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Ranunculus longirostris
Ranunculus longirostris.  Synonyms: Batrachium circinatum, Batrachium longirostre, Batrachium aquatile. (Water Crowfoot).
Ranunculaceae (Buttercup Family)

Montane. Lakes. Summer.
Haviland Lake, July 23, 2005.

Ranunculus longirostris is an aquatic perennial with much variation in the leaf shape and branching pattern. The underwater stem and leaves of Ranunculus longirostris are topped by half inch, five-petaled white flowers that float on the water's surface.  Plants are often numerous and quite evident even though the flowers are so small.

R. longirostris is found across the United States in ponds, lakes, ditches, and streams.

"Ranunculus" is Latin for "frog". "Longirostris" means "long-beaked" and refers to the prominent beak on the seed.

"Batrachium" is Greek for "frog", apparently alluding to the habitat and "circinatum" is Latin for "ring" or "circle" and refers to the curving of the leaves.

This is a species of many synonyms and there are still significant disagreements in classification: Kartesz (the ultimate authority for names on this web site) indicates that since the plant was photographed in Colorado, it should be called Ranunculus longirostris as this is the species of Colorado, Arizona, and New Mexico. (See range maps below.)

A Utah Flora and Intermountain Flora indicate that the species in Utah is Ranunculus aquatilis and that R. longirostris is a synonym for R. aquatilis.

In his 2001 edition of Colorado Flora Weber indicated that we have three species on the West Slope of Colorado: Batrachium longirostre, B. circinatum, and B. trichophyllum. But in his 2012 edition, Weber lumps these three species into B. aquatile (a synonym for R. aquatilis).

Kartesz indicates that R. aquatilis is a species that grows in Utah and states west and north.

Ranunculus longirostris
Ranunculus longirostris.  Synonyms: Batrachium circinatum, Batrachium longirostre, Batrachium aquatile. (Water Crowfoot).
Ranunculaceae (Buttercup Family)

Montane. Lakes. Summer.
Haviland Lake, July 23, 2005.

Range map © John Kartesz,
Floristic Synthesis of North America

State Color Key

Species present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Ranunculus aquatilis

Range map for Ranunculus aquatilis

Range map for Ranunculus longirostris