as compared to other plants, xerophytes have an inverted stomatal rhythm. during the day and especially during mid-day when the sun is at its peak, most stomata of xerophytes are close. not only do more stomata open at night in the presence of mist or dew, the size of stomatal opening or aperture is larger at night compared to during the day. this phenomenon was observed in xeromorphic species of cactaceae, crassulaceae, and liliaceae.