This article has restudied the Petersen family in Graph Theory. It discussed process of establishing this family. discussion leads to discovering some new properties family's members.

the tribe sophoreae sensu polhill [9,10] is a large and diverse assemblage comprising the ancient and primitive ancestral stocks of papilionoideae. the most frequent chromosome basic numbers in this tribe are x = 11 and x = 9 but chromosome numbers range from x = 8-14 are also known. in this study chromosome numbers and karyotype variation of iranian members of tribe sophoreae are reported. ira...