Journal Article Baker's law Research Support, U.S. Gov't, Non-P.H.S. Costus Plant Nectar Research Support, Non-U.S. Gov't Review biogeography breeding systems colonization convergent evolution ecological filtering floral symmetry floral traits hummingbird pollination invasive species island island biogeography life‐history traits mainland mate limitation metapopulation orchid bees pollination syndromes pollinator limitation range expansion reproductive assurance self-incompatibility tropical biology