The conical epidermal cells found on the petals of most Angiosperm species are so widespread that they have been used as markers of petal identity, but their function has only been analysed in recent years. Whitney et al. review the data on the roles of these cells in attracting pollinators and determine that conical cells influence flower colour, temperature, wettability and tactile properties, and so are likely to have different primary functions according to pollinator and habitat.
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