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This is a native species.
Hippuris vulgaris
Hippuris vulgaris (Mare's Tail)
Plantaginaceae (Plantain) formerly Hippuridaceae (Mare's Tail Family)

Foothills, montane. Ponds, streams. Summer.
Haviland Lake Trail, July 23, 2005.

Hippuris vulgaris, often mistaken for the even more common Horsetails, is circumpolar in ponds and streams.

The pink flower in the photograph at left is that of Persicaria amphibia and the yellow is Utricularia macrorhiza.

Greek gives us both "hippo" ("horse") and "oura" ("tail"). 

Linnaeus named this genus and species in 1753 from "Habitat in Europae fontibus" (wet sources).

Hippuris vulgaris

Leaves are whorled around the solid stem. Flowers, found one in each leaf axil, have no petals and sepals are reduced to a minute rim on the ovary. One stamen protrudes in red from the cylindrical female pod.

                          

Public domain drawings were created by Carl Axel Magnus Lindman (1856 - 1928), Swedish botanist and botanical illustrator. 

Hippuris vulgaris (Mare's Tail)
Plantaginaceae (Plantain)
formerly Hippuridaceae (Mare's Tail Family)

Foothills, montane. Ponds, streams. Summer.
Haviland Lake Trail, July 23, 2005.

Hippuris vulgaris is a perennial, rhizomatous species, at least some of which is submerged.

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

Range map for Hippuris vulgaris