ALLIUM CEPA 



i05 



whorL (Fig. 97, E, G.) There is sometimes a lag in the develop- 

 ment of the primordia of the outer stamens; so that the first lobe 

 of the perianth may be well developed before the primordium of the 



Fig. 96. Early stages in floral development. A, longisection through growing point of 

 onion bulb. 1, i ; l, 1; 3, 3 respectively are opposite portions of leaves enclosing axis a; 

 B, primordium of axis of the inflorescence ia with involucral bract just arising ; i, i are oppo- 

 site sides of the leaf enclosing it ; C, the elongating peduncle of axis of the inflorescence show- 

 ing involucral bract ib which completely covers the central region ; D, apex of axis of the 

 inflorescence somewhat flattened with additional bracts arising within involucre; E, axis 

 of the inflorescence at about the stage of development as in B, showing unilateral development 

 of involucre ; F, G, developing flower stalks. At the base of peduncle at p another shcwt has 

 differentiated ; H, within young bracts b are raised kidney-shaped areas from which the 

 flowers develop ; /, primordia of the first flowers are shown : i, bract ; //>, flower primordia. 

 The bract covering four kidney-shaped areas has been cut away. (After Jones and Emswel- 

 ler, Hilgardia.') 



