Packera schweinitziana

(Nuttall) W. A. Weber & Á. Löve

Phytologia 49: 48. 1981.

Common names: Schweinitz’s ragwort
Basionym: Senecio schweinitzianus Nuttall Trans. Amer. Philos. Soc., n. s. 7: 413. 1841
Synonyms: Senecio aureus var. lanceolatus Oakes ex Torey & A. Gray Senecio robbinsii Oakes ex Rusby
Treatment appears in FNA Volume 20. Treatment on page 598. Mentioned on page 572, 579.

Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). Stems 1, glabrous or leaf axils 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). Cauline leaves gradually reduced (± sessile; lacerate to subcrenate). Heads 8–20+ in loose, corymbiform arrays. Peduncles bracteate, glabrous. Calyculi conspicuous. Phyllaries 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. Ray florets 8–13; corolla laminae 4–7 mm. Disc florets 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. Cypselae 1–1.5 mm, glabrous; pappi 5–5.5 mm. 2n = 44.

Phenology: Flowering May–Jul.
Habitat: Sunny, wet areas, meadows, swamps, ditches, roadsides
Elevation: 100–1800 m



N.B., N.S., P.E.I., Que., Maine, N.H., N.Y., N.C., Tenn., Vt.


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.

Selected References


Lower Taxa

... more about "Packera schweinitziana"
Debra K. Trock +
(Nuttall) W. A. Weber & Á. Löve +
Senecio schweinitzianus +
Schweinitz’s ragwort +
N.B. +, N.S. +, P.E.I. +, Que. +, Maine +, N.H. +, N.Y. +, N.C. +, Tenn. +  and Vt. +
100–1800 m +
Sunny, wet areas, meadows, swamps, ditches, roadsides +
Flowering May–Jul. +
Senecio aureus var. lanceolatus +  and Senecio robbinsii +
Packera schweinitziana +
species +