DIFFERENT STRUCTURES OF THE PERICARP. 2® 



CHAP. XV. 



OF THE DIFFERENT STRUCTURES OF THE PERI- 

 CARPIUM. 



THE variations of the pericarpium itself, in respect to Num- 

 ber, arise properly from the number of its capsules ; that is, the 

 number of parts into which the fruit is externally divided, the in- 

 ternal divisions respecting the loculaments. 



In respect to external division, the pericarpium is either ab- 

 sent, as in the order Gymnospermia of the class Didynamia*;..* Uni - 

 capsular, consisting of one capsule, as in Lychnis ;.,,bicapsular, of 

 two, as in P^eonia and Asclepias ;..,tricapsular, of three, as in 

 Veratrum and Delphinium ;...quadricapsular, of four, as in Rho- 

 diola ;...quinquecapsular, of five, as in Ao.uiLEGiA;...or multi-* 

 capsular, of many, as in Caltha, Trollius, and Helleborus. 



The fruit in respect to the loculaments, or internal divisions of 

 the pericarpium, is either unilocular, of one cell, as in Trientalis 

 and Primula ^..bilocular, of two, as in Hyoscyamus, Sinapis, 

 and Nicotian a;... trilocular, of three, as in Lilium ;...quadrilo- 

 cular, of four, as in Euonymus ;...quinquelocular, of five, as in 

 Pyrola ;...sexlocular, of six, as uvAsarum and Aristolochia 

 octolocular, of eight, as in the species of Linum, called Radiola; 

 ...decemlocular, of ten, as in Linum or multilocular, of many, 

 as in Nymphjea. 



The pericarpium, in respect to the number of its valvides, or 

 outer inclosures, is either bivalve, of two valves, as in Chelidq- 

 nium and BRAssiCA;...*ra>afoe, of three, as in Viola, Polemoniom, 

 and Helianthemum ' y . . .quadrivalve, of four, as in Ludwigia and 

 Oenothera or quinquevalve, of five, as in Hottonia. 



* See Part II, Chap, XVIII, 



