Packera pauciflora |
Packera cana |
|
---|---|---|
alpine groundsel, rayless alpine butterweed, rayless alpine groundsel |
woolly butterweed, woolly groundsel |
|
Habit | Perennials, 20–40+ cm; fibrous-rooted (caudices weakly spreading, horizontal to erect). | Perennials, 10–30+ cm; rhizomatous (rhizomes branched, suberect, stout). |
Stems | 1 or 2–3, clustered, glabrous or glabrate. |
1 (per rosette, rosettes clustered), densely lanate or canescent. |
Basal leaves | (relatively thick and turgid) petiolate; blades elliptic-ovate, ovate, or subreniform, 20–40+ × 10–30+ mm, bases tapering to subcordate, margins dentate to crenate (proximal cauline leaves petiolate; margins dissected to pinnatifid). |
(and proximal cauline) petiolate; blades ovate or elliptic to lanceolate, 25–50+ × 10–30 mm, bases tapering, margins entire or irregularly undulate to weakly dentate (abaxial faces persistently lanate, adaxial lanate to subglabrescent). |
Cauline leaves | gradually reduced (sessile, subentire). |
gradually reduced (petiolate or sessile, then weakly clasping; elliptic to lanceolate, entire or weakly dentate). |
Peduncles | bracteate (bractlets cyanic or reddish), glabrous or sparsely tomentose distally. |
bracteate, usually densely lanate to floccose-tomentose (sometimes subglabrescent). |
Ray florets | 0 or 8–13; corolla laminae (deep orange-yellow) 5–7 mm. |
8–10 (or 13); corolla laminae 8–10+ mm. |
Disc florets | 60–80+; corolla tubes 1.5–2.5 mm, limbs 2.5–3.5 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm. |
Phyllaries | 13 or 21, deep red or green (then tips deep red to purple), 7–10 mm, glabrous. |
13 or 21, green, 5–8+ mm, densely tomentose. |
Calyculi | conspicuous (bractlets deep red or at least apices deep red to purple). |
inconspicuous (bractlets tomentose). |
Heads | 1–6+ in open to compact, subumbelliform arrays. |
8–15+ in corymbiform arrays. |
Cypselae | 1–1.5 mm, glabrous; pappi 3–4.5 mm. |
2.5–3.5+ mm, glabrous; pappi 4.5–7 mm. |
2n | = 46, 130+. |
= 46, 92. |
Packera pauciflora |
Packera cana |
|
Phenology | Flowering early Jul–late Aug. | Flowering late Jun (south)–mid Aug (north). |
Habitat | Damp meadows or woods, subalpine to alpine in west, lower in east | Open plains and sagebrush associations, dry rocky slopes and crevices in granitic and limestone outcrops |
Elevation | 0–2700 m (0–8900 ft) | 200–3700 m (700–12100 ft) |
Distribution |
AK; CA; WA; WY; AB; BC; NL; NT; ON; QC; YT
|
AZ; CA; CO; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
|
Discussion | Heads of Packera pauciflora are usually discoid. Its range and habitat overlap those of P. indecora; the two can be difficult to distinguish. Disjunction from principal distribution to Sierra Nevada of California is 1200 km. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera cana is found in a wide variety of habitats and in a wide range of elevations throughout the western Cordillera and into the High Plains. Morphology is relatively uniform throughout its range except that alpine specimens are notably dwarfed and are often mistaken for P. werneriifolia, which differs by its consistently scapiform habit. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 595. | FNA vol. 20, p. 580. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio pauciflorus, Senecio aureus var. discoideus, Senecio discoideus, Senecio lembertii | Senecio canus, Senecio canus var. eradiatus, Senecio canus var. purshianus, Senecio convallium, Senecio hallii, Senecio hallii var. discoidea, Senecio harbourii, Senecio howellii, Senecio laramiensis, Senecio oreopolus, Senecio purshianus |
Name authority | (Pursh) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976) | (Hooker) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) |
Web links |
|
|