Packera breweri |
Packera tridenticulata |
|
---|---|---|
Brewer's ragwort |
threetooth ragwort |
|
Habit | Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). | Perennials, 10–30+ cm; taprooted (caudices ascending to erect). |
Stems | 1, glabrous or leaf axils tomentose. |
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes 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, relatively thick and turgid) petiolate; blades lanceolate or narrowly oblanceolate, 20–40+ × 5–15 mm, bases tapering, margins usually entire, sometimes sub-pinnatisect (apices subentire or dentate). |
Cauline leaves | gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). |
gradually reduced (± petiolate or sessile). |
Peduncles | usually ebracteate (rarely with 1–2 bractlets), glabrous. |
bracteate, glabrous or sparsely tomentose. |
Ray florets | 8–10+; corolla laminae 10–15+ mm. |
8–10(–13); corolla laminae 5–8+ mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–4.5 mm. |
45–60+; corolla tubes 3–3.5 mm, limbs 4–5 mm. |
Phyllaries | 13 or 21, green, 7–9+ mm, glabrous. |
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally. |
Calyculi | inconspicuous. |
inconspicuous. |
Heads | 15–50+ in corymbiform arrays. |
4–15+ in corymbiform arrays. |
Cypselae | 2–2.5 mm, glabrous; pappi 6–7 mm. |
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs; pappi 5–6 mm. |
2n | = 46. |
= 46. |
Packera breweri |
Packera tridenticulata |
|
Phenology | Flowering mid Apr–late May. | Flowering late May–early Jul. |
Habitat | Dry, rocky soils, partially shaded or protected areas, grasslands, oak savannas, roadsides, disturbed areas | Open, dry areas, roadsides, gravelly or sandy slopes, short-grass prairies or sagebrush scrubs |
Elevation | 200–1500 m (700–4900 ft) | 1000–2000 m (3300–6600 ft) |
Distribution |
CA
|
CO; KS; ND; NE; NM; OK; SD; TX; WY
|
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 tridenticulata is found throughout the central High Plains, in the foothills of the Rocky Mountains, and in high valleys to the west of the Rocky Mountain front. It tends to grow in clumps; the multiple stems arise from well-developed taproots. It apparently hybridizes with P. neomexicana var. mutabilis where their ranges overlap. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 580. | FNA vol. 20, p. 601. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio breweri | Senecio tridenticulatus, Senecio acutidens, Senecio compactus, Senecio densus, Senecio oblanceolatus |
Name authority | (Burtt Davy) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) |
Web links |