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Eschscholtz's buttercup

Eschscholtz's buttercup, snow buttercup, subalpine buttercup

Roots

slender, 0.4-1.6 mm thick.

Stems

caudex 2.5-4.5 cm, densely clothed with persistent leaf bases.

erect or decumbent from short or long caudices, 4-27 cm, glabrous, each with 1-3 flowers.

Basal leaves

persistent, blades reniform or cordate to obovate or broadly oblong, lobed or 3-parted, 0.5-4.1 × 0.8-3.7 cm, segments again 1(-2)×-lobed, base obtuse to cordate, apices of segments rounded in outline.

Basal leaf blades

reniform, shallowly 5-9-lobed or sometimes 3-parted with lateral segments again lobed, 1.5-1.5 × 0.8-2 cm, base truncate, middle segment unlobed, ultimate segments and sinuses rounded or obtuse.

Flowers

petals 6-13 mm.

pedicels glabrous;

receptacle glabrous or sparsely pilose;

sepals 4-8 × 2-6 mm, abaxially glabrous or pilose;

petals 5-8, 6-16 × 4-16 mm;

nectary scale glabrous.

Heads of achenes

cylindric or ovoid, 5-10 × 4-7 mm;

achenes 1.4-2 × 1-1.6 mm, glabrous or sparsely pubescent;

beak lanceolate or subulate, straight (sometimes curved when immature), 0.6-1.8 mm.

Ranunculus eschscholtzii var. oxynotus

Ranunculus eschscholtzii

Phenology Flowering summer (Jul–Sep).
Habitat Open rocky alpine slopes and meadows
Elevation 2900-4000 m (9500-13100 ft)
Distribution
from FNA
CA; NV
[BONAP county map]
from FNA
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT; YT
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 6 (5 in the flora).

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

Key
1. Ultimate segments and sinuses of basal leaves acute or acuminate.
→ 2
1. Ultimate segments and sinuses of basal leaves rounded or obtuse (sometimes broadly rounded-acute).
→ 3
2. Leaf blade reniform, base truncate or cordate.
var. suksdorfii
2. Leaf blade obovate to broadly oblong, base obtuse or rounded.
var. eximius
3. Middle segments of many basal leaves lobed and toothed or 2×-lobed.
var. trisectus
3. Middle segments of basal leaves unlobed or 1×-lobed.
→ 4
4. Caudices with few or no persistent leaf bases; basal leaves always 3-parted; widespread in w North America.
var. eschscholtzii
4. Caudices densely clothed with persistent leaf bases; basal leaves sometimes parted but usually merely lobed; California and w Nevada.
var. oxynotus
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes > Ranunculus eschscholtzii Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes
Sibling taxa
R. eschscholtzii var. eschscholtzii, R. eschscholtzii var. eximius, R. eschscholtzii var. suksdorfii, R. eschscholtzii var. trisectus
R. abortivus, R. acriformis, R. acris, R. adoneus, R. alismifolius, R. allegheniensis, R. allenii, R. ambigens, R. andersonii, R. aquatilis, R. arizonicus, R. arvensis, R. auricomus, R. austro-oreganus, R. bonariensis, R. bulbosus, R. californicus, R. canus, R. cardiophyllus, R. cooleyae, R. cymbalaria, R. fascicularis, R. fasciculatus, R. ficaria, R. flabellaris, R. flammula, R. gelidus, R. glaberrimus, R. glacialis, R. gmelinii, R. gormanii, R. harveyi, R. hebecarpus, R. hederaceus, R. hispidus, R. hydrocharoides, R. hyperboreus, R. hystriculus, R. inamoenus, R. jovis, R. kamtschaticus, R. lapponicus, R. laxicaulis, R. lobbii, R. macauleyi, R. macounii, R. macranthus, R. marginatus, R. micranthus, R. muricatus, R. nivalis, R. occidentalis, R. oresterus, R. orthorhynchus, R. pacificus, R. pallasii, R. parviflorus, R. pedatifidus, R. pensylvanicus, R. platensis, R. populago, R. pusillus, R. pygmaeus, R. ranunculinus, R. recurvatus, R. repens, R. rhomboideus, R. sabinei, R. sardous, R. sceleratus, R. sulphureus, R. testiculatus, R. trilobus, R. triternatus, R. turneri, R. uncinatus
Subordinate taxa
R. eschscholtzii var. eschscholtzii, R. eschscholtzii var. eximius, R. eschscholtzii var. oxynotus, R. eschscholtzii var. suksdorfii, R. eschscholtzii var. trisectus
Synonyms R. oxynotus
Name authority (A. Gray) Jepson: Fl. Calif. 1: 537. (1922) Schlechtendal: Animadv. Bot. Ranunc. Cand. 2: 16. (1820)
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