Packera hesperia |
Packera millefolium |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
Piedmont ragwort |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 25–60+ cm; fibrous-rooted (caudices branched). |
Stems | 1, glabrous or sparsely tomentose. |
1 or 2–3, clustered, glabrous or leaf axils sparsely hairy. |
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 narrowly ovate to ovate (2–3 times pinnately dissected, ultimate lobes mostly linear to filiform), 50–80 × 30–50 mm, bases ± truncate or auriculate, ultimate margins entire or remotely dentate. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually reduced (petiolate or sessile, similar to basals). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
bracteate or ebracteate, glabrous. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
8–10(–13); corolla laminae 8–12 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
35–50+; corolla tubes 2–3 mm, limbs 1.5–2.5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
(13–)21, green, 4–6 mm, glabrous (tips sometimes hair-tufted). |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
0. |
Heads | 1–4+ in corymbiform arrays. |
10–30+ in open, corymbiform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
0.75–1.5 mm, hairy on ribs; pappi 3–4 mm. |
2n | = 46. |
|
Packera hesperia |
Packera millefolium |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering early May–mid Jun. |
Habitat | Serpentine derived soils, open woodland scrub | Open areas along streams, rock outcrops in thin, granitic-derived soils |
Elevation | 500–2500 m (1600–8200 ft) | 400–900 m (1300–3000 ft) |
Distribution |
CA; OR
|
GA; NC; SC; VA |
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 millefolia is known only from granitic soils in the southern Appalachians. It is similar in overall aspect to the widespread P. anonyma; it differs by its 2–3 times pinnately dissected leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 591. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio millefolium, Senecio memmingeri |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |