Floral Syndrome and Breeding Systems of the Flower Color Polymorphic Plant Lagerstroemia indica Floral reward presentation favored the expression of male function in the pollen-only flower Melastoma malabathricum INTRAFLORAL STAMEN DIFFERENTIATIONS AND THEIR ADAPTIVE SIGNIFICANCES Observation on Floral Morphology and Heteranthery of Eleutherococcus senticosus (Araliaceae) Intrafloral differentiation of stamens in heterantherous flowers Pollination Biology and Breeding System of Melastoma dendrisetosum