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Brewer's ragwort

New Mexico groundsel

Habit Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). Perennials, biennials, or annuals, 20–50+ cm; fibrous-rooted, taprooted, or ± rhizomatous (bases branched, horizontal or ascending to erect).
Stems

1, glabrous or leaf axils tomentose.

1 or 2–5+, clustered, lanate- or arachno-tomentose or glabrescent.

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).

(often abaxially cyanic) petiolate (petioles hairy to glabrate);

blades ovate to lanceolate or narrowly lanceolate, 20–60+ × 10–30+ mm, bases abruptly contracted to tapering, margins subentire or denticulate to subserrate (abaxial faces usually tomentose, adaxials frequently glabrate).

Cauline leaves

gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow).

gradually or abruptly reduced (proximal petiolate, similar to basals; mids and distals sessile, lanceolate, entire).

Peduncles

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

conspicuously bracteate, usually hairy.

Ray florets

8–10+;

corolla laminae 10–15+ mm.

(5–)8 or 13;

corolla laminae 4–10 mm.

Disc florets

45–60+;

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

40–60+;

corolla tubes 1.5–2.5 mm, limbs 3.5–4.5 mm.

Phyllaries

13 or 21, green, 7–9+ mm, glabrous.

13 or 21, green or yellowish, 4–7+ mm, tomentose to glabrescent.

Calyculi

inconspicuous.

conspicuous.

Heads

15–50+ in corymbiform arrays.

3–20+ in open or compact, corymbiform to subumbelliform arrays (subtended by smaller arrays arising from leaf axils).

Cypselae

2–2.5 mm, glabrous;

pappi 6–7 mm.

1.5–2.5 mm, usually hirtellous on ribs, sometimes glabrous;

pappi 5–6+ mm.

2n

= 46.

= 44, 46, 92.

Packera breweri

Packera neomexicana

Phenology Flowering mid Apr–late May.
Habitat Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas
Elevation 200–1500 m (700–4900 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM; UT; w Mexico
[WildflowerSearch map]
[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.)

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Plants loosely tomentose or glabrate; basal leaves: blades narrowly lanceolate, margins subentire or irregularly dentate
var. mutabilis
1. Plants usually densely lanate or woolly tomentose, seldom glabrate; basal leaves: blades ovate or broadly lanceolate, margins dentate to deeply dentate or dissected
→ 2
2. Plants taprooted; cauline leaves conspicuous
var. neomexicana
2. Plants rhizomatous or fibrous-rooted; cauline leaves inconspicuous (bractlike)
var. toumeyi
Source FNA vol. 20, p. 580. FNA vol. 20, p. 593.
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. 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. 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
Subordinate taxa
P. neomexicana var. mutabilis, P. neomexicana var. neomexicana, P. neomexicana var. toumeyi
Synonyms Senecio breweri Senecio neomexicanus
Name authority (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) (A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
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