Two groups of tropical vines rely for reproduction on the world's only known species of pollen-eating butterfly. Neither vine has very showy flowers, nor do their flowers have any scent. However, they don't need to attract pollinators because the Heliconius butterfly depends on the pollen produced by the vines for its food. So the butterflies don't go far from their food source.

Ref: Batten, Mary. 1983. "Sex & plants." Science Digest, Oct. p. 61. Photo: Zebra butterfly PD

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