Packera breweri |
Packera hesperia |
|
---|---|---|
Brewer's ragwort |
serpentine groundsel, Siskiyou butterweed, western ragwort |
|
Habit | Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). |
Stems | 1, glabrous or leaf axils tomentose. |
1, glabrous or sparsely 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 ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. |
Cauline leaves | gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). |
abruptly reduced (sessile, clasping; bractlike, entire). |
Peduncles | usually ebracteate (rarely with 1–2 bractlets), glabrous. |
bracteate (bractlets red-tinged), densely lanate-tomentose. |
Ray florets | 8–10+; corolla laminae 10–15+ mm. |
(8–)13; corolla laminae 6–10+ mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–4.5 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
Phyllaries | 13 or 21, green, 7–9+ mm, glabrous. |
(13–)21, green (tips red or dark red), densely tomentose proximally. |
Calyculi | inconspicuous. |
conspicuous (bractlets narrow, red-tinged). |
Heads | 15–50+ in corymbiform arrays. |
1–4+ in corymbiform arrays. |
Cypselae | 2–2.5 mm, glabrous; pappi 6–7 mm. |
1.5–2 mm, glabrous; pappi 5–6 mm. |
2n | = 46. |
= 46. |
Packera breweri |
Packera hesperia |
|
Phenology | Flowering mid Apr–late May. | Flowering mid Apr–mid Jun. |
Habitat | Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas | Serpentine derived soils, open woodland scrub |
Elevation | 200–1500 m (700–4900 ft) | 500–2500 m (1600–8200 ft) |
Distribution |
CA
|
CA; OR
|
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 hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 580. | FNA vol. 20, p. 589. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio breweri | Senecio hesperius, Senecio auleticus |
Name authority | (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |