Packera schweinitziana |
Packera macounii |
|
---|---|---|
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
long-ray groundsel, Macoun's butterweed, Macoun's groundsel, Puget butterweed, Siskiyou Mountain ragwort, Siskiyou Mountains ragwort |
|
Habit | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). | Perennials, 30–40+ cm; taprooted (caudices ± branched, becoming rhizomiform). |
Stems | 1, glabrous or leaf axils sparsely tomentose. |
1, sparsely to densely tomentose 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). |
(and proximal) petiolate; blades lanceolate to oblanceolate, 30–50+ × 10–20 mm, bases tapering, margins entire or shallowly toothed (slightly revolute). |
Cauline leaves | gradually reduced (± sessile; lacerate to subcrenate). |
gradually reduced (distal sessile, bractlike). |
Peduncles | bracteate, glabrous. |
inconspicuously bracteate or ebracteate, sparsely tomentose to glabrate. |
Ray florets | 8–13; corolla laminae 4–7 mm. |
8(–13); corolla laminae 8–10+ mm. |
Disc florets | 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
30–40+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. |
Phyllaries | 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
13 or 21, green, 5–7+ mm, glabrous. |
Calyculi | conspicuous. |
0 or inconspicuous. |
Heads | 8–20+ in loose, corymbiform arrays. |
6–15+ in corymbiform arrays. |
Cypselae | 1–1.5 mm, glabrous; pappi 5–5.5 mm. |
1.5–2 mm, glabrous; pappi 4–5 mm. |
2n | = 44. |
= 46, 92. |
Packera schweinitziana |
Packera macounii |
|
Phenology | Flowering May–Jul. | Flowering early May–early Jul. |
Habitat | Sunny, wet areas, meadows, swamps, ditches, roadsides | Along streams, roadsides, clearings, disturbed sites, rocky soils, coniferous woodlands |
Elevation | 100–1800 m (300–5900 ft) | 400–1400 m (1300–4600 ft) |
Distribution |
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
|
CA; OR; WA; BC
|
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 macounii is similar in overall morphology to P. cana. Leaves of P. macounii are narrower and frequently revolute. It is often cited as being collected on serpentine soils; it is not restricted to them. Senecio fastigiatus Nuttall (1840) is a later homonym of S. fastigiatus Schweinitz ex Elliott (1823), a name of uncertain application. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 591. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii | Senecio macounii, Senecio fastigiatus, Senecio fastigiatus subsp. macounii, Senecio leucocrinus, Senecio ligulifolius, Senecio spatuliformis |
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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