There's the spider plant, of course. But that is only scary if you are afraid of the idea of spiders, because the plant itself is pretty tame.
And there is the Venus fly trap and the pitcher plant. Carnivores both. But they have nothing on Audrey, from "The Little Shop of Horrors." She was the scariest plant of all time.
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If you are looking for more plants suitably scary looking for Halloween, check out this photo gallery from Garden Design magazine.
P.S. This photo is from the 1930s, the decade that brought you Dracula, Frankenstein, The Mummy, King Kong and The Bride of Frankenstein.