Packera schweinitziana |
Packera dimorphophylla |
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New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
splitleaf groundsel |
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Habit | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). | Perennials, 10–30+ cm; fibrous-rooted (caudices horizontal to erect, relatively short and stout). | ||||||||
Stems | 1, glabrous or leaf axils sparsely tomentose. |
usually 1, rarely 2–3, clustered, glabrous. |
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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). |
(relatively thick and turgid) petiolate (petioles broad-winged or narrow, delicate); blades ovate, ovate-orbiculate, oblong-lanceolate, orbiculate, suborbiculate, reniform, or subreniform, 10–50+ × 10–40 mm, bases tapering or subcordate to abruptly contracted, margins entire or crenate. |
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Cauline leaves | gradually reduced (± sessile; lacerate to subcrenate). |
gradually reduced (proximal and mid sometimes as large as or larger than basal, sessile, oblanceolate to obovate, sometimes lyrate, sometimes auriculate and/or clasping, subentire to irregularly dissected; distal usually sessile, bractlike, sometimes larger). |
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Peduncles | bracteate, glabrous. |
inconspicuously bracteate or ebracteate, glabrous. |
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Ray florets | 8–13; corolla laminae 4–7 mm. |
8 or 13; corolla laminae (deep yellow to orange) 5–8+ mm. |
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Disc florets | 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
45–60+; corolla tubes 2–3 mm, limbs 2.5–3.5 mm. |
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Phyllaries | 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
(8–)13 or 21, green (tips cyanic), 5–7+ mm, glabrous. |
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Calyculi | conspicuous. |
conspicuous (bases of bractlets swollen). |
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Heads | 8–20+ in loose, corymbiform arrays. |
1–6+ in congested, corymbiform or subumbelliform arrays. |
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Cypselae | 1–1.5 mm, glabrous; pappi 5–5.5 mm. |
0.75–1.5 mm, glabrous, pappi 3–4 mm. |
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2n | = 44. |
= 46. |
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Packera schweinitziana |
Packera dimorphophylla |
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Phenology | Flowering May–Jul. | |||||||||
Habitat | Sunny, wet areas, meadows, swamps, ditches, roadsides | |||||||||
Elevation | 100–1800 m (300–5900 ft) | |||||||||
Distribution |
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
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CO; ID; MT; NM; NV; UT; WY
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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.) |
Varieties 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 584. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii | Senecio dimorphophyllus | ||||||||
Name authority | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | ||||||||
Web links |