Flora of North America species comparison

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Packera quercetorum

Packera castoreus

Oak Creek ragwort

beaver mountain ragwort
Habit Perennials, 60–100+ cm; taprooted (caudices subligneous, ascending to erect). Perennials, 3–9+ cm; usually fibrous-rooted, sometimes rhizomatous (bases erect or ascending, branched).
Stems

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, (white) woolly-tomentose.
Basal leaves

(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) petiolate;

blades obovate to oblanceolate or spatulate, 10–20+ × 5–18 mm, bases tapering, margins entire or crenate (abaxial faces densely tomentose, adaxial glabrescent).
Cauline leaves

gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).

gradually reduced (becoming sessile and bractlike).
Peduncles

ebracteate, glabrous.

ebracteate.
Ray florets

(8–)13;

corolla laminae 6–10+ mm.

0.
Disc florets

60–70+;

corolla tubes 2–3 mm, limbs 3.5–4.5 mm.

not seen.
Phyllaries

(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).

purple-tinged, 7–10 mm, tomentose (ciliate distally, apices with dense tufts of hairs).
Calyculi

inconspicuous.

inconspicuous.
Heads

15–40+ in open, cymiform arrays.

1–4+, in corymbiform arrays.
Cypselae

1.5–2 mm, glabrous or ± scabrellous;

pappi 5.5–6.5 mm.

not seen (reported to be glabrous).
2n

= 92.

Packera quercetorum

Packera castoreus
Phenology Flowering mid Apr–early Jun. Flowering late Jul–late Sep.
Habitat Rocky soils, open areas, scrub-oak and pinyon-pine forests, chaparral Ridges, spruce-fir communities, igneous soils
Elevation 800–2200 m (2600–7200 ft) 3300–3900 m (10800–12800 ft)
Distribution
from FNA
AZ; NM
[WildflowerSearch map]
[BONAP county map]
from FNA
UT
[BONAP county map]
Discussion

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.)

Of conservation concern.

Packera castoreus is known only from relatively few collections from the Tushar Mountains in Beaver and Piute counties. Welsh speculated that it may have some affinities with P. cana and P. werneriifolia.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 598. FNA vol. 20, p. 582.
Parent taxa Asteraceae > tribe Senecioneae > Packera Asteraceae > tribe Senecioneae > Packera
Sibling taxa
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Synonyms Senecio quercetorum, Senecio macropus Senecio castoreus
Name authority (Greene) C. Jeffrey: Kew Bull. 47: 101. (1992) (S. L. Welsh) Kartesz: in J. T. Kartesz and C. A. Meacham, Synth. N. Amer. Fl., nomencl. innov. 20. (1999)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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