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splitleaf groundsel

Habit Perennials, 10–30+ cm; fibrous-rooted (caudices horizontal to erect, relatively short and stout).
Stems

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

Basal leaves

(relatively thick and turgid) petiolate (petioles broad-winged or narrow, delicate);

blades ovate, ovate-orbiculate, oblong-lanceolate, orbiculate, suborbiculate, reniform, or subreniform, 10–50+ × 10–40 mm, bases tapering or subcordate to abruptly contracted, margins entire or crenate.

Cauline leaves

gradually reduced (proximal and mid sometimes as large as or larger than basal, sessile, oblanceolate to obovate, sometimes lyrate, sometimes auriculate and/or clasping, subentire to irregularly dissected; distal usually sessile, bractlike, sometimes larger).

Peduncles

inconspicuously bracteate or ebracteate, glabrous.

Ray florets

8 or 13;

corolla laminae (deep yellow to orange) 5–8+ mm.

Disc florets

45–60+;

corolla tubes 2–3 mm, limbs 2.5–3.5 mm.

Phyllaries

(8–)13 or 21, green (tips cyanic), 5–7+ mm, glabrous.

Calyculi

conspicuous (bases of bractlets swollen).

Heads

1–6+ in congested, corymbiform or subumbelliform arrays.

Cypselae

0.75–1.5 mm, glabrous, pappi 3–4 mm.

2n

= 46.

Packera dimorphophylla

Distribution
from FNA
CO; ID; MT; NM; NV; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Key
1. Basal leaves: petioles broad-winged, blades ovate to oblong-lanceolate, bases tapering; stems usually not branched
var. dimorphophylla
1. Basal leaves: petioles narrowly, if at all winged, blades suborbiculate, orbiculate, ovate-orbiculate, subreniform, or reniform, bases subcordate to abruptly contracted; stems branched or not branched
→ 2
2. Plants 30–50 cm; stems not branched; petiole lengths 1–3 times blades; Utah
var. intermedia
2. Plants 10–35 cm; stems frequently 1–3 times branched; petiole lengths 1–2 times blades; Idaho, Montana, Nevada, Wyoming
var. paysonii
Source FNA vol. 20, p. 584.
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. 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. dimorphophylla var. dimorphophylla, P. dimorphophylla var. intermedia, P. dimorphophylla var. paysonii
Synonyms Senecio dimorphophyllus
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981)
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