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| Kingdom Plantae |
| |
Ruppia L. -- accepted -- widgeonweed |
| |
Ruppia anomala Ostenf. -- not accepted -- yerba de zanja |
| |
Ruppia cirrhosa (Petagna) Grande -- accepted -- spiral ditchgrass |
| |
Ruppia cirrhosa ssp. occidentalis (S. Watson) Á. Löve & D. Löve -- not accepted |
| |
Ruppia didyma Sw. ex Wikstr. -- accepted |
| |
Ruppia maritima L. -- accepted -- widgeongrass, widgeon-grass |
| |
Ruppia maritima var. brevirostris J. Agardh -- not accepted |
| |
Ruppia maritima var. exigua Fernald & Wiegand -- not accepted |
| |
Ruppia maritima var. intermedia (Thed.) Asch. & Graebn. -- not accepted |
| |
Ruppia maritima var. longipes Hagstr. -- not accepted |
| |
Ruppia maritima var. maritima L. -- not accepted -- widgeonweed |
| |
Ruppia maritima var. obliqua (Schur) Asch. & Graebn. -- not accepted |
| |
Ruppia maritima var. occidentalis (S. Watson) Graebn. -- not accepted |
| |
Ruppia maritima var. pacifica H. St. John & Fosberg -- not accepted |
| |
Ruppia maritima var. rostrata J. Agardh -- not accepted |
| |
Ruppia maritima var. spiralis (Dumort.) Moris -- not accepted |
| |
Ruppia maritima var. subcapitata Fernald & Wiegand -- not accepted |
| |
Ruppia occidentalis S. Watson -- not accepted |
| |
Ruppia pectinata Rydb. -- not accepted |
| |
Ruppia spiralis Dumort. -- not accepted |
| |
Ruppiaceae -- accepted -- ditch grass, ditchgrass, ditch-grass |
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