Gerardo Herrera 4258 Det. by: A. Rojas, XII 1994 Phenology: 15 July 1990 08:41N 83:33W 150 m PUNTARENAS, OSA R.F. Golfo Dulce Península de Osa. Acuático, sumergido. Follaje verde muy tenue.
Michael Grayum 8030 Det. by: R. Moran, 1988 Phenology: 27 January 1987 09:36N 82:36W 1-10 m LIMON, TALAMANCA R.N.V.S. Gandoca-Manzanillo Faja Costeña de Limón. Floating aquatics, locally abundant in open marsh at edge of grassy field behind beach. Petioles strongly inflated, especially toward base. All specimens collected from same square meter.
Garrett Crow 7548 Det. by: G. Crow, VIII 1990 Phenology: 15 August 1990 09:57N 83:49W 10 m PUNTARENAS, ESPARZA Faja Costeña de Puntarenas. Free-floating growth form, growing among Typha.
Garrett Crow 7436 Det. by: G. Crow, X 1989 Phenology: 21 October 1989 10:20N 85:20W 2 m GUANACASTE, BAGACES R.F.S. Dr. Rafael L. Rodrígu Valle del Tempisque.