We thank the late Mr. C. Hope, Linda Vista, Costa Rica, who provided seeds for this project. We thank Dr. A. Chautems, Conservatoire et Jardin Botaniques, Switzerland, for the comments on the native habitats, Dr. C. J. Catanzaro, Virginia State University, USA,for assistance with editing, and the Albert R. Mann Library staff at Cornell University for providing a part of the M. S. Thesis by R. J. Favretti.