Packera quercetorum
Packera contermina
Oak Creek ragwort
dwarf arctic butterweed, high alpine butterweed, northwestern groundsel
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 or 2–3, clustered, bases floccose-tomentose, leaf axils tomentose, glabrous elsewhere.
(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.
(thick, fleshy) petiolate;
blades usually ovate, oblong, or spatulate, sometimes sublyrate, 20–50+ × 20–40+ mm, bases tapering (to winged petioles) or abruptly contracted to subcordate (petioles narrow), margins crenate, coarsely serrate, or subentire.
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
(often cyanic) gradually reduced (sessile, not clasping; lanceolate to linear, usually irregularly and shallowly lobed, rarely entire).
ebracteate, glabrous.
conspicuously bracteate, glabrous.
(8–)13;
corolla laminae 6–10+ mm.
10–12;
corolla laminae 8–14+ mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
55–75+;
corolla tubes 2.5–3.5 mm, limbs 3–4 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
21, deep red or green (tips reddish), 8–12+ mm, white-tomentose proximally.
inconspicuous.
conspicuous (tips of bractlets often purple).
15–40+ in open, cymiform arrays.
1–2(–5+).
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
1–1.25 mm, glabrous;
pappi 4–7 mm.
= 92.
= 160+.
Packera quercetorum
Packera contermina
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 contermina grows in rocky areas and produces relatively short rhizomes and abundant thin fibrous roots. In mesic sites, the rhizomes are more robust and the fibrous roots are fewer. This taxon has been treated as part of P. cymbalaria or P. subnuda. Morphologic and cytologic data lend support to its recognition at species rank.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
BC
WA
Flora NW
PNW Herbaria
