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sagebrush buttercup, smooth buttercup

frog's-bit buttercup, frogbit buttercup

Roots

cylindric, 1-3 mm thick.

not thickened basally, glabrous.

Stems

prostrate or ascending, 4-15 cm, glabrous, each with 1-4 flowers.

erect to prostrate, usually rooting nodally, glabrous or strigose.

Basal leaves

persistent, blades reniform or obovate to very narrowly elliptic, 0.7-5.2 × 1-2 cm, base truncate, obtuse or attenuate, margins entire or with 3 broad, apical crenae, apex rounded to acute.

Proximal cauline leaf blades

ovate to broadly ovate, 0.8-2.7 × 0.8-1.9 cm, base rounded to weakly cordate, margins entire or dentate, apex rounded or obtuse.

Inflorescences

bracts lanceolate to oblanceolate or sometimes ovate.

Flowers

pedicels glabrous or nearly so;

receptacle glabrous;

sepals 5-8 × 3-7 mm, abaxially glabrous or sparsely pilose, hairs colorless;

petals 5-10, 8-13 × 5-12 mm;

nectary scale glabrous or ciliate.

receptacle glabrous;

sepals 5, spreading or reflexed from base, 1.5-3 × 1-2 mm, glabrous;

petals 5-6, 3-5 × 1-2 mm;

nectary scales glabrous.

Heads of achenes

globose, 7-12(-20) × 6-11(-20) mm;

achenes 1.4-2.2 × 1.1-1.8 mm, usually finely pubescent;

beak subulate or lance-subulate, straight or curved, 0.4-1 mm.

hemispheric or globose, 2-4 × 3-4 mm;

achenes 1.2-1.4 × 1-1.2 mm, glabrous;

beak lanceolate to lance-filiform, straight or curved, 0.4-1 mm.

Ranunculus glaberrimus

Ranunculus hydrocharoides

Phenology Flowering late spring–summer (Jun–Aug).
Habitat Wet soil or shallow water, in marshes and edges of streams and lakes
Elevation 2000-2900 m (6600-9500 ft)
Distribution
from FNA
AZ; CA; CO; ID; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; SK
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; NM; Mexico; Central America (in Guatemala)
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

Usually only a minority of the ovaries develop, and the fruiting receptacle is completely hidden by aborted ovaries. Populations growing at high elevations (Ranunculus glaberrimus var. ellipticus) and low elevations (var. glaberrimus) are usually well differentiated, but these varieties intergrade at intermediate elevations.

The Thompson Indians rubbed the flowers or the whole plant of Ranunculus glaberrimus on arrow points as a poison (D. E. Moerman 1986).

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

Key
1. Basal leaf blades ovate to obovate, usually shallowly lobed; bracts 3-lobed, lobes equal in size; 400–2000 m.
var. glaberrimus
1. Basal leaf blades elliptic to oblanceolate, usually undivided; bracts 3-lobed, middle lobe much larger; 1200–3600 m.
var. ellipticus
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula
Sibling taxa
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. eschscholtzii, R. fascicularis, R. fasciculatus, R. ficaria, R. flabellaris, R. flammula, R. gelidus, 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
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. eschscholtzii, 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. 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. glaberrimus var. ellipticus, R. glaberrimus var. glaberrimus
Synonyms R. hydrocharoides var. stolonifer
Name authority Hooker: Fl. Bor.-Amer. 1: 12. (1829) A. Gray: Mem. Amer. Acad. Arts, ser. 2, 5: 306. (1855)
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