86 



OBJECT LESSONS IN BOTANY. 



tlie pericarp is ripe, it may open in some special manner of 

 itself and discharge tlie seeds ; or it may have no prc\^ision 

 for opening, and remain closed until it grows or decays 



Fig. 270. Achenia of Kue Anemone, in a head. 



Fig. 'ill. Fruit of Carawa}', consisting of two achenia. 



Fig. 272. Kernel of Wheat, — a sort of acheiiinm called cariopsis. 



Fig. 273. Fruit of Thistle, — another sort of achenium, crowned with a pappus 

 which serves as wings. 



Fig. 274. Fruit of Elm, — a samara, or winged achenium. 



lig. 21b. Fruit of Beech, — two nuts, inclosed in the burr. 



Fig. 276. The Peach (a drupe),— cut open, showing the seed inclosed in its stone, 

 and the stone in the thick pulp. 



Fig. 277. Fruit of Pigweed, — a one-seeded pericarp called ntricle. 



Fig. 278. Fruit of India Strawberry,— a fleshy torus bearing the achenia outside. 



Fruits that open we will call dehiscent fruits, and those 

 which do not open, indehiscent. We will first study some of 

 the forms of indehiscent fruits, arranged as follows : 



167. First Division : Fruits indehiscent, 

 namely, Achenium, Samaka, Glans. 



one-seeded, dry 



166. Of what two parts does the fruit consist ? What is a deliiscent fruit t 

 indeliiscent ? 



