Cytological Studies in North-West Indian Euphorbiaceae

Abstract

Cytological studies on 22 species of Euphorbiaceae from North-West India have been made. Of these Euphorbia prolifera (n=14), Andrachne cordifolia (n=11) are being counted for the first time. Additional intraspecific cytotypes have been detected in Euphorbia milii with n=21, E. neriifolia with 2n=80 and E. pul-cherrima with n=15. Four cytotypes with 2n=60, 80, 100, 120 have been recorded in Codiaeum variegatum. Euphorbia neriifolia, Codiaeum variegatum and Achlypha wilkesiana are the polyploids with abnormal meiosis. The cytotype with n=15 of yellow variety Euphorbia pulcherrima is a tetrasomic derived from one with n=14.