Kingdom: Plantae (2659)
Phylum: Tracheophyta (2572)
Class: Magnoliopsida (2167)
Order: Myrtales (76)
Family: Onagraceae (16)(family description)
Genus: Ludwigia (6)
Epithet: decurrens Walter (1)
decurrens => decurrent (as a leaf descending down a stem)