Small mobile plants native to the planet Phylos whose touch delivers a deadly poison, one of which nearly kills Sulu in the animated episode The Infinite Vulcan.
The retlaw plant is a small growth from Phylos that looks rather like a puffball on legs and can scuttle about under its own power. It defends itself with a fast-acting poison that is fatal to humans.
It appears in The Infinite Vulcan in 2269. While the landing party explores the apparently deserted planet, Hikaru Sulu spots one of the plants moving, picks it up out of curiosity and is stung. McCoy can do nothing for him, and he is close to death within moments.
The intelligent plant people of Phylos, led by Agmar, then reveal themselves and cure Sulu with a native remedy. The name is Walter spelled backwards, a nod to the episode's writer, Walter Koenig.