Ill] 



UMBEL : CAPITULUM 



23 



centripetal, corresponding to the term acropetal used for 

 elongated inflorescences. 



Fig. 6. Umbel of Ivy (D). 



This is still more evident in the Gapitulum (Fig. 7), 

 which is a variety of the racemose type in which not only 

 is the primary axis shortened, but the secondary ones also, 

 so that the flowers come to be sessile and form a sort of 

 little head : in most cases the apex of the peduncle is 

 expanded into a flattened (Sunflower) or dome-like (Dan- 

 delion) or conical (Matricaria) receptacle on which the 

 flowers are inserted, the youngest being in the centre of 

 the disc or apex of the cone, dome, &c., and the oldest 

 outside (Fig. 7, A). 



Both in the umbel and in the capitulum the outer bracts 



