NAMED RAFFLESIA. 397 



not been examined, l^ut these two genera are parasitic on 

 roots, and liave also their stigmata remarkably developed ; 

 and although Ilq//le-sia probably differs from both of tliem 

 in having a superior ovarium, 1 have endeavoured to show 

 that this ditterencc alone would not form an insuperable 

 objection to their affinity. 



EXPLANATION OF THE PLATES RELATING TO 

 RAFFLESIA ARNOLDI. 



Plate 13 (XV.) 



The expanded Flower reduced to somewhat less than ^ of its natural size; 

 the scale given on the plate being too long by nearly f 



Plate 11 (XVI). 

 A Flower-bud covered with its bracteae, of the natural size. 



Plate 15 (XVII). -33 



The underside of the same Bud ; to show the root, the reticulate base with 

 the circular elevation in which it terminates, and the origin of the outer 

 bracteee. Natural size. 



Plate 16 (XVIII). 



Flower-bud, of which the bractea}, whose insertions are shown, arc re- 

 moved. Natural size. 



Plate 17 (XIX). 



A different vie-w of the Bud in the same state, to show the restivation and 

 veins of the segments of the perianthium. Natural size. 



Plate 18 (XX). 



Fig. 1. A vertical section of the Bud deprived of its bractero : exhibiting the 

 principal vessels of the column and perianthium, and the structure of the root, 

 especially the change in the direction, increased ramification and termination of 

 its vessels at the base of the parasite. Natural size. 



Fig. 2. One half of the vertically-divided perianthium of the same Bud,Jn 

 which the internal surface of the tube, corona and segments is shown. Na- 

 tural size. 



