V] RUBIACE.E 49 



Again in genera like Vangueria, Plectronia, &c. we 

 find every stage of succulence of the carpels coming in 

 together with reduction of the seeds to two or even one. 



Fig. 53. Guettarda Pervilleana, transverse section of fruit (Bai). 



Two sets of cases now occur. In one the endocarp 

 remains thin, and we have baccate forms, few or many 

 seeded, and in Musscenda, &c. we see the transition from 

 capsular to baccate forms in one and the same genus. 



In another set of cases the endocarp begins to harden 

 (e.g. Isertia) and finally becomes a hard shell, and a series 

 of many-seeded or many-stoned drupaceous forms appear 

 e.g. Alberta, Pyrostria, Guettarda (Fig. 53), &c. a 

 difference being noted whether there are several bony 

 endocarps each enclosing one seed, or a single but 

 chambered bony mass with one seed in each of its 

 chambers. When, as in Salzmannia, the seed is reduced 

 to one in the bony endocarp we have a fruit indistin- 

 guishable from a Drupe, except in its origin from an 

 inferior syncarpous ovary, and by abortion of seeds. 



Finally we have several genera of Rubiacese forming 

 collective fleshy fruits (Infructescences) as in Sarco- 

 cephalus, where they are baccate, and Morinda (Fig. 54), 

 where they are drupaceous. In Ourouparia, Adina, 



w. iv. 4 



