Packera streptanthifolia |
Packera schweinitziana |
|
---|---|---|
cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel |
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
|
Habit | Perennials, 10–50+ cm; fibrous-rooted (caudices weak to stout, horizontal to suberect). | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). |
Stems | 1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils. |
1, glabrous or leaf axils sparsely tomentose. |
Basal leaves | (and proximal cauline, relatively thick and turgid) petiolate; blades spatulate to oblanceolate, or ovate to orbiculate, 20–40+ × 10–30+ mm, bases tapering to abruptly contracted or subcordate, margins entire, crenate, dentate, or weakly lobulate (faces usually glabrous, sometimes hairy). |
(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 to abruptly reduced (± petiolate or sessile; entire or subentire). |
gradually reduced (± sessile; lacerate to subcrenate). |
Peduncles | bracteate, glabrous or sparsely tomentose. |
bracteate, glabrous. |
Ray florets | 8 or 13; corolla laminae 5–10 mm. |
8–13; corolla laminae 4–7 mm. |
Disc florets | 35–60+; corolla tubes 2–4 mm, limbs 2.5–4 mm. |
50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
Phyllaries | (8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous. |
13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
Calyculi | conspicuous. |
conspicuous. |
Heads | 2–20+ in loose, corymbiform or subumbelliform arrays. |
8–20+ in loose, corymbiform arrays. |
Cypselae | 1–2.5 mm, glabrous; pappi 3–6 mm. |
1–1.5 mm, glabrous; pappi 5–5.5 mm. |
2n | = 46, 92. |
= 44. |
Packera streptanthifolia |
Packera schweinitziana |
|
Phenology | Flowering late May–late Aug. | Flowering May–Jul. |
Habitat | Forests, open meadows, valleys, dry to damp and loamy soils | Sunny, wet areas, meadows, swamps, ditches, roadsides |
Elevation | 1000–3400 m (3300–11200 ft) | 100–1800 m (300–5900 ft) |
Distribution |
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT; SK; YT
|
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
|
Discussion | Packera streptanthifolia is widespread and variable throughout the Western Cordillera. It includes weakly defined phases that have been treated as distinct species or as varieties. Characteristics used to delimit those taxa often overlap and are difficult to score; some “phases” grade into each other. Northern populations are sometimes segregated as a distinct taxon (e.g., Senecio streptanthifolia var. borealis; J. F. Bain 1988). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 20, p. 599. | FNA vol. 20, p. 598. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio streptanthifolius, P. streptanthifolia var. borealis, Senecio adamsii, Senecio aureus var. borealis, Senecio cognatus, Senecio cymbalarioides, Senecio cymbalarioides var. borealis, Senecio cymbalarioides var. streptanthifolius, Senecio fulgens, Senecio jonesii, Senecio leonardii, Senecio longipetiolatus, Senecio oödes, Senecio platylobus, Senecio rydbergii, Senecio streptanthifolius var. borealis, Senecio streptanthifolius var. kluanei, Senecio streptanthifolius var. laetiflorus, Senecio streptanthifolius var. oödes, Senecio streptanthifolius var. rubricaulis, Senecio streptanthifolius var. wallowensis, Senecio subcuneatus, Senecio suksdorfii, Senecio wardii | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) |
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