Hippuris

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{{Taxobox | color = lightgreen | name = Hippuris | image = Illustration Hippuris vulgaris0.jpg | image_width = 250px | image_caption = Common Mare's Tail (Hippuris vulgaris) from Thomé
Flora von Deutschland, Österreich und der Schweiz 1885 | regnum = Plantae | divisio = Magnoliophyta | classis = Magnoliopsida | ordo = Lamiales | familia = Plantaginaceae | genus = Hippuris | genus_authority = L. | subdivision_ranks = Species | subdivision =

Mountain mare's tail, Hippuris montana
Fourleafed mare's tail, Hippuris tetraphylla
Common mare's tail, Hippuris vulgaris

}}

Hippuris, the Mare's tail, used to be the sole genus in the family Hippuridaceae. Following genetic research by the Angiosperm Phylogeny Group, it has now been transferred to the family Plantaginaceae, with Hippuridaceae being reduced to synonymy under Plantaginaceae.

It includes one to three species depending on taxonomic interpertation. Some authorities only accept the first species of those listed below, treating the other two as synonyms of it:

Common mare's tail, Hippuris vulgaris
- Mountain mare's tail, Hippuris montana
- Fourleaf mare's tail, Hippuris tetraphylla

They are aquatic plants found in shallow ponds and streams, both slow-moving and fast-flowing. This flowering plant is sometimes mistakenly identified as the non-flowering horsetail.

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