Published Paper Details:

Taxonomical and palynological study were carried out from February to July, 2017. A total of 10 species belonging to 7 genera were recorded in the Hojai sub division, out of which 5 species were perennial trees, 3 were large shrub and 2 were shrub. Their leaves were found to be unipinnate and peripinnately compound with pulvinous leaf bases. Inflorescence were found in either raceme or panicle type. Among the 10 taxa, six have yellow flowers and flowering time was at summer. Stamens were found to be heterodynamous.I n Cassia fistula Linn., all the10 stamens were fertile, while in others, out of the 10 stamens each, 7 were fertile and rest 3 were sterile. The fruits were represented by pod (legume). Pollen grains in most of the taxa were found to be trizonocolpate and colpi never meet each other at either pole. The shape of the grains was prolate to sub-prolate while in Delonix regia it is oblate to spheroidal and in Saracaasoca it is spheroidal. The Largest pollen grains were observed in Bauhinia tomentosa L.with a length of 3.8?m and smallest grains in Cassia javanicaLinn. and C. fistula Linn. with a length of 1.06?m. The pollen grains of all the recorded species were found to bear thin exine. Senna occidentalis Linn. had the thinnest exine with 0.098?m. and hence may be considered as highly evolved among all the 10 species under study. The taxonomic enumeration of all the taxa were done with proper description, analytical diagrams, and photographs. The palynomorphological study revealed that the pollen grains of the taxa were from non- colpate to trizonocolporate to penta- colpate. Most of them Oblate, Sub- oblate, Prolate, Sub- prolate and spheroidal in shape.