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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
from FNA
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
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
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
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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