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New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort

splitleaf groundsel

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.

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.

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).

Peduncles

bracteate, glabrous.

inconspicuously bracteate or ebracteate, glabrous.

Ray florets

8–13;

corolla laminae 4–7 mm.

8 or 13;

corolla laminae (deep yellow to orange) 5–8+ mm.

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.

Phyllaries

13 or 21, light green (tips sometimes black), 5–8 mm, glabrous.

(8–)13 or 21, green (tips cyanic), 5–7+ mm, glabrous.

Calyculi

conspicuous.

conspicuous (bases of bractlets swollen).

Heads

8–20+ in loose, corymbiform arrays.

1–6+ in congested, corymbiform or subumbelliform arrays.

Cypselae

1–1.5 mm, glabrous;

pappi 5–5.5 mm.

0.75–1.5 mm, glabrous, pappi 3–4 mm.

2n

= 44.

= 46.

Packera schweinitziana

Packera dimorphophylla

Phenology Flowering May–Jul.
Habitat Sunny, wet areas, meadows, swamps, ditches, roadsides
Elevation 100–1800 m (300–5900 ft)
Distribution
from FNA
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; ID; MT; NM; NV; UT; WY
[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.)

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Basal leaves: petioles broad-winged, blades ovate to oblong-lanceolate, bases tapering; stems usually not branched
var. dimorphophylla
1. Basal leaves: petioles narrowly, if at all winged, blades suborbiculate, orbiculate, ovate-orbiculate, subreniform, or reniform, bases subcordate to abruptly contracted; stems branched or not branched
→ 2
2. Plants 30–50 cm; stems not branched; petiole lengths 1–3 times blades; Utah
var. intermedia
2. Plants 10–35 cm; stems frequently 1–3 times branched; petiole lengths 1–2 times blades; Idaho, Montana, Nevada, Wyoming
var. paysonii
Source FNA vol. 20, p. 598. FNA vol. 20, p. 584.
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. 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. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Subordinate taxa
P. dimorphophylla var. dimorphophylla, P. dimorphophylla var. intermedia, P. dimorphophylla var. paysonii
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)
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