520 



DICOTYLEDONES. 



and hence the leaves are borne in pairs; the flower placed between the two 

 leaves of a pair is therefore the terminal flower of the shoot to which tbe 

 smaller of the two leaves belongs, and the larger leaf is the subtending leaf for 

 the floral shoot itself. 



n 



IT 



FIG. 556. Diagrammalic representation of the branching in Solanacese. The various 

 shoot-generations are white or shaded. 



A. FRUIT A CAPSULE. Nicotiana (Tobacco) has a 2-valved 

 capsule with septifragal dehiscence ; the valves separate at the 

 apex ; the corolla is funnel-shaped, tubular, salver-shaped or 

 campanulate. The flowers in panicles. Datura (I), stramonium, 

 Thorn-apple) has a (frequently spiny) capsule (Fig. 558), which is 



FIG. 557. Fruit of Hyotcyamus niger after 

 removal of calyx. 



FIG. 558. Fruit of Datura stramonium. 



falsely 4-locular (at the top, bilocular) and opens septifragally with 

 4 valves. The lower part of the calyx persists as a thick collar 



