86 OBJECT LESSONS IN BOTANY. 
the pericarp is ripe, it may open in some special manner of 
itself and discharge the seeds; or it may have no prc vision 
for opening, and remain closed until it grows or decays 
Fig. 270. Achenia of Rue Anemone, in a head. 
Fig. 271. Fruit of Caraway, consisting of two achenia. 
Fig. 272, Kernel of Wheat,—a sort of achenium called cariopsis. 
Fig. 278. Fruit of Thistle,—another sort of achenium, crowned with a parrus 
which serves as wings. 7 
Fig. 274. Fruit of Elm,—a samara, or winged achenium. 
Hig. 275. 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 wtricle, 
Fig. 278. Fruit of India Strawberry,—a fleshy torus bearing the achenia outside. 
Fruits that open we will call deAzscent 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, one-seeded, dry ; 
namely, AcHENIUM, Samara, GLaNs. 
166. Of what two parts does the fruit consist? What is a dehiscent fruit? 
indehiscent ? 
