Systematics of the Neotropical Rubiaceae. Treatments of the following genera are being prepared for the Flora of Ecuador: Borreria G. Mey., Diodia Gronov., Emmeorhiza Pohl ex Endl., Galianthe Griseb., Hexasepalum Bartl. ex DC., Manettia Mutis, Mitracapus Zucc., and Richardia Houst. ex L.
My professional university training was in the field of biology with specialization in systematic botany. My bachelor degree (1966) and master's degree (1968) were awarded by St. Louis University, St. Louis, Missouri. My doctoral studies were conducted at the New York Botanical Garden, and my doctoral degree was awarded by the City University of New York, New York, New York (1975). I was at the Department of Botany, Smithsonian Institution from 1975 to 1979. From 1979 to 1984, I was a professor the Universidade de Brasília, Brasília, DF, Brazil, and was tenured in 1983. I worked for the USDA Agricultural Research Service from 1984 to 2015 as a Research Botanist dealing with the systematics and nomenclature of crop plants. I retired from the Agricultural Research Service in January 2015, and have been a Research Associate in the Department of Botany, Smithsonian since that time. I am now preparing generic treatments of various Rubiaceae genera for the Flora of Ecuador.