How to Cite

Dodson, C. (2009). THE CATASETUMS (ORCHIDACEAE) OF TAPAKUMA, GUYANA. Selbyana, 2(2/3), 159–168. Retrieved from


Six to eight species of Catasetum occur on the coastal plain of Guyana, on the northeastern perimeter of South America. Four species - Catasetum macrocarpum L. C. Richard ex Kunth, Catasetum discolor Lindl., Catasetum longifolium Lindl., and Catasetum thompsonii Dodson - which are frequent on the coast, also occur along the Tapakuma River in the Essequibo District of Guyana. The other species occur in the inland areas, particularly in the savannah country. The four species under consideration are markedly different in their growth habits and in their habitat preferences, and are thereby easily distinguished. No natural hybrids had been recognized between the four species and it was assumed that the species had isolating mechanisms which kept them distinct even though they were known to occur together in the same regions in South America.


Open Access and Copyright Notice


Selbyana is committed to real and immediate open access for academic work. All of Selbyana's articles and reviews are free to access immediately upon publication. There are no author charges (APCs) prior to publication, and no charges for readers to download articles and reviews for their own scholarly use.  To facilitate this, Selbyana depends on the financial backing of the Marie Selby Botanical Gardens, the hard work and dedication of its editorial team and advisory board, and the continuing support of its network of peer reviewers and partner institutions.

Authors are free to choose which open license they would like to use for their work. Our default license is the Creative Commons Attribution-NonCommercial 4.0 (CC BY-NC 4.0). While Selbyana’s articles can be copied by anyone for noncommercial purposes if proper credit is given, all materials are published under an open-access license with authors retaining full and permanent ownership of their work. The author grants Selbyana a perpetual, non-exclusive right to publish the work and to include it in other aggregations and indexes to achieve broader impact and visibility.

Authors are responsible for and required to ascertain that they are in possession of image rights for any and all photographs, illustrations, and figures included in their work or to obtain publication or reproduction rights from the rights holders. Contents of the journal will be registered with the Directory of Open Access Journals and similar repositories. Authors are encouraged to store their work elsewhere, for instance in institutional repositories or personal websites, including commercial sites such as, to increase circulation (see The Effects of Open Access).