Methyl bromide is reactively removed from air by the foliage of all 9 herbaceous, 18 deciduous, and 12 coniferous plants we have tested, in a process that appears enzymatic. Excised plant leaves yielded removal rates directly proportional to leaf surface area and first-order in CH3Br concentration from 10 ppmv to 500 pptv, the current limit of our experimental technique. Observed rate constants for different plants vary within a factor of about 100 with a lower value of 1¿10-3 hr-1 cm-2 in systems where the rate is not diffusion limited. This sink for atmospheric CH3Br could be significant in calculations of the global methyl bromide budget. ¿ 1998 American Geophysical Union