Abstract: The floral vascular systems are compared among all four species of three genera in Adoxaceae, including Sinadoxa corydalifolia, Adoxa orientalis which have not been studied pre- viously. The vascular systems of these 4 species manifest different symmerry, and different degrees of multiplication, reduction and fusion. On the base of the evidence of floral vasculature, it can be presumed that Tetradoxa omeiensis seems to be the most primitive taxa in Adoxaceae.

Key words: Adoxaceae