Development of the embryo in some species of the genus Delphinium L.

In the 10 examined species of Delphinium all theoretically possible types of zygote division may be found - transverse, oblique and longitudinal. With these divisions is connected the peculiar characteristic mode of differentiation of the embryo body. Embryogenesis of two species, D. tricolor and D. cariopetalum, shows a number of regularities on the basis of which new types of embryo development in angiosperms may be distinguished. These types have been named Valerianad and Ranunculad. Probably all the Delphinium species in which a longitudinal division of the zygote occurs are more primitive as regards embryonomic features than species in which zygote division is transverse or oblique