Flora of North America species comparison

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Ranunculus bonariensis

Ranunculus bonariensis var. trisepalus

Carter's buttercup
Photo is of parent taxon

Carter's buttercup, vernal pool buttercup
Roots

not thickened basally, glabrous.
Stems

erect or decumbent, rooting at proximal nodes, glabrous.
Proximal cauline leaf blades

elliptic to ovate, 0.8-2.3 × 0.5-1.2 cm, base rounded or obtuse, margins entire to finely denticulate, apex broadly rounded-acute to rounded.
Inflorescences

bracts elliptic to ovate.
Flowers

receptacle glabrous;

sepals 3, spreading or reflexed from base, 1.5-3 × 0.5-2 mm, glabrous;

petals 1-3, 1.5-2.5 × 0.5-1 mm;

nectary scales glabrous.
Heads of achenes

globose to ovoid, 2-5 × 2-4 mm;

achenes 1.4-1.8 × 1-1.2 mm, smooth, glabrous;

beak absent.

Ranunculus bonariensis

Ranunculus bonariensis var. trisepalus
Phenology Flowering spring (Mar–May).
Habitat Vernal pools and edges of streams
Elevation 30-1000 m (100-3300 ft)
Distribution
from FNA
CA; temperate South America
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; South America
[BONAP county map]
Discussion

Varieties 3 (1 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula > Ranunculus bonariensis
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. 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. 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. bonariensis var. trisepalus
Synonyms R. trisepalus, R. alveolatus
Name authority Poiret: in J. Lamarck et al., Encycl. 6: 102. (1804) (Gillies ex Hooker & Arnott) Lourteig: Darwiniana 9: 465. (1951)
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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