STUDIES ON THE MEGASPOROGENESIS AND MICROSPOROGENESIS AND THE DEVELOPMENT OF THEIR FEMALE AND MALE GAMETOPHYTE IN ELEUTHEROCOCCUS BRACHYPUS The pollination biology of Phrynium oliganthum (Marantaceae) FLOWERING PATTERN AND PROTANDRY IN BOESENBERGIA LONGIFLORA Floral sex allocation and flowering pattern in the andromonocious Soranthus meyeri (Apiaceae)