Packera breweri |
Packera eurycephala |
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Brewer's ragwort |
cut-leaf butterweed, wide-head groundsel |
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Habit | Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). | Perennials, 20–50+ cm, taprooted (caudices branched, ascending to erect, woody). | ||||
Stems | 1, glabrous or leaf axils tomentose. |
1 or, usually, multiple, clustered, densely tomentose to glabrescent. |
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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). |
(soon withering), petiolate; blades lyrate (lateral lobes 2–6+ pairs), ovate, obovate, or spatulate, 70–100+ × 20–30+ mm, bases tapering, ultimate margins irregularly and coarsely serrate-dentate. |
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Cauline leaves | gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). |
gradually reduced (± petiolate, proximal and mid similar to basal, terminal lobes smaller than laterals; distal sessile, incised). |
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Peduncles | usually ebracteate (rarely with 1–2 bractlets), glabrous. |
bracteate, sparsely to densely lanate-tomentose. |
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Ray florets | 8–10+; corolla laminae 10–15+ mm. |
8 or 13; corolla laminae 10–15 mm. |
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Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–4.5 mm. |
35–50+; corolla tubes 3.5–4.5 mm, limbs 2.5–3.5 mm. |
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Phyllaries | 13 or 21, green, 7–9+ mm, glabrous. |
13 or 21, green (tips sometimes yellow), 8–10+ mm, densely tomentose proximally, glabrescent distally. |
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Calyculi | inconspicuous. |
inconspicuous (bractlets tomentose). |
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Heads | 15–50+ in corymbiform arrays. |
5–20+ in open or compact (rarely), cymiform arrays. |
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Cypselae | 2–2.5 mm, glabrous; pappi 6–7 mm. |
1–1.5 mm, glabrous; pappi 6–7 mm. |
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2n | = 46. |
= 46. |
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Packera breweri |
Packera eurycephala |
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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 |
CA
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CA; OR
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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 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 580. | FNA vol. 20, p. 586. | ||||
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Senecio breweri | Senecio eurycephalus | ||||
Name authority | (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | ||||
Web links |