Packera hesperia |
Packera contermina |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
dwarf arctic butterweed, high alpine butterweed, northwestern groundsel |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 4–10+ cm; rhizomatous and/or fibrous-rooted (mat-forming, bases ascending to erect, coarse). |
Stems | 1, glabrous or sparsely tomentose. |
1 or 2–3, clustered, bases floccose-tomentose, leaf axils tomentose, glabrous elsewhere. |
Basal leaves | (and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. |
(thick, fleshy) petiolate; blades usually ovate, oblong, or spatulate, sometimes sublyrate, 20–50+ × 20–40+ mm, bases tapering (to winged petioles) or abruptly contracted to subcordate (petioles narrow), margins crenate, coarsely serrate, or subentire. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
(often cyanic) gradually reduced (sessile, not clasping; lanceolate to linear, usually irregularly and shallowly lobed, rarely entire). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
conspicuously bracteate, glabrous. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
10–12; corolla laminae 8–14+ mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
55–75+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
21, deep red or green (tips reddish), 8–12+ mm, white-tomentose proximally. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
conspicuous (tips of bractlets often purple). |
Heads | 1–4+ in corymbiform arrays. |
1–2(–5+). |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1–1.25 mm, glabrous; pappi 4–7 mm. |
2n | = 46. |
= 160+. |
Packera hesperia |
Packera contermina |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering early Jul–late Aug. |
Habitat | Serpentine derived soils, open woodland scrub | Subalpine or alpine, open areas, rocky slopes or ravines, moist tundra or snowbeds |
Elevation | 500–2500 m (1600–8200 ft) | 2100–3000 m (6900–9800 ft) |
Distribution |
CA; OR
|
MT; WA; AB; BC
|
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera contermina grows in rocky areas and produces relatively short rhizomes and abundant thin fibrous roots. In mesic sites, the rhizomes are more robust and the fibrous roots are fewer. This taxon has been treated as part of P. cymbalaria or P. subnuda. Morphologic and cytologic data lend support to its recognition at species rank. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 582. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio conterminus |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Greenman) J. F. Bain: Novon 9: 457. (1999) |
Web links |