to delimit those taxa often overlap and are difficult to score; some “phases” grade into each other. Northern populations are sometimes segregated as a distinct taxon (e.g., Senecio streptanthifolia var. borealis; J. F. Bain 1988).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Stems (1–)2–6; leaf blades: margins usually serrate-dentate, sometimes deeply dissected, midribs winged | var. eurycephala |
1. Stems 1; leaf blades finely dissected, lateral lobes also dissected, midribs not or weakly winged | var. lewisrosei |
BC
OR
WA
CalFlora
Flora NW
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
