242 EMBRYOGENESIS IN PLANTS 



Veronica, Catalpa (Personales-Scrophulariaceae ; Bignoni- 



aceae) 

 Lotus, TrifoUum (Leguminosae-Papilionaceae) 

 Ruta (Rutales-Rutaceae) 

 Li Hum (Liliales-Liliaceae) 

 Juncus (Juncales-Juncaceae) 



3. Aster ad type 



Senecio (Compositae) 



Geum (Rosales-Rosaceae) 



Erodium, Oxalis, (Geraniales-Geraniaceae, Oxalidaceae) 



Polygonum (Polygonales-Polygonaceae) 



Urtica (Urticales-Urticaceae) 



Lamium (Lamiales-Labiatae) 



Muscari (Liliales-Liliaceae) 



Poa (Gramineae) 



4. Solanad type 



Includes genera from the Solanaceae (Gamopetalous Dicoty- 

 ledons), Papaveraceae, Linaceae (Geraniales), Hydnoraceae 

 (Aristolochiales) 



(All these have been referred by taxonomists to an origin in the 

 Ranales.) 



5. Chenopodiad type 



Includes Chenopodium (Chenopodiales) 

 Polemonium (Polemoniales) 

 Myosotis (Boraginales) 



(All these are either apetalous or gamopetaleous derivatives of 

 the Ranales.) 



6. Caryophyllad type 



Includes genera from the Caryophyllales, Fumariaceae 

 (Rhoeadales), Saxifragales, Lythrales, Sarraceniales, genera 

 of Leguminosae; and some monocotyledon genera. 



While the classification of embryonomic types has no doubt its 

 place in descriptive studies, and may eventually be seen to possess a 

 more fundamental value, it appears to bear little relationship to 

 angiosperm taxonomy. Several embryonomic types and variations 

 may occur within a single family; and widely separated orders and 

 families may have embryos of the same type. This is clearly seen in 

 the Table above. In Hutchinson's phyletic scheme, the basic herbaceous 



