Packera streptanthifolia
Packera quercetorum
cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel
Oak Creek ragwort
1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils.
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
(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).
(and proximal cauline) petiolate;
blades obovate or lyrate (pinnately lobed, lateral lobes 2–6+ pairs, their bases petioluliform, terminal lobes larger than laterals, midribs narrowly winged), 60–160+ × 20–40+ mm, bases wide, ultimate margins sharply dentate, crenate-dentate, or irregularly incised.
gradually to abruptly reduced (± petiolate or sessile; entire or subentire).
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
bracteate, glabrous or sparsely tomentose.
ebracteate, glabrous.
8 or 13;
corolla laminae 5–10 mm.
(8–)13;
corolla laminae 6–10+ mm.
35–60+;
corolla tubes 2–4 mm, limbs 2.5–4 mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
(8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
conspicuous.
inconspicuous.
2–20+ in loose, corymbiform or subumbelliform arrays.
15–40+ in open, cymiform arrays.
1–2.5 mm, glabrous;
pappi 3–6 mm.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
= 46, 92.
= 92.
Packera streptanthifolia
Packera quercetorum
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.)
Packera quercetorum is found only infrequently and in relatively small populations in central and southern Arizona and west-central New Mexico. The plants are robust and have probable affinities to P. multilobata. The plants have a bluish tinge when freshly collected and are distinctive in the field.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
BC
OR
WA
CalFlora
Flora NW
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
