N. Nageswara Rao Lecturer, Government College (A), Rajamahendravaram- 533105, Andhra Pradesh., India
M. Eswara Lakshmi Kumari Lecturer, GCW (A), Guntur- 522001, Andhra Pradesh, India.
Y. T. Rajesh Babu Research scholar, Dept. of Botany, Andhra University, Visakhapatnam- 530003, A.P., India
S. B. Padal Professor, Dept. of Botany, Andhra University, Visakhapatnam- 530003, A.P., India