1. Mechanisms and evolution of food-deceptive pollination systems in orchids;Ackerman;Lindleyana,1986
2. An orchid flora of Puerto Rico and the Virgin Islands;Ackerman;Memoirs of the New York Botanical Garden,1995
3. Patterns and maintenance of extraordinary variation in the Caribbean orchid, Tolumnia (Oncidium) variegata;Ackerman;Systematic Botany,1991
4. Reproductive biology of Oncidium variegatum: moon phases, pollination and fruit set;Ackerman;American Orchid Society Bulletin,1985
5. Genetic variation in a widespread, epiphytic orchid: where is the evolutionary potential?;Ackerman;Systematic Botany,1999