Packera quercetorum
Packera streptanthifolia
Oak Creek ragwort
cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils.
(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.
(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).
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
gradually to abruptly reduced (± petiolate or sessile; entire or subentire).
ebracteate, glabrous.
bracteate, glabrous or sparsely tomentose.
(8–)13;
corolla laminae 6–10+ mm.
8 or 13;
corolla laminae 5–10 mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
35–60+;
corolla tubes 2–4 mm, limbs 2.5–4 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
(8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous.
inconspicuous.
conspicuous.
15–40+ in open, cymiform arrays.
2–20+ in loose, corymbiform or subumbelliform arrays.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
1–2.5 mm, glabrous;
pappi 3–6 mm.
= 92.
= 46, 92.
Packera quercetorum
Packera streptanthifolia
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.)
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.)
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