Abstract
Morphological characteristics of the heterostylous subshrub, Reinwardtia indica occurring in Mandalay Division, Myanmar, were examined. The species is typically distylous, and shows dimorphism in pollen size, exine sculpture of pollen grains, stigma size and length of stigmatic papillae. Pollen grains from long-styled morphs are significantly smaller in size than those of short-styled morphs. Exine of the pollen grains from the two morphs has two kinds of processes, verrucate and spinulous ones. These processes are longer and more swollen in the short-styled morphs than in the long-styled morphs and appear more densely packed in the long-styled morphs. Unlike most of the heterostylous species, the species concerned here was characterized by having the stigmatic papillae which were obviously slender and longer in the short-styled morphs than in the long-styled morphs.
