Palynology of some bignoniaceae species in northeastern Thailand

Abstract

The pollen grains of 10 species of the family Bignoniaceae in the Northeastern Thailand namely Crescentia cujete, Fernandoa adenophylla, Millingtonia hortensis, Oroxylum indicum, Pachyptera hymenaea, Pyrostegia venusta, Radermachera ignea, Spathodea campanulata, Tecoma stans and Tecomaria capensis were examined under light and scanning electron microscopy. The studied pollen grains are monad with bilateral or radical symmetry; isopolar or non-polar; perisyncolpate, 3-colpate, 3-colporate or 3,4-colporate; subangular, sub-spheroidal or prolate, polar axis 17.5-50 μm, equatorial diameter 22.5-75 μm in size. The exine sculpturing is microreticulate, microreticulate- recticulate or lopho-recticulate.