Flora of the Hawaiian Islands
Monocotyledon Literature for Pistia stratiotes
Wagner et al., 1990, 1999.
   Araceae -- The Aroid, Duckweed, Philodendron Family Bibliography
      Pistia stratiotes
General Information
DistributionPantropical.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Maui, Hawai`i.

Free-floating, aquatic herbs, spreading by stolons.
Leaves pale green, simple, rosulate, obovate to oblong-cuneate, 3-15 cm long, 1.5-8 cm wide, broadest at apex, with 5-7 conspicuous parallel nerves, villous, apex broadly rounded to truncate or often emarginate, base cuneate to attenuate, sessile.
Inflorescences inconspicuous, axillary; spathe white, pubescent externally, glabrous within, the tube ovoid, the limb ovate, acute at apex; spadix white, minute, included, bearing 2-8 staminate flowers and a solitary pistillate flower.
Berries ovoid to ellipsoid, with persistent stigma.
Seeds numerous, cylindrical, sessile.
2n = 28