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2. Pollination biology of Calypso bulbosa var. occidentalis (Orchidaceae): a food-deception system;Ackerman;Madroño,1981
3. Studies in the family Orchidaceae;Ames,1922
4. Post pollination phenomena in orchid flowers;Arditti;Australian Orchid Review,1969
5. Post-pollination phenomena in orchid flowers;Arditti;Orchid Review,1976a