Triffid

Janette Scott and a triffid in The Day of The Triffids

A Triffid (Triffidus celestus) is a fictitious tall, mobile, prolific and highly venomous plant species, the titular antagonist in John Wyndham's 1951 novel The Day Of The Triffids and the 1962 film adaptation. Triffids are mentioned in "Science Fiction, Double Feature".