214 



THE REPRODUCTIVE ORGANS 



receptacle is hollowed and bears the achenes on the inner 

 surface of the cup. Both in this and in the Strawberry 

 the fleshy part is the receptacle, and these fruits are there- 

 fore succulent fruits containing many dry indehiscent 

 nutlets. 



Fruits like those of the Dandelion (Fig. 147), Coltsfoot, 

 Thistles, &c, are achenes ; but they are formed from an 

 inferior ovary of two carpels, only one of which matures, 

 and that contains but one seed. 



ov 



Fig. 148. 1, Cremocarp of Hogweed ; 2, mericarps separated; 

 c, carpophore ; m, mericarp ; ov, ovary ; st, stigmas. 



The fruits of Grasses like Wheat, Maize, and Oat differ, 

 as we have seen, in that the fruit-coat and seed-coat closely 

 adhere. 



The Sycamore key (Fig. 202, 5) consists of two or more 

 carpels, which, when ripe, separate into part-fruits (meri- 

 carps) but do not scatter the seeds. Each part contains 

 one seed, and is provided with a wing. Cut open a fruit ; 

 observe the thick fruit-coat lined with a felt of hairs and the 

 seed within covered by a thin brown testa. Remove this 

 and examine the embryo carefully ; see how the cotyledons 

 are rolled up. Make a paper model to show clearly how 

 they are folded and rolled (Fig. 202, 6). Such winged fruits 



