So far, I’ve identified two species of water-lily: Nymphaea puchella and the more common Nymphaea amazonum.   N. pulchella is currently flowering and has a wavy margin on it’s floating leaves, while N. amazonum hasn’t begun flowering yet and seems to have smaller leaves.  The flowers below are from N. pulchella.

Nymphaeaceae - Nymphaea pulchella and amazonum - Waterlily - 06.29.2009 - 10.11.39

OLYMPUS DIGITAL CAMERA Nymphaeaceae - Nymphaea pulchella - Waterlily - 07.02.2009 - 09.39.28