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Labrador buttercup, prairie buttercup, prairie crowfoot

bur buttercup, hornseed buttercup, tubercled crowfoot

Roots

slender, 0.8-1.8 mm thick.

Stems

erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers.

erect or ascending, not rooting nodally, villous, not bulbous-based.

Basal leaves

persistent, blades ovate to rhombic, undivided or rarely innermost 3-parted, 1.1-5.3 × 0.9-3.6 cm, base obtuse, margins crenate with 5 crenae, apex rounded.

blades broadly spatulate in outline, 1-2x-dissected, 0.9-3.8 × 0.5-1.5 cm, segments linear, margins entire, apex obtuse to acuminate.

Flowers

pedicels pilose;

receptacle pilose;

sepals 4-6 × 1.5-3 mm, abaxially pilose, hairs colorless;

petals 5, 6-8 × 2-4 mm;

nectary scale glabrous.

receptacle glabrous;

sepals spreading, 3-6 × 1-2 mm, villous;

petals yellow, 3-5 × 1-3 mm.

Heads of achenes

depressed-globose, 4-6 × 5-7 mm;

achenes 1.8-2.2 × 1.2-1.8 mm, glabrous;

beak slender, curved, 0.2-0.3 mm.

cylindric, 9-16(-27) × 8-10 mm;

achenes 1.6-2 × 1.8-2 mm, tomentose;

beak persistent, lanceolate, 3.5-4.5 mm.

Tuberous

roots absent.

2n

= 16.

Ranunculus rhomboideus

Ranunculus testiculatus

Phenology Flowering spring (Apr–Jun). Flowering spring (Apr–May).
Habitat Prairies, or occasionally open woods or thickets Disturbed areas, especially in grassland
Elevation 0-900 m (0-3000 ft) 400-2500 m (1300-8200 ft)
Distribution
from FNA
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; CO; IA; ID; KS; MN; MO; MT; ND; NE; NM; NV; OH; OR; SD; UT; WA; WY; BC; SK; native to Eurasia [Introduced in North America]
[WildflowerSearch map]
Discussion

In addition to the range given above, L. D. Benson (1948) cited nineteenth-century specimens from Quebec, New York, Massachusetts, and Rhode Island. No modern specimens have been seen from those areas.

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

In North America, Ranunculus testiculatus seems to be expanding its range rapidly in arid and semiarid areas. A second species of this subgenus, R. falcatus Linnaeus [Ceratocephala falcata (Linnaeus) Persoon], has been reported from North America, but all reports seem to be based on misidentified material of R. testiculatus.

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

Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes Ranunculaceae > Ranunculus > subg. Ceratocephala
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. 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. 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. 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. trilobus, R. triternatus, R. turneri, R. uncinatus
Synonyms Ceratocephalus orthoceras, Ceratocephalus testiculatus
Name authority Goldie: Edinburgh J. Sci. 6: 329. (1822) Crantz: Stirp. Austr. Fasc. 2: 97. (1763)
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