A number of angiosperm families have achieved the requisite adaptations to colonize forest canopy habitats and several of these done so with considerable redundancy. Genera such as Anthurium, Oncidium and Tillandia contain hundreds of arboreal members, including many with similar growth forms and what appear to be the same fundamental vegetative adaptations to canopy life. Not uncommonly, two or more taxa are so alike in appearance as to be unidentifiable without sexual material. Often groups of such species are sympatric and occupy the same kinds of bark surfaces (hosts) in apparent defiance of the prevalent notion that distinct populations must occupy separate spatial niches in order to exploit common habitats
over prolonged periods of time.
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