Packera schweinitziana |
Packera hesperia |
|
---|---|---|
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
serpentine groundsel, Siskiyou butterweed, western ragwort |
|
Habit | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). |
Stems | 1, glabrous or leaf axils sparsely tomentose. |
1, glabrous or sparsely tomentose. |
Basal leaves | (and proximal cauline) petiolate; blades narrowly ovate to oblong-lanceolate, 30–70+ × 10–20+ mm, bases abruptly contracted to subcordate, margins usually serrate-dentate, sometimes subcrenate (apices acute). |
(and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. |
Cauline leaves | gradually reduced (± sessile; lacerate to subcrenate). |
abruptly reduced (sessile, clasping; bractlike, entire). |
Peduncles | bracteate, glabrous. |
bracteate (bractlets red-tinged), densely lanate-tomentose. |
Ray florets | 8–13; corolla laminae 4–7 mm. |
(8–)13; corolla laminae 6–10+ mm. |
Disc florets | 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
Phyllaries | 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
(13–)21, green (tips red or dark red), densely tomentose proximally. |
Calyculi | conspicuous. |
conspicuous (bractlets narrow, red-tinged). |
Heads | 8–20+ in loose, corymbiform arrays. |
1–4+ in corymbiform arrays. |
Cypselae | 1–1.5 mm, glabrous; pappi 5–5.5 mm. |
1.5–2 mm, glabrous; pappi 5–6 mm. |
2n | = 44. |
= 46. |
Packera schweinitziana |
Packera hesperia |
|
Phenology | Flowering May–Jul. | Flowering mid Apr–mid Jun. |
Habitat | Sunny, wet areas, meadows, swamps, ditches, roadsides | Serpentine derived soils, open woodland scrub |
Elevation | 100–1800 m (300–5900 ft) | 500–2500 m (1600–8200 ft) |
Distribution |
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
|
CA; OR
|
Discussion | Packera schweinitziana is rarely mistaken for any other taxon. It grows on slightly acidic soils and may reproduce vegetatively by branched rhizomes. The group of populations on Roan Mountain on the Tennessee-North Carolina border is disjunct from the main distribution. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 589. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii | Senecio hesperius, Senecio auleticus |
Name authority | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
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