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Montana Field Guide

Montana Field Guides

Common Mare's-tail - Hippuris vulgaris

Native Species

Global Rank: G5
State Rank: S4

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Glabrous, rhizomatous, at least partly submerged perennial. Stems erect, 10–70 cm, usually simple. Leaves linear, sessile, 1–5 cm long, 6- to 12-whorled; nodes closer together on emerged portion of stem. Flowers sessile, solitary in leaf axils, perfect; calyx green, tubular; petals absent; style 1; stamen 1; ovary elliptic, ca. 1 mm long. Fruit 1-seeded achene, 1.5–2 mm long, enclosed in the calyx (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Circumboreal south to CA, NM, NE, MN and NY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 338

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Shallow water of sloughs, ponds, lakes; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Gillespie, D.M. 1966. Population studies of four species of mollusks in the Madison River, Yellowstone National Park. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 43 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Rasmussen, S.M. 1968. Composition and structure of macrophyte vegetation of the Firehole River, Yellowstone National Park as related to physical and chemical factors. M.Sc. Thesis. Bozeman, MT: Montana State University. 44 p.
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Citation for data on this website:
Common Mare's-tail — Hippuris vulgaris.  Montana Field Guide.  .  Retrieved on , from