z88 



THE STRUCTURE OF ECONOMIC PLANTS 



elongated, protuberances. The members of this whorl lie alternate 

 to the petals and opposite the sepals. Adaxial to and at the bases 



--ax 



m se----^ 



Fig. 143. Floral development : /4, semi-diagrammatic transection of young flower show- 

 ing its relation to axis and arrangement of floral parts ; B, longisection of terminal portion 

 of axis of inflorescence showing origin of flower primordia ; C-H, longisections of stages in 

 development of flower ; D and E, sections which pass through median or outer pair of sepals 

 and include segments of inner pair (G and H are oriented in plane parallel to septum of ovary) ; 

 /, longisection of ovary at right angles to septum (points of divergence of ovules are not 

 shown in this plane) : ax, axis ; car, carpel ; fl p, flower primordium ; i se, inner sepal ; m se, 

 one of the median or outer sepals ; o j?, outer sepal ; w, ovule; /)?^ petal ; ;• .fr<», rudimentary 

 outer stamen; se, sepal; sep, septum; sta, stamen; sti, stigma. 



