Ranunculus longirostris

Ranunculus longirostris, the longbeak buttercup,^[1] is an aquatic plant in the buttercup family.

Ranunculus longirostris
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Ranunculales
Family:	Ranunculaceae
Genus:	Ranunculus
Species:	R. longirostris
Binomial name
Ranunculus longirostris Godr.
Synonyms[1]
Batrachium circinatum (Sibth.) Rchb. Batrachium circinatum (Sibth.) Rchb. ssp. subrigidum (W. Drew) Á. Löve & D. Löve Batrachium longirostre (Godr.) F.W. Schultz Ranunculus amphibius James Ranunculus aquatilis L. var. diffusus With. p.p.[2] Ranunculus aquatilis L. var. longirostris (Godr.) G. Lawson Ranunculus aquatilis L. var. subrigidus (W. Drew) Breitung Ranunculus circinatus auct. non Sibth. Ranunculus circinatus Sibth. var. subrigidus (W. Drew) L.D. Benson Ranunculus subrigidus W. Drew Ranunculus usneoides Greene

This species is native to Canada and the United States, where it is widespread. However, it is absent from most of the Southeastern United States.^[3] It is found in a diversity of freshwater aquatic habitats, often in streams with slow moving water.^[4]

There has been some difficulty in separating this species from the closely related Ranunculus trichophyllus, due in part to the lack of preservation of critical features on herbarium specimens.^[5]