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Fendler's ragwort, notchleaf groundsel

cut-leaf butterweed, wide-head groundsel

Habit Perennials, 10–40+ cm; rhizomatous (rhizomes horizontal to suberect, branched). Perennials, 20–50+ cm, taprooted (caudices branched, ascending to erect, woody).
Stems

1 or multiple (crowded to subcespitose), floccose-tomentose or glabrescent.

1 or, usually, multiple, clustered, densely tomentose to glabrescent.

Basal leaves

petiolate;

blades lanceolate to oblanceolate, 30–60+ × 10–30+ mm, bases tapering, margins shallowly, evenly pinnatifid to pinnatisect or wavy (adaxial faces floccose-tomentose or subglabrescent).

(soon withering), petiolate;

blades lyrate (lateral lobes 2–6+ pairs), ovate, obovate, or spatulate, 70–100+ × 20–30+ mm, bases tapering, ultimate margins irregularly and coarsely serrate-dentate.

Cauline leaves

gradually reduced (sessile; lanceolate to oblanceolate, pinnatisect to wavy).

gradually reduced (± petiolate, proximal and mid similar to basal, terminal lobes smaller than laterals; distal sessile, incised).

Peduncles

bracteate, densely to irregularly floccose.

bracteate, sparsely to densely lanate-tomentose.

Ray florets

6–8+;

corolla laminae 5–7 mm.

8 or 13;

corolla laminae 10–15 mm.

Disc florets

30–40+;

corolla tubes 2.5–3 mm, limbs, 2.5–3.5 mm.

35–50+;

corolla tubes 3.5–4.5 mm, limbs 2.5–3.5 mm.

Phyllaries

13, green, 5–7 mm, floccose proximally to glabrescent distally.

13 or 21, green (tips sometimes yellow), 8–10+ mm, densely tomentose proximally, glabrescent distally.

Calyculi

0 or inconspicuous (bractlets red-tinged).

inconspicuous (bractlets tomentose).

Heads

6–25+ in open or compact, corymbiform arrays.

5–20+ in open or compact (rarely), cymiform arrays.

Cypselae

2.5–3 mm, glabrous;

pappi 4–5 mm.

1–1.5 mm, glabrous;

pappi 6–7 mm.

2n

= 46.

= 46.

Packera fendleri

Packera eurycephala

Phenology Flowering late May–early Oct.
Habitat Steep slopes, loose, dry rocky or gravelly soils, along streams, open forests, disturbed sites
Elevation 1600–3200 m (5200–10500 ft)
Distribution
from FNA
CO; NM; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Packera fendleri is abundant, almost weedy in the southern Rocky Mountains. It thrives in a wide range of elevations and in a wide variety of habitats; flowering times vary. It frequently grows in close association with other species of Packera and may hybridize with them.

(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. Stems (1–)2–6; leaf blades: margins usually serrate-dentate, sometimes deeply dissected, midribs winged
var. eurycephala
1. Stems 1; leaf blades finely dissected, lateral lobes also dissected, midribs not or weakly winged
var. lewisrosei
Source FNA vol. 20, p. 587. FNA vol. 20, p. 586.
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. 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
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. 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. eurycephala var. eurycephala, P. eurycephala var. lewisrosei
Synonyms Senecio fendleri, Senecio canovirens, Senecio fendleri var. molestus, Senecio nelsonii, Senecio rosulatus, Senecio salicinus Senecio eurycephalus
Name authority (A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981)
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