Flora of North America species comparison

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Packera eurycephala

cut-leaf butterweed, wide-head groundsel
Habit Perennials, 20–50+ cm, taprooted (caudices branched, ascending to erect, woody).
Stems

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

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

bracteate, sparsely to densely lanate-tomentose.
Ray florets

8 or 13;

corolla laminae 10–15 mm.
Disc florets

35–50+;

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

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

inconspicuous (bractlets tomentose).
Heads

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

1–1.5 mm, glabrous;

pappi 6–7 mm.
2n

= 46.

Packera eurycephala
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

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. 586.
Parent taxa 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. 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 eurycephalus
Name authority (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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