Flora of the Hawaiian Islands
Monocotyledon Literature for Potamogeton foliosus
Wagner et al., 1990, 1999.
   Potamogetonaceae -- The Pondweed Family Bibliography
      Potamogeton foliosus

Common name(s): pondweed, leafy pondweed
General Information
DistributionNative to North America from Canada to Mexico and Central America, the West Indies, and Hawai`i.In the Hawaiian Islands, indigenous to Kaua`i, O`ahu, Maui, Hawai`i.

Click here for detailed USGS map by Jonathan Price
Plants completely submerged; stems slender, slightly compressed and inconspicuously winged, 2-10 dm long, many-branched, arising from a dense mat of slender rhizomes.
Leaves all similar, linear, 10-100 mm long, (0.3-)1-1.5(-2.5) mm wide, (1-)3-5-nerved, apex acute to cuspidate, attenuate to base, attached directly at the node, stipules connate into a tubular sheath, the sheath 5-15 mm long, rupturing and deciduous, with portions persistent.
Flowers few in subglobose to subcapitate spikes 1-5 mm long, peduncles stout, 3-15(-20) mm long; tepals greenish, 0.5-1 mm long.
Fruit obliquely obovoid, 1.5-2(-2.5) mm long, dorsal keel prominent, undulate-dentate, the 2 lateral keels obscure, style persistent, 0.1-0.4 mm long.
2n = 14, 26, 28