Pel-tar'uk is a type of plant found on the volcanic plains on the planet Vulcan.

They are low-lying bright green shrubs which produce small olive-green berries that are edible by Vulcans and Humans. However, these berries are protected by thick toxic spines which can tear through normal clothing or robes and inject a painful neural poison which causes cramping and vomiting. The poison then induces a strength-sapping fever which fogs the mind and slows the reflexes.

These spines, if carefully removed intact, are sturdy enough to be used as darts in a blowgun or flechette weapon. (Last Unicorn RPG module: The Way of Kolinahr: The Vulcans)