Flora of the Hawaiian Islands
Monocotyledon Literature for Egeria densa
Wagner et al., 1990, 1999.
   Hydrocharitaceae -- The Frog's-bit Family Bibliography
      Egeria densa
General Information
DistributionNative to South America but widely escaped from cultivation in various places, including North America, Europe, and Japan.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Maui, Hawai`i.

Stems terete, 2-3 mm in diameter.
Lower leaves in whorls of 3, ovate or narrowly ovate, 3-7 mm long, 1.5-2 mm wide, middle and upper leaves in whorls of 4-5, oblong to linear, 12-40 mm long, 1.7-5 mm wide, margins serrulate.
Staminate flowers borne in spathes in the upper leaf axils, 11-12 mm long, on a long thread-like hypanthium 30-60 mm long, sepals 3-4 mm long, petals 9.5-11 mm long; pistillate flowers not seen.
2n = 48