Tiagi, Y D Modern text book of botany . : Plant physiology ecology cytology genetics plant evolution / VOL. IV. by Y D Tiagi & S B Agarwal . - 1st ed. - Patna: Universel publication, 1984. - 513p.: 18cm. Ques. paper . Subjects--Index Terms: Specific topics in natural history. Botany Dewey Class. No.: 581