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Brewer's ragwort

shale barren ragwort

Habit Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). Perennials, 20–40+ cm; rhizomatous (rhizomes branched, horizontal to suberect).
Stems

1, glabrous or leaf axils tomentose.

1 (sometimes from rosettes, rosettes sometimes clustered), 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).

petiolate;

blades broadly lanceolate to elliptic or spatulate, 20–40+ × 10–20+ mm, bases tapering, margins entire or subentire to dentate distally (faces tomentose).

Cauline leaves

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

abruptly reduced (petiolate or sessile; narrowly lanceolate to sublyrate, sharply toothed to pinnatisect or entire).

Peduncles

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

bracteate, densely lanate to sparsely tomentose.

Ray florets

8–10+;

corolla laminae 10–15+ mm.

8–10(–13);

corolla laminae 5–10 mm.

Disc florets

45–60+;

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

25–35+;

corolla tubes 3–4 mm, limbs 1.5–2 mm.

Phyllaries

13 or 21, green, 7–9+ mm, glabrous.

13 or 21, green, 5–7 mm, densely tomentose (apices scarious).

Calyculi

inconspicuous.

inconspicuous.

Heads

15–50+ in corymbiform arrays.

6–12+ in corymbiform arrays (lateral cymiform arrays sometimes originating in leaf axils).

Cypselae

2–2.5 mm, glabrous;

pappi 6–7 mm.

1–1.5 mm, hirtellous on ribs;

pappi 4–5 mm.

2n

= 46.

= 46.

Packera breweri

Packera antennariifolia

Phenology Flowering mid Apr–late May. Flowering late Apr–late May.
Habitat Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas Slopes on shale barrens
Elevation 200–1500 m (700–4900 ft) 300–800 m (1000–2600 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
MD; PA; VA; WV
[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.)

Packera antennariifolia is known only from shale barrens or shale-derived soils in central Appalachia. Plants growing on steep slopes have stouter, more horizontal caudices and more extensive fibrous roots than specimens from other locations. Specimens from shale-derived soils, not growing directly on shale barrens, have weakly lobulate leaves and noticeably less hairiness.

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

Source FNA vol. 20, p. 580. FNA vol. 20, p. 578.
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. 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. 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 antennariifolius
Name authority (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) (Britton) W. A. Weber & Á. Löve: Phytologia 49: 45. (1981)
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