Abstract
The largely tropical Podostemaceae occur in a unique habitat for angiosperms: attached to rocks in river rapids and waterfalls. Little taxonomic work has been published on New World Podostemaceae since Van Royen's monograph in the early 1950s. A paucity of complete herbarium material severely limits taxonomic study and precludes addressing a range of enigmatic ecological and evolutionary issues that relate to the family. The size, high level of endemism, and life history of the family are discussed. The distributions of two species in Mexico are used to illustrate the need for concerted collecting efforts. Recommendations for collection strategies are made that reflect the unusual habitat and life history of these plants.
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