Packera breweri |
Packera streptanthifolia |
|
---|---|---|
Brewer's ragwort |
cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel |
|
Habit | Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). | Perennials, 10–50+ cm; fibrous-rooted (caudices weak to stout, horizontal to suberect). |
Stems | 1, glabrous or leaf axils tomentose. |
1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils. |
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, relatively thick and turgid) petiolate; blades spatulate to oblanceolate, or ovate to orbiculate, 20–40+ × 10–30+ mm, bases tapering to abruptly contracted or subcordate, margins entire, crenate, dentate, or weakly lobulate (faces usually glabrous, sometimes hairy). |
Cauline leaves | gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). |
gradually to abruptly reduced (± petiolate or sessile; entire or subentire). |
Peduncles | usually ebracteate (rarely with 1–2 bractlets), glabrous. |
bracteate, glabrous or sparsely tomentose. |
Ray florets | 8–10+; corolla laminae 10–15+ mm. |
8 or 13; corolla laminae 5–10 mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–4.5 mm. |
35–60+; corolla tubes 2–4 mm, limbs 2.5–4 mm. |
Phyllaries | 13 or 21, green, 7–9+ mm, glabrous. |
(8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous. |
Calyculi | inconspicuous. |
conspicuous. |
Heads | 15–50+ in corymbiform arrays. |
2–20+ in loose, corymbiform or subumbelliform arrays. |
Cypselae | 2–2.5 mm, glabrous; pappi 6–7 mm. |
1–2.5 mm, glabrous; pappi 3–6 mm. |
2n | = 46. |
= 46, 92. |
Packera breweri |
Packera streptanthifolia |
|
Phenology | Flowering mid Apr–late May. | Flowering late May–late Aug. |
Habitat | Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas | Forests, open meadows, valleys, dry to damp and loamy soils |
Elevation | 200–1500 m (700–4900 ft) | 1000–3400 m (3300–11200 ft) |
Distribution |
CA
|
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT; SK; YT
|
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 streptanthifolia is widespread and variable throughout the Western Cordillera. It includes weakly defined phases that have been treated as distinct species or as varieties. Characteristics used to delimit those taxa often overlap and are difficult to score; some “phases” grade into each other. Northern populations are sometimes segregated as a distinct taxon (e.g., Senecio streptanthifolia var. borealis; J. F. Bain 1988). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 580. | FNA vol. 20, p. 599. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio breweri | Senecio streptanthifolius, P. streptanthifolia var. borealis, Senecio adamsii, Senecio aureus var. borealis, Senecio cognatus, Senecio cymbalarioides, Senecio cymbalarioides var. borealis, Senecio cymbalarioides var. streptanthifolius, Senecio fulgens, Senecio jonesii, Senecio leonardii, Senecio longipetiolatus, Senecio oödes, Senecio platylobus, Senecio rydbergii, Senecio streptanthifolius var. borealis, Senecio streptanthifolius var. kluanei, Senecio streptanthifolius var. laetiflorus, Senecio streptanthifolius var. oödes, Senecio streptanthifolius var. rubricaulis, Senecio streptanthifolius var. wallowensis, Senecio subcuneatus, Senecio suksdorfii, Senecio wardii |
Name authority | (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) |
Web links |