Packera schweinitziana |
Packera cynthioides |
|
---|---|---|
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
White Mountain ragwort |
|
Habit | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). | Perennials, 20–40+ cm; rhizomatous (rhizomes horizontal to erect). |
Stems | 1, glabrous or leaf axils sparsely tomentose. |
1 or 2–3, clustered, densely lanate-tomentose or canescent, tufts of arachnoid tomentum in leaf axils, or glabrescent. |
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). |
(thick, leathery) petiolate; blades narrowly lanceolate or oblanceolate, 25–100+ × 5–20 mm, bases tapering, margins entire, subentire, dentate, or wavy (adaxial faces early glabrescent). |
Cauline leaves | gradually reduced (± sessile; lacerate to subcrenate). |
gradually reduced (sessile; lanceolate to oblanceolate, entire or wavy). |
Peduncles | bracteate, glabrous. |
0 (or relatively reduced, then densely tomentose). |
Ray florets | 8–13; corolla laminae 4–7 mm. |
(5–)8; corolla laminae 8–10+ mm. |
Disc florets | 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
35–45+; corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm. |
Phyllaries | 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
(8–)13, green (tips red), 3–6 mm, densely tomentose proximally, glabrate distally. |
Calyculi | conspicuous. |
inconspicuous (bractlets red-tipped). |
Heads | 8–20+ in loose, corymbiform arrays. |
10–30+ in open or congested, cymiform arrays. |
Cypselae | 1–1.5 mm, glabrous; pappi 5–5.5 mm. |
1–1.5 mm, glabrous; pappi 5–6 mm. |
2n | = 44. |
= 46. |
Packera schweinitziana |
Packera cynthioides |
|
Phenology | Flowering May–Jul. | Flowering late Jul–mid Sep. |
Habitat | Sunny, wet areas, meadows, swamps, ditches, roadsides | Loose rocky soils, steep slopes, subalpine and pine-juniper forests |
Elevation | 100–1800 m (300–5900 ft) | 2200–2900 m (7200–9500 ft) |
Distribution |
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
|
NM
|
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.) |
Packera cynthioides blooms later than other Packera species at the same latitudes. It is noted by collectors as usually growing on north- or west-facing slopes in limestone-derived soils. Its cauline leaves are well developed and held at a shallow angle to the stem, giving the plant a more “leafy” aspect than other members of the genus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 583. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii | Senecio cynthioides, Senecio fendleri var. subintegra, Senecio wrightii |
Name authority | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) |
Web links |