Flora of North America species comparison

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Packera breweri

Packera castoreus

Brewer's ragwort

beaver mountain ragwort
Habit Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). Perennials, 3–9+ cm; usually fibrous-rooted, sometimes rhizomatous (bases erect or ascending, branched).
Stems

1, glabrous or leaf axils tomentose.

1 or 2–3, (white) woolly-tomentose.
Basal leaves

(and proximal cauline) petiolate;

blades spatulate to obovate (pinnately lobed, terminal lobes ovate to oblong, lateral lobes 2–6+ pairs, smaller, midribs narrowly winged), 100–300+ × 20–50(–80+) mm, bases contracted to tapering, ultimate margins crenate or dentate to lacerate (faces glabrous).

(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; obovate, irregularly incised to subpinnate, terminal lobes narrow).

gradually reduced (becoming sessile and bractlike).
Peduncles

usually ebracteate (rarely with 1–2 bractlets), glabrous.

ebracteate.
Ray florets

8–10+;

corolla laminae 10–15+ mm.

0.
Disc florets

45–60+;

corolla tubes 3–3.5 mm, limbs 4–4.5 mm.

not seen.
Phyllaries

13 or 21, green, 7–9+ mm, glabrous.

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

inconspicuous.

inconspicuous.
Heads

15–50+ in corymbiform arrays.

1–4+, in corymbiform arrays.
Cypselae

2–2.5 mm, glabrous;

pappi 6–7 mm.

not seen (reported to be glabrous).
2n

= 46.

Packera breweri

Packera castoreus
Phenology Flowering mid Apr–late May. Flowering late Jul–late Sep.
Habitat Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas Ridges, spruce-fir communities, igneous soils
Elevation 200–1500 m (700–4900 ft) 3300–3900 m (10800–12800 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
UT
[BONAP county map]
Discussion

Packera breweri is known only from Coast Ranges from San Francisco Bay to Los Angeles County and along the eastern edges of the San Joaquin Valley. Populations are relatively small and sporadic; the plants appear not to hybridize with other species of Packera.

(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. 580. 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. 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. quercetorum, 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 breweri Senecio castoreus
Name authority (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) (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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