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Great Plains ragwort

alpine meadow butterweed, alpine meadow groundsel, Buek's groundsel, cleft-leaf groundsel, few-leaf groundsel, pale groundsel

Habit Annuals, 20–50+ cm; taprooted (caudices ascending to erect). Perennials, 10–30+ cm; fibrous-rooted and/or rhizomatous (bases relatively slender, horizontal to suberect).
Stems

1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely tomentose.

usually 1, rarely 2–3, loosely clustered, glabrous.

Basal leaves

(and proximal cauline) petiolate;

blades oblanceolate to spatulate (usually pinnately lobed, lateral lobes 1–6+ pairs, their bases petioluliform, terminal lobes usually larger than laterals, often reniform to ± orbiculate, midribs sometimes ± winged and/or toothed between the primary lobes), 40–120+ × 10–30+ mm, bases ± cuneate, ultimate margins subentire or irregularly crenate, dentate, or lobed.

petiolate;

blades ovate, obovate, or elliptic, 20–40+ × 10–30+ mm, bases tapering to contracted, margins subentire to crenate-dentate.

Cauline leaves

gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed).

abruptly reduced (sessile, often weakly clasping, dentate to subentire; distals sessile, lanceolate, weakly clasping, entire or dentate).

Peduncles

bracteate, glabrous.

sparsely bracteate or ebracteate, glabrous.

Ray florets

8 or 13;

corolla laminae 3–7 mm.

13;

corolla laminae 7–12+ mm.

Disc florets

30–45(–100+);

corolla tubes 1.5–2.5 mm, limbs (1.5–)2.5–3.5 mm.

40–55+;

corolla tubes 2.5–3.5 mm, limbs 2.5–3.5 mm.

Phyllaries

13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous.

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

Calyculi

inconspicuous or 0.

(bractlets frequently cyanic).

Heads

4–25+ in corymbiform arrays.

1(–5; sometimes subtended by 2 relatively large bractlets).

Cypselae

1–1.5 mm, hirtellous on ribs;

pappi 3–5 mm.

1.5–2.5 mm, glabrous;

pappi 4–6 mm.

2n

= 46.

= 46, 90.

Packera tampicana

Packera subnuda

Phenology Flowering Feb–Jun.
Habitat Disturbed, wet, sandy or clay sites, roadsides, stream banks, waste areas
Elevation 0–1000 m (0–3300 ft)
Distribution
from FNA
AR; KS; LA; OK; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CA; ID; MT; NV; OR; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Packera tampicana is fairly widespread along the Gulf Coastal Plain and north and in Mexico. Morphologically, P. tampicana most closely resembles P. glabella; the former grows in very wet, sandy or clay soils and open sunlight, the latter grows in drier habitats, usually in partial shade.

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

Varieties 2 (2 in the flora).

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

Key
1. Heads (1–)2–3; phyllaries reddish or cyanic, hairy (hairs reddish, multicellular)
var. moresbiensis
1. Heads 1(–3); phyllaries green (tips sometimes red), glabrous
var. subnuda
Source FNA vol. 20, p. 600. FNA vol. 20, p. 599.
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. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, 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. 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. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Subordinate taxa
P. subnuda var. moresbiensis, P. subnuda var. subnuda
Synonyms Senecio tampicanus, Senecio greggii, Senecio imparipinnatus Senecio subnudus, P. buekii, Senecio aureus var. subnudus, Senecio cymbalarioides
Name authority (de Candolle) C. Jeffrey: Kew Bull. 47: 101. (1992) (de Candolle) Trock & T. M. Barkley: Sida 18: 635. (1999)
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