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beak ditch-grass, ditch grass, ruppie maritime, sea ditch-grass, spiral ditch-grass, western ditch-grass, widgeon-grass, wigeongrass


to 50 cm × 0.1–0.7 mm.


6–10.5 cm;

blade 0.3–0.5 mm, apex ± obtuse.


peduncles with 0–3[–4] coils, 0.5–16.5 × 0.5 mm.


pistils 4–8.


1.8–2 × 0.7–1.5 mm;

gynophore 1.2–1.9 cm;

beak terminal, slightly recurved, 0.6–1 mm.


= 16.

Ruppia maritima

Phenology Flowering spring–fall.
Habitat Shallow waters of brackish streams, ditches, and lakes along ocean shore
Elevation 0–200 m (0–700 ft)
from FNA
AK; AL; CA; CT; DE; FL; GA; LA; MA; MD; ME; MS; NC; NH; NJ; NY; OR; RI; SC; TX; VA; WA; BC; NB; NF; NS; ON; PE; QC; SK; SPM; Central America; South America; coastal Mexico; West Indies; Bermuda; Eurasia; Africa; Australia
[WildflowerSearch map]
[BONAP county map]

No specimens have been seen from Washington, D. C., but the species is to be expected there.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 22.
Parent taxa Ruppiaceae > Ruppia
Sibling taxa
R. cirrhosa
Synonyms R. maritima var. brevirostris, R. maritima var. exigua, R. maritima, R. maritima var. longipes, R. maritima var. obliqua, R. maritima var. rostrata, R. maritima var. subcapitata
Name authority Linnaeus: Sp. Pl. 1: 127. (1753)
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