Garrett Crow 7575 Det. by: G. Crow, VIII 1990 Phenology: 17 August 1990 08:49N 82:57W 1000 m PUNTARENAS, COTO BRUS Fila Costeña. Unicate. Small fragment found mixed with Hydrilla collection.
Garrett Crow 7585 Det. by: G. Crow, VIII 1990 Phenology: FL 21 August 1990 09:31N 84:16W 30 m PUNTARENAS, PARRITA Faja Costeña del Valle de Parrita. Submerged. Flowers yellow.
Garrett Crow 7416 Det. by: G. Crow, X 1989 Phenology: FL 20 October 1989 10:20N 85:20W 2 m GUANACASTE, BAGACES R.F.S. Dr. Rafael L. Rodrígu Valle del Tempisque. Very abundant, mixed with other vegetation, especially Neptunia plena. Submerged, individual flowers emergent. (often produces submerged cleistogamous flowers)
Garrett Crow 7450 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. Locally abundant, especially associated with Neptunia plena. Submerged.
J.F. Morales 4208 Det. by: J. F. Morales, VII 1995 Phenology: FL 17 May 1995 10:29N 83:47W 50 m LIMON, POCOCI Llanura de Tortuguero. Acuática. Corola amarilla. Común.
Garrett Crow 7612 Det. by: G. Crow, VIII 1990 Phenology: 23 August 1990 10:31N 84:28W 60 m ALAJUELA, LOS CHILES Llanura de Guatuso. Abundant, growing submersed among tall vegetation.