COLUMNIFERJI. 



423 



bers, but ultimately becoming leathery to woody ; in each of the 5 loculi are 

 2 (apparently only 1) rows of horizontal, oily seeds, as large as almonds, 

 Cotyledons large, thick, and irregularly folded. Endosperm absent (Fig. 442). 

 49 genera, with about 750 species ; almost entirely confined to the Tropics ; 

 none in Europe or in N. Asia. The seeds of the Cocoa- tree (T. cacao, licolor, 

 glaucum, etc., natives of Trop. Am., especially north of the Equator) are 



FIG. 410. Theobroma cacao. Branch with flowers and fruits (-J-). 



411. 



442. 



FIGS. 441-442. Theobroma cacao. 



FIG. 441. Diagram of the flower: si barren stamens. 



FIG. 442. J? Seed in transverse section : nhilum. A Embryo after the removal of one 

 of the cotyledons. 



used for chocolate and are also officinal ("Cocoa-beans," "Cocoa-butter," 

 " Oil of Theobroma"). Theobromine. Cola acuminata, Africa. 



Order 2. Tiliaceae. This differs from the other orders of the 

 Columniferas chiefly in the stamens being entirely free from each 

 other, and also divided into many filaments, as far as the 6ase, or at 

 all events very far down, so that the flower appears to have numer- 



