LESSONS IN BOTANY. 239 



The Rosacese or Rose Family is divided into several tribes, 

 each of which contains interesting plants or shrubs. The Tribe 

 Pomse includes the apple, pear, crab apple, and quince, haw- 

 thornes, etc. They have simple leaves, two to five ovaries, which 

 in the fruit are covered by the thick walls of the calyx tube. 



The Tribe Rosese includes the Roses, which exist in great va- 

 riety. They have pinnately compound leaves with entire serrate 

 leaflets. The calyx is five parted with a globose fleshy tube, 

 which incloses the pistil. The corolla consists of five petals, 

 which are greatly multiplied by cultivation, and the stamens are 

 numerous. 



The Tribe Potentillese includes the potentillas and the straw- 

 berries. They have palmate or pinnately compound leaves. 

 Many of the potentillas are cultivated as ornaments, and the dif- 

 ferent varieties of strawberry furnish a delicious fruit, which is 

 the enlarged and softened receptacle covered with the seeds or 

 akenes which are the real fruit. 



The Tribe Rubese includes the raspberries and the blackber- 

 ries. The raspberries are clusters of little stone fruits, while the 

 blackberry is a cluster of stone fruits with the receptacle on which 

 they stand. They are usually shrubs with prickly stems and 

 compound leaves. 



The Tribe Prunese includes the almond, peach, apricot, plum, 

 and cherry. They have simple, usually serrate leaves, and their 

 stems and fruit yield a gum. The inner part of the ovary 

 wall hardens into a stone inclosing the kernel or seed ; the outer 

 part forms the edible portion of the fruit. The wild cherry of the 

 United States furnishes a timber much prized for its beauty and 

 durability. No other family of dicotyledons furnishes as large 

 quantities and as great a variety of fine fruit as does the rose 

 family, and it easily leads all others in the beauty and fragrance 

 of its flowers. 



The Leguminsose or Pulse Family is made up of herbs, shrubs, 

 and trees, with alternate and usually compound leaves, and more 

 or less irregular flowers. The stamens are ten, generally mona- 

 delphous, forming a tube inclosing the pistil ; sometimes diadel- 



