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In the first part, the development of a computer-based system for storing and retrieving information about botanical type specimens is described from its pilot stage to its present operational stage. The concept, purpose, and scope are explained, and the operational procedures are outlined. Ways of using and contributing to this computerized register of types, both in the short-run and in the long-run, are proposed. A statistical summary of the content of the Type Register as of 30 September 1972 is given. Over 13,000 specimens representing more than 10,000 taxa have been registered. The second part consists of a Catalog of more than 1,000 specimens representing over 600 taxa of the genus Carex (Cyperaceae), which are deposited in ten major American herbaria, and the Catalog is cross-indexed five different ways: by author, publication date, collector, country, and herbarium. An introduction summarizes the preparation and editing of the Catalog. This Carex Catalog represents the first published installment of the Type Register and as such is intended to serve as an example.

Acacia --- Ants --- Ecology

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Acacia --- Ants --- Ants. --- Ecology --- Morphology. --- Ecology. --- Central America.