THE PERICARP. 129 — 
COMPOUND FRUITS. 
Formed of several carpels united into one pistil. 
1. Dehiscent. 
498. The Capsule.—This is a dry, many-celled pericarp, 
Fig. 49. of a coriaceous or membranous nature, splitting 
into several valves (480), as the Thorn Apple 
(Datura Stramonium), or dehiscing by pores 
(485), as the Snap-Dragon (Antirrhinum), and 
the Poppy; the latter of which, by the contrac- 
tion of the dissepiments, has only one cell. The 
Catchfly or Campion (Lychnis), and the rest of 
the Caryophyllex, have capsules which open at 
the top by the separation of the teeth which clos- 
edthem. (See Fig. 49, the Capsule of Lychnis). 
_ 499, Henbane (Hyoscyamus) and Pimpernel (Anagallis) 
_ have capsules which dehisce transversely. M. Richard ap- 
_ plies the term pyzidium to this kind of capsule.- 
500. The Siliqua or Pod.—This is an oblong pericarp of 
_ two valves, somewhat resembling the Legume. It has two 
_ cells, separated by a longitudinal dissepiment, parallel to the 
3 valves. This dissepiment is considered a false or spurious 
one, being formed by an expansion of the placente. The 
seeds are ranged, alternately, along each edge of the dissepi- 
ment, and on each side of it, so that there are four rows of 
_ seeds. Wallflower, Turnip, Cabbage, and many of the 
 Crucifere. (See Fig. 50.) 
Fig. 50. Fig. 51. 
