Packera hesperia |
Packera hyperborealis |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
northern groundsel |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 6–20+ cm; fibrous-rooted or rhizomatous (rhizomes horizontal to suberect, stout). |
Stems | 1, glabrous or sparsely tomentose. |
usually 1, sometimes multiple, bases and leaf axils tomentose, otherwise glabrous. |
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. |
(and proximal cauline) petiolate; blades oblanceolate to obovate or lyrate (pinnately lobed to pinnatifid, terminal lobes larger than laterals), 10–30+ × 10–20+ mm, bases tapering, ultimate margins ± crenate to serrate. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually to abruptly reduced (sessile; pinnatisect or entire). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
bracteate (bractlets purple-tinged), glabrous or glabrate. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
0 (rarely) or 10–12; corolla laminae 8–10 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
45–60+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
13, green (sometimes purple-tinged distally), 6–8 mm, glabrous. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
0 or inconspicuous (bractlets purple-tinged). |
Heads | 1–4+ in corymbiform arrays. |
1–2(–5+) in cymiform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1.5–2.5 mm, hirtellous on ribs; pappi 6–7 mm. |
2n | = 46. |
= 46. |
Packera hesperia |
Packera hyperborealis |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering mid Jun–early Aug. |
Habitat | Serpentine derived soils, open woodland scrub | Open, dry, rocky or sandy areas, sometimes in fertile soils overlaying limestone |
Elevation | 500–2500 m (1600–8200 ft) | 0–900 m (0–3000 ft) |
Distribution |
CA; OR
|
AK; NT; NU; 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 hyperborealis is known only from lowland tundra from Alaska to the Mackenzie River and as far south as the northern end of the Franklin Mountains. It has also been collected as far north as Banks Island. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 589. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio hyperborealis |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Greenman) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976) |
Web links |