Hippuris

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Lamiales

Familia: Plantaginaceae
Tribus: Callitricheae
Genus: Hippuris
Species: H. lanceolata – H. montana – H. tetraphylla – H. vulgaris
Name

Hippuris L. Sp. Pl. 1: 4. (1753)
Type species: Hippuris vulgaris L. Sp. Pl. 1: 4. (1753)

References

Linnaeus, C. 1753. Species Plantarum 1: 4.
Govaerts, R. et al. 2020. Hippuris in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Mar. 10. Reference page.
Tropicos.org 2014. Hippuris. Missouri Botanical Garden. Published on the internet. Accessed: 2014 May 31.
International Plant Names Index. 2014. Hippuris. Published online. Accessed: May 31 2014.

Vernacular names
العربية: أفورس
azərbaycanca: Su şamcığı
беларуская: Хвоснік
čeština: prustka
dansk: Hestehale
English: Mare's Tail
فارسی: دم‌قاطری
suomi: Vesikuuset
hornjoserbsce: Truskawc
қазақша: Атқұйрықтар тұқымдасы
norsk: Hesterumpeslekta
polski: Przęstka
русский: Хвостник
slovenčina: truskavec
svenska: Hästsvansar
Winaray: Hippuris
中文: 杉叶藻科

Hippuris, the mare's tail, was previously 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 a synonym of Plantaginaceae.

It includes one to three species depending on taxonomic interpretation. 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.
References
"Hippuridaceae". Integrated Taxonomic Information System.
"Hippuris". Integrated Taxonomic Information System.