Packera hesperia |
Packera musiniensis |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
|
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 5–10 cm; ± rhizomatous (bases loosely branched, elongated, horizontal to ascending). |
Stems | 1, glabrous or sparsely tomentose. |
1 (sometimes branched from bases), densely white- or gray-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 oblanceolate, 20–30+ × 5–13+ mm, bases tapering, margins pinnatifid to crenate. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually reduced (sessile; proximal and mid nearly equaling basals, distals bractlike). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
ebracteate, tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
0 or 1; corolla laminae ca. 6 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
not seen. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
8–13, yellow-green to purple (or with purplish midstripes), 8–9.5 mm, sparsely tomentose (apices rounded). |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
0 or inconspicuous. |
Heads | 1–4+ in corymbiform arrays. |
3–15+ in corymbiform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
not seen (reported to be glabrous). |
2n | = 46. |
= 46. |
Packera hesperia |
Packera musiniensis |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering mid Jul–mid Aug. |
Habitat | Serpentine derived soils, open woodland scrub | Subalpine and alpine ridges, talus or scree slopes, barren areas on Flagstaff limestone |
Elevation | 500–2500 m (1600–8200 ft) | 2900–3300 m (9500–10800 ft) |
Distribution |
CA; OR
|
UT |
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Packera musiniensis is a high-elevation dwarf species; its affinities within Packera are still uncertain. Welsh believed it to be allied to P. cana or P. multilobata, or both. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 592. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio musiniensis |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (S. L. Welsh) Trock: Sida 21: 1643. (2005) |
Web links |