Packera hesperia |
Packera aurea |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
golden groundsel, golden ragwort |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 30–60+ cm; rhizomatous and/or fibrous-rooted (rhizomes or caudices erect to horizontal). |
Stems | 1, glabrous or sparsely tomentose. |
1 or 2–3+, clustered, glabrous or 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 cordate to reniform, 20–60 × 20–60 mm, bases abruptly contracted or ± cordate, margins crenate to crenate-serrate (apices rounded, faces glabrous). |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually reduced (petiolate or sessile, not clasping; blades oblong to lyrate, lateral lobes 2–4 pairs). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
bracteate, glabrous or sparsely tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
(8–)10–13; corolla laminae 8–10+ mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
55–70+; corolla tubes 3–3.5 mm, limbs 2–2.5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
13–21, green (tips purple or black), 6–8 mm, glabrous or sparsely tomentose proximally. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
inconspicuous. |
Heads | 1–4+ in corymbiform arrays. |
6–20+ in corymbiform to subumbelliform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1–1.5 mm, glabrous; pappi 4.5–5.5 mm. |
2n | = 46. |
= 44. |
Packera hesperia |
Packera aurea |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering late Feb–early May (south), late May–early Aug (north). |
Habitat | Serpentine derived soils, open woodland scrub | Damp and swampy places in woodlands, meadows, along gravel banks and streambeds, acidic or sandy/gravelly soils |
Elevation | 500–2500 m (1600–8200 ft) | 0–1500 m (0–4900 ft) |
Distribution |
CA; OR
|
AL; AR; CT; DC; FL; GA; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; MS; NC; ND; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; VA; VT; WI; WV; MB; NB; NL; NS; ON; PE; QC; SPM
|
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera aurea is abundant and widespread throughout eastern United States and Canada. It reproduces asexually from branched rhizomes or from adventitious shoots. Putative hybrids between P. aurea and P. paupercula, P. pseudaurea, P. schweinitziana, and P. tomentosa have been reported. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 579. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio aureus, Senecio aureus var. aquilonius, Senecio aureus var. ashei, Senecio aureus var. aurantiacus, Senecio aureus var. gracilis, Senecio aureus var. intercursus, Senecio gracilis |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Linnaeus) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976) |
Web links |