154 REPRODUCTIVE ORGANS. CHAP. III. 



Simple, Sometimes the several valves, when united, form 

 one cay ity ? as m Anagallis ; and sometimes 



one cavi- ^ e y form several cavities, as in the Iris. In the 



ty ; or 



former case the pericarp is said to be simple ; in 

 the latter, it is said to be compound. 



Com- The compound pericarp is divided into internal 



andV- cavities by means of a number of thin and mem- 

 branaceous substances, called partitions, intersect- 

 ing the interior of the fruit, and attached some- 

 times to the axis, and sometimes to the valves. In 

 the former case they are said to be central ; in the 

 latter parietal. But sometimes also they are at- 

 tached both to the axis and the valves, and then 

 they are said to be copulative. If they form an 

 enclosed cavity they are said to be complete, as in 

 Oxalis ; but if they do not form an enclosed 

 cavity they are said to be incomplete, as in the 

 Poppy. Sometimes they are attached longitudi- 

 nally to the middle of the valves, in which case 

 they are said to be ventral ; and sometimes they 

 are formed of the inflections of the edges of the 

 valves, in which case they are said to be marginal, 

 and are always double.* Sometimes they are 

 placed opposite to the valves, as in Epilobium ; and 

 sometimes perpendicular to them, as in Hedysarum. 

 They are also described as being vertical or hori- 

 zontal, parallel or contrary, with a reference to the 

 position of the valves. 



* Gaert. De Sem. Jntrod. 



