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

Uinta ragwort

Habit Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). Perennials, 30–50+ cm; taprooted or ± rhizomatous (bases weakly creeping, horizontal to erect).
Stems

1, glabrous or leaf axils sparsely tomentose.

1 or 2–5+, loosely clustered, 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).

(and proximal cauline) petiolate;

blades narrowly lanceolate (pinnatifid, lateral lobes 6+ pairs, their bases petioluliform, terminal lobes smaller than laterals), 60–100 × 10–20 mm, bases tapering, ultimate margins dentate.

Cauline leaves

gradually reduced (± sessile; lacerate to subcrenate).

gradually reduced (sessile).

Peduncles

bracteate, glabrous.

bracteate or ebracteate, glabrous.

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.

40–55+;

corolla tubes 2–3 mm, limbs 2–3 mm.

Phyllaries

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

(13–)21, green (tips yellow), 4–6+ mm, glabrous.

Calyculi

conspicuous.

inconspicuous.

Heads

8–20+ in loose, corymbiform arrays.

6–20+ in corymbiform arrays.

Cypselae

1–1.5 mm, glabrous;

pappi 5–5.5 mm.

1–1.5 mm, hirtellous on ribs;

pappi 3.5–4.5 mm.

2n

= 44.

Packera schweinitziana

Packera millelobata

Phenology Flowering May–Jul. Flowering late Mar–early Jun.
Habitat Sunny, wet areas, meadows, swamps, ditches, roadsides Streambeds, openings in wooded areas on limestone-derived soils or on igneous-derived soils that are damp during growing season
Elevation 100–1800 m (300–5900 ft) 1400–2100 m (4600–6900 ft)
Distribution
from FNA
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Chihuahua, Coahuila)
[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.)

In the flora area, Packera millelobata occurs only in the trans-Pecos region of western Texas. It has been confused with P. tampicana. Their ranges overlap along the Rio Grande; P. millelobata has leaves with narrow terminal lobes; P. tampicana has terminal lobes as wide as the leaf blade. In addition, P. tampicana is annual with pronounced taproots; P. millelobata is perennial with taprooted caudices.

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

Source FNA vol. 20, p. 598. FNA vol. 20, p. 592.
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. macounii, P. malmstenii, P. millefolium, 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 millelobatus
Name authority (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
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