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Montana Field Guide

Montana Field Guides

Ditch-grass - Ruppia maritima
Other Names:  Ruppia cirrhosa, Ruppia spiralis

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 8

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General Description
Submersed, aquatic, rhizomatous, perennial herb. Stems filiform, branched, terete, 6–50 cm. Leaves alternate, filiform, 3–20 cm long, attached at the base to a membranous, sheathing stipule 5–20 mm long with or without a lamina to 3 cm long. Inflorescence axillary umbels of few to several 2-flowered spikes; peduncles to 30 cm long and coiled in fruit. Flowers perfect, regular; perianth absent; stamens 2; pistils 4 to 6, ovaries superior. Fruit ovoid, drupe-like, 2–3 mm long, beaked, 1-seeded, borne on a pedicel (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Cosmopolitan (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 370

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

Recency

 

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



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

References
  • Additional ReferencesLegend:   View Online Publication
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    • 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:
Ditch-grass — Ruppia maritima.  Montana Field Guide.  .  Retrieved on , from