Packera breweri

(Burtt Davy) W. A. Weber & Á. Löve

Phytologia 49: 46. 1981

Common names: Brewer’s ragwort
Basionyms: Senecio breweri Burtt Davy Erythea 3: 116. 1895
Treatment appears in FNA Volume 20. Treatment on page 580. Mentioned on page 575.

Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). Stems 1, glabrous or leaf axils 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). Cauline leaves gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). Heads 15–50+ in corymbiform arrays. Peduncles usually ebracteate (rarely with 1–2 bractlets), glabrous. Calyculi inconspicuous. Phyllaries 13 or 21, green, 7–9+ mm, glabrous. Ray florets 8–10+; corolla laminae 10–15+ mm. Disc florets 45–60+; corolla tubes 3–3.5 mm, limbs 4–4.5 mm. Cypselae 2–2.5 mm, glabrous; pappi 6–7 mm. 2n = 46.


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

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.

Selected References

None.

Lower Taxa

None.

... more about "Packera breweri"
Debra K. Trock +
(Burtt Davy) W. A. Weber & Á. Löve +
Senecio breweri +
Brewer’s ragwort +
200–1500 m +
Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas +
Flowering mid Apr–late May. +
Compositae +
Packera breweri +
species +