DISTRIBUTION OF SPORES AND SEEDS. 283 



Fig. 246. — A fruit of Barbadoes cotton, open, exposing the voluminous hairs (commer- 

 cial cotton) which clothe the seeds. Natural size. — After Kemer. 



Fig. 247. Fig. 248. 



Fig. 247.— Fruit of Agrimonia, halved; showing torus, carrying calyx and withered 



stamens above, covered with hooks, and enclosing the hard pericarp, with a single 



seed. A pistil which did not mature lies to the right. Compare torus in fig. 175. 



Magnified about 8 diam. — After Baillon. 

 Fig. 248. — Fruit of tick trefoil {Desmodiuni Canadense). A, pods which separate into 



sections, each containing one seed. They are covered with stiff hooked hairs, some. 



of which are shown enlarged at B. A, natural size. B, magnified about 20 diam.— 



After Kerner. 



