Packera hesperia |
Packera cymbalaria |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
dwarf arctic groundsel, dwarf arctic ragwort, northern butterweed |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 6–25+ cm; rhizomatous (mat forming, rhizomes horizontal to suberect, branched). |
Stems | 1, glabrous or sparsely tomentose. |
usually 1 (sometimes more, clustered), usually glabrous, sometimes bases and leaf axils tomentose. |
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. |
petiolate; blades ovate to obovate, lyrate, or reniform, 10–30+ × 10–25+ mm, bases cuneate (sometimes tapering to winged petioles) to subcordate or contracted, margins crenate, dentate, or weakly lobed. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
abruptly reduced (sessile, not clasping; lanceolate, entire or pinnately lobed to pinnatisect). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
0 or relatively reduced (then densely tomentose). |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
0 or 11–13; corolla laminae (yellow, purple streaks in veins) 10–14+ mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
60–75+; corolla tubes 2–2.5 mm, limbs 4–5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
21, deep red or green (tips red), 6–8 mm, glabrous. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
conspicuous (bractlets cyanic). |
Heads | 1–4+ in corymbiform arrays. |
1–2. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1.5–2 mm, glabrous; pappi 5–6 mm. |
2n | = 46. |
= 46, 92, 138. |
Packera hesperia |
Packera cymbalaria |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering mid Jun–early Aug. |
Habitat | Serpentine derived soils, open woodland scrub | Exposed rocky slopes, tundra turf |
Elevation | 500–2500 m (1600–8200 ft) | 0–1900 m (0–6200 ft) |
Distribution |
CA; OR
|
AK; AB; BC; NF; NT; QC; YT
|
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera cymbalaria occurs in three, disjunct regions: western Alaska eastward into western N.W.T. and south into northwestern British Columbia; Newfoundland and the Gaspé Peninsula, Quebec; and Siberia. Considerable morphologic overlap exists between western and eastern populations in North America; western populations have slightly different flavonoid chemistries and chromosome numbers. Western populations are either diploid or tetraploid; eastern populations are hexaploid. The correct name for this species may prove to be Packera heterophylla (Fischer) E. Wiebe, based on Cineraria heterophylla Fischer. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 583. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio cymbalaria, Cineraria lyrata, P. resedifolia, S. fernaldii, S. resedifolius |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Pursh) W. A. Weber & Á. Löve: Bot. Not. 128: 497. (1976) |
Web links |