92 



INDEHISCENT FRUITS 



be violently ejected. The Horse - Chestnut capsules are 

 succulent. The Walnut-fruit is not a nut : it is a stone-fruit, 

 the outer fleshy layer of which bursts irregularly; its so-called 

 nut is therefoi'e a "stone." 



INDEHISCENT FRUITS 



One-Seeded. 



Fig. 128. — Vertical sections of the 

 drupe of Ciierry : in the right-hand figure 

 the fruit is cut vertically through the 

 ventral suture i^s) and dorsal suture : in 

 the left-hand figure the fruit is vertically 

 cut in a plane at right angles to the pre- 

 ceding one : J^= stony layer of pericarp ; 

 ^j= testa of seed ; coi= cotyledon. 



A. DRY (Indehiscent). 



Pericarp stone-like (e.g. Hazel, fig. 138). =Nut. 

 Pericarp leathery, or hard skin-like. 



(«•) Pericarp not adhering to the testa (e.g. 

 Buttercup, fig. 115; Daisy-family, 

 figs. 127, 212). =AcIiene. 



(p) Pericarp adhering closely to the testa, 

 or the testa absent (e.g. Grains of 

 Grasses, Wheat, fig. 28). = Caryopsis. 



B. FLESHY (Indehiscent). 



(i) The inmost layer of the pericarp is stone-like = Drupe. 



(a) The outer layer of the pericarp of a drupe is like a 



thin "skin," the middle layer is usually soft 



and juicy, and the inmost layer is very hard 



