Ranunculus verticillatus is a species of buttercup, endemic to New Zealand.
Description.
A typical "Ranunculus", with green leaves and a yellow flower. The leaves are deeply divided.
Range.
Endemic to New Zealand, known from both the North and South Island
Habitat.
Wet areas.
Ecology.
"Ranunculus verticillatus" is an indicator of wetlands.
"Phytomyza costata", a Leaf miner, uses the leaves for its mines. 
Etymology.
"verticillatus" is an adjectival form of the Latin "verticillus", which would mean 'whorled'.
Taxonomy.
Formerly, this species name was also used for other species of "Ranunculus", and was included on lists of plants from other areas, like Vermont.