All Floras      Advanced Search
FNA Vol. 22 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 22

196. Ruppiaceae Horaninow ex Hutchinson

Ditch-grass Family

Robert R. Haynes

Herbs, annual or rarely perennial, not rhizomatous, caulescent; turions absent [present]. Leaves alternate to subopposite, submersed, sessile; sheath not persisting longer than blade, not leaving circular scar when shed, not ligulate, not auriculate; blade linear; intravaginal squamules scales, 2. Inflorescences terminal, capitate spikes, with subtending spathe, pedunculate; peduncle following fertilization often elongating, often spiraling. Flowers bisexual; subtending bracts absent; perianth absent; stamens 2, in 1 series; anthers distinct, dehiscing longitudinally; pollen arcuate; pistils 4--16, distinct, stipitate; ovules parietal, campylotropous. Fruits drupaceous. Seeds 1; embryo straight.

Genus Genera 1, species ca. 10 (2 species in the flora): nearly worldwide.

Ruppiaceae are found submersed in brackish or saline waters or fresh waters with very high calcium or sulfur ion concentrations.


Haynes, R. R. 1978. The Potamogetonaceae in the Southeastern United States. J. Arnold Arbor. 59: 170--191.

Lower Taxon


Related Objects  

Flora of China  
  • Ruppiaceae (PDF)
  • PDF

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |