EMBRYOGENESIS IN FLOWERING PLANTS 



243 



order of Ranales is considered to have given rise to sucii orders as the 

 Cruciales, Lythrales, Piperales, to gamopetalous orders such as the 

 Personales and Lamiales, and, in part, to the Monocotyledons. In some 



Fig. 59. Contrasted dicotyledon embryos 

 A-J, Daucus carota (Umbelliferae). The young embryo is markedly filamentous, 

 (after Borthwick) K-M, Sassafras variifolium (Laurales). The first division of the 

 embryo is by a vertical wall, and the embryo tends to be equidimensional 



(X 240, after Coy). 



genera of these orders embryos of the Onagrad type occur. The other 

 basic order, the Magnoliales, is thought to have given rise to the 

 Leguminosae, Rutales and Euphorbiales, and there also we find genera 

 with embryos of the Onagrad type. This type is also found in two 



