Flora of the Hawaiian Islands
Monocotyledon Literature for Eichhornia crassipes
Lorence & Wagner, 2020.
   Pontederiaceae -- The Pickerel Weed Family Bibliography
      Eichhornia crassipes
General Information
DistributionNative to the Neotropics, widely naturalized and a troublesome weed that interferes with navigation in some areas.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Lana`i, Maui, Hawai`i.

Perennial aquatic herb.
Leaves in a basal rosette, blade leathery, ovate to orbicular, usually 3.5‒16 cm long, 4‒14 cm wide, petiole usually 7‒30 cm long, inflated near base.
Inflorescences a scape, 1‒4 dm long, with a conspicuous sheath near middle. Flowers numerous, perianth violet, tube curved, 1.5‒2 cm long, lobes obovate to elliptic, 3.5‒4 cm long, upper lobe enlarged and with a patch of blue with a yellow center.
Seeds oblong-cylindrical, ribbed, ca. 1.5 mm long, 0.6–0.7 mm wide.
2n = 30, 32, 58.
Nancy Khan