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Great Plains ragwort

Bolander's groundsel, Bolander's ragwort

Habit Annuals, 20–50+ cm; taprooted (caudices ascending to erect). Perennials, 20–50+ cm; fibrous-rooted (caudices creeping).
Stems

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

1 or 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.

(and proximal cauline) petiolate;

blades ± orbiculate to oblong, or lyrate (lateral lobes 1–3 pairs, sinuses usually rounded, midribs usually winged), 50–120+ × 30–70+ mm, bases cordate to subcordate, margins shallowly to deeply incised.

Cauline leaves

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

gradually reduced (petiolate or sessile and clasping; lanceolate, incised).

Peduncles

bracteate, glabrous.

ebracteate or inconspicuously bracteate, glabrous.

Ray florets

8 or 13;

corolla laminae 3–7 mm.

8 or 13;

corolla laminae 10–15+ mm.

Disc florets

30–45(–100+);

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

30–45+;

corolla tubes 3–4 mm, limbs 3.5–4.5 mm.

Phyllaries

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

(8), 13, or 21, dark green, 5–8 mm, glabrous or sparsely tomentose proximally.

Calyculi

inconspicuous or 0.

conspicuous.

Heads

4–25+ in corymbiform arrays.

8–15+ in corymbiform or subumbelliform arrays.

Cypselae

1–1.5 mm, hirtellous on ribs;

pappi 3–5 mm.

2.5–3.5 mm, glabrous;

pappi 5–7 mm.

2n

= 46.

= 46.

Packera tampicana

Packera bolanderi

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
CA; OR; WA
[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).

The two varieties of Packera bolanderi have been treated as species. The morphologic characteristics used to distinguish the varieties vary widely within some populations. Presence or absence of multicellular hairs has been used to separate the varieties; that trait is also variable. The morphologic distinction is weak; habitat and elevation records lend support for recognizing two varieties.

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

Key
1. Basal leaves (relatively thick and turgid); phyllaries 13 or 21, 6–8+ mm, hairy proximally (hairs tan or brownish, multicelled)
var. bolanderi
1. Basal leaves (relatively thin); phyllaries 8, 13, (or 21), 5–6 mm, glabrous
var. harfordii
Source FNA vol. 20, p. 600. FNA vol. 20, p. 579.
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. 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. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Subordinate taxa
P. bolanderi var. bolanderi, P. bolanderi var. harfordii
Synonyms Senecio tampicanus, Senecio greggii, Senecio imparipinnatus Senecio bolanderi
Name authority (de Candolle) C. Jeffrey: Kew Bull. 47: 101. (1992) (A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 45. (1981)
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