Packera breweri |
Packera glabella |
|
---|---|---|
Brewer's ragwort |
butterweed |
|
Habit | Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). | Annuals or biennials, 20–70+ cm; fibrous-rooted (caudices relatively short, weak). |
Stems | 1, glabrous or leaf axils tomentose. |
1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils 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) obscurely petiolate; blades obovate to oblanceolate, sometimes lyrate (lateral lobes to 5 pairs, terminal lobes larger than laterals), 50–150+ × 10–30+ mm, bases tapering, ultimate margins crenate to irregularly undulate. |
Cauline leaves | gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). |
gradually reduced (weakly clasping, similar to basal). |
Peduncles | usually ebracteate (rarely with 1–2 bractlets), glabrous. |
bracteate, glabrous or bases tomentose. |
Ray florets | 8–10+; corolla laminae 10–15+ mm. |
(8–)13; corolla laminae 7–9 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 2–3 mm. |
Phyllaries | 13 or 21, green, 7–9+ mm, glabrous. |
(13–)21, green, 5–7 mm, glabrous. |
Calyculi | inconspicuous. |
conspicuous (bractlets 2.5–4 mm). |
Heads | 15–50+ in corymbiform arrays. |
8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). |
Cypselae | 2–2.5 mm, glabrous; pappi 6–7 mm. |
1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. |
2n | = 46. |
= 46. |
Packera breweri |
Packera glabella |
|
Phenology | Flowering mid Apr–late May. | Flowering (Feb–)mid Mar–late May. |
Habitat | Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas | Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields |
Elevation | 200–1500 m (700–4900 ft) | 0–600 m (0–2000 ft) |
Distribution |
CA
|
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; NE; OH; OK; SC; TN; TX
|
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 glabella is common and almost weedy in wet, partially shaded places. The hollow, striated stems of P. glabella are distinctive. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 580. | FNA vol. 20, p. 588. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio breweri | Senecio glabellus, Senecio carolinianus, Senecio densiflorus, Senecio lobatus, Senecio lyratus, Senecio mississipianus |
Name authority | (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | (Poiret) C. Jeffrey: Kew Bull. 47: 101. (1992) |
Web links |