Ranunculus testiculatus |
Ranunculus sabinei |
|
---|---|---|
bur buttercup, hornseed buttercup, tubercled crowfoot |
Sabine buttercup |
|
Roots | slender, 0.3-0.8 mm thick. |
|
Stems | erect or ascending, not rooting nodally, villous, not bulbous-based. |
erect or decumbent, 1-12 cm, sparsely pilose, each with 1-3 flowers. |
Basal leaves | 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. |
persistent, blades broadly obovate to transversely elliptic, 3-lobed or -parted, 0.9-3 × 0.8-3.4 cm, segments undivided or again lobed, base obtuse, margins entire, apices of segments rounded to rounded-obtuse. |
Flowers | receptacle glabrous; sepals spreading, 3-6 × 1-2 mm, villous; petals yellow, 3-5 × 1-3 mm. |
pedicels pilose; receptacle pilose; sepals 4-7 × 2-3 mm, abaxially pilose, hairs colorless; petals 5, 5-8 × 3-4 mm; nectary scale glabrous. |
Heads of achenes | cylindric, 9-16(-27) × 8-10 mm; achenes 1.6-2 × 1.8-2 mm, tomentose; beak persistent, lanceolate, 3.5-4.5 mm. |
cylindric, 6-9 × 4 mm; achenes 1.2-1.4 × 0.8-1 mm, glabrous; beak lance-subulate, straight or curved, 0.4-0.6 mm. |
Tuberous | roots absent. |
|
2n | = 64. |
|
Ranunculus testiculatus |
Ranunculus sabinei |
|
Phenology | Flowering spring (Apr–May). | Flowering summer (Jul–Aug). |
Habitat | Disturbed areas, especially in grassland | Slopes and hummocks in tundra, in sandy or gravelly soil |
Elevation | 400-2500 m (1300-8200 ft) | 0 m (0 ft) |
Distribution |
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]
|
AK; NT; YT; Greenland |
Discussion | 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.) |
An alternative interpretation of this taxon is given by E. Hultén (1971) who considered it to be the hybrid Ranunculus nivalis × R. pygmaeus, and considered all specimens referable here to be hybrids or members of stabilized populations of hybrid origin. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ceratocephala | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes |
Sibling taxa | ||
Synonyms | Ceratocephalus orthoceras, Ceratocephalus testiculatus | R. pygmaeus subsp. sabinei |
Name authority | Crantz: Stirp. Austr. Fasc. 2: 97. (1763) | R. Brown: J. Voy. N.-W. Passage, Bot., 264. (1824) |
Web links |