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This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...

Abstract Floral nectaries are essential for plant reproduction but little is known about the relationship between these secretory structures and pollination system in cacti. To test phenotypic ...

Pleurostachys Brongn. is a Neotropical genus of Cyperaceae closely related to Rhynchospora Vahl. It is found in the Atlantic and Amazon Forests from northern South America to southern Brazil and most ...