Abstract: In this paper, relationship of time -order change of subunits of seedlings in V. venosa complex and V. unijuga with flowering were analysed by ‘modula’ method from enlightenment of wild population investigation.It was discovered that some plants broke into demarcation of form between the two speices in cultivated population of V. venosa complex, i. e. when compound leaf was consisted of one pair of leaflets, plants flowered.Plants with three or four leaflets were found in wild population of V. unijuga. Hence, authors suggested that this change of form could indicate that the two species, belonging to sect. Vicilla had directive common ancestor.

Key words: V. venosa complex, V. unijuga, Form structure Biosystematics