Unidentified Life Form 45 is a green species of "durable plantform" seen in numerous rooms in the Temple Grounds in Metroid Prime 2: Echoes. Scanning it reveals that it is durable and adapted to a low-light environment, and was planted for decoration by the Luminoth; this may suggest that they're either a bio-engineered plant, or that they are of extraterrestrial origin.
"Bioscan complete. Durable plantform adapted to low-light environment. The presence of a plant container suggests that it was placed here for decoration, possibly by local sentients."