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Gene Robinson, a bee biologist at the University of Illinois who didn't participate in the study, said it provides strong evidence that coffee and citrus plants use the caffeine strategy. Now the question is how many plants might use this trick, he said in an email. After all, bees pollinate thousands of species. Wright said in an email that other plants are now under study, but that only about 100 species can make caffeine. ___ Online: Science: http://sciencemag.org/
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