Michael Grayum 8655 Det. by: G. Crow, VII 1990 Phenology: ST 29 July 1988 10:26N 84:01W 50 m HEREDIA, SARAPIQUI Estación Biológica La Selva Llanura de San Carlos. Completely submerged aquatics in ca. 0.8 m of water, rooted in bottom of Quebrada El Salto ca. 150 m upstream from Sendero Suampo bridge. Lvs. distichous, plane (the margins not undulate.) Sterile collection. Brought in by Greg Browder.
Orlando Vargas 397 Det. by: M. Grayum, X 1990 Phenology: FL 31 August 1990 10:28N 84:00W 100 m HEREDIA, SARAPIQUI Llanura de San Carlos. Hierba acuática flotante. Flores púrpura Frutos verdes, muy espinosos.
Gerardo Herrera 1794 Det. by: G. Crow, 1990 Phenology: FL 14 April 1988 10:59N 85:07W 40 m ALAJUELA, UPALA Llanura de Guatuso. Hierba flotante. Tallo café-rojizo. Flores lila con mancha amarillenta.