Biodiversity is a multidimensional concept spanning the diversity of organismal form and function (functional diversity) together with taxonomic and genetic diversity. In the case of plants, botanical gardens have historically strived to preserve taxonomic diversity with a global scope. However, their success in preserving global functional diversity lacks testing. Given that living collections in botanical gardens span major global vegetation types and evolutionary histories, it is reasonable to expect that a species assemblage in a botanical garden is a representative random sample of global vegetation. In such a case, botanical gardens should contain global functional diversity. Testing for this could elect botanical gardens as laboratories for studying global plant functional diversity, providing a much-needed alternative in the way we study global patterns of this diversity facet.
