Packera hesperia |
Packera franciscana |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
San Francisco Peaks ragwort |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 3–7+ cm; rhizomatous (rhizomes creeping, ascending). |
Stems | 1, glabrous or sparsely tomentose. |
1 (often purplish), sparsely lanate or arachno-tomentose, glabrescent. |
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 lyrate to sublyrate (midribs winged) or ovate to orbiculate, 10–20+ × 30–50+ mm, bases tapering to contracted, ultimate margins ± dentate (faces glabrate at flowering). |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually reduced (sessile; usually bractlike and entire, sometimes larger and pinnatifid). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
conspicuously bracteate (bractlets red-tipped), densely lanate-tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
8 or 13; corolla laminae 5–10 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
30–40+; corolla tubes 2–3 mm, limbs 2.5–3.5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
13 or 21, purplish, 6–9 mm, sparsely tomentose. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
conspicuous (bractlets reddish or purple). |
Heads | 1–4+ in corymbiform arrays. |
borne singly or 2–6 in compact, cymiform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1.5–2 mm, glabrous; pappi 5–6 mm. |
2n | = 46. |
= 46. |
Packera hesperia |
Packera franciscana |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering mid Aug–mid Oct. |
Habitat | Serpentine derived soils, open woodland scrub | Talus slopes, rock crevices, above timberline |
Elevation | 500–2500 m (1600–8200 ft) | 3200–3800 m (10500–12500 ft) |
Distribution |
CA; OR
|
AZ |
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 franciscana is known only from above timberline in the San Francisco Peaks and is in the Center for Plant Conservation’s National Collection of Endangered Plants. It spreads by extensive rhizomes and is fairly abundant locally. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 587. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio franciscanus |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |