246 EXPLANATION OF THE 



the fruit serve us in Rosa, Rubus, Dryas and Geum 

 to discriminate those, whose leaves, flowers and hab- 

 it all stamp them as distinct ! A student cannot do 

 better than to study this oider and these genera as 

 an introduction to the knowledge of more obscure 

 ones ; and the beautiful plants which compose it, 

 mostly familiar to everybody, are easily obtained. 

 Polyandria has three orders. In the first we find the 

 Poppy, Bloodroot, Lime tree, Cistus and Nym- 

 phwa. The second, (Di-pentagynia) has Larkspur, 

 Monk's hood, Columbine and Fennel flower ; and 

 the third, (polygynia) has Magnolia, Tulip tree, 

 Anemone, Clematis and Ranunculus, most of which are 

 cultivated as ornamental plants. 

 Didynamia has two orders. Gymnospermia, having four 

 naked seeds; includes the Mints, Lavender, Marjoram 

 and Basil ; andAngiospermia, having its seeds in a 

 capsule, is exemplified in Gerardia, Bartsia and 

 Trumpet-flower, all American plants. 

 Tetrad ynamia. — The first order of this class having its 

 fruit a silicle, is exemplified in Draba, Thlaspi or 

 Shepherd's Purse, Honesty and Candy-tuft ; and the 

 second, having its seeds in a silique, embraces the 

 Cabbage, Mustard, Radish and Wall-fiower, all of 

 which are familiar examples. 



The class Monodelphia has eight orders. In Trian- 

 dria we find Sisyrinchium and the T^-ger flower : Pen- 

 tandria is illustrated by the Musk Geranium, Erodi- 

 um ; Heptandria by the Cape Geraniums, Pelargonium ; 

 Decandria by Acacia, and Crane's-bill ; and Polyan- 

 dria which is a very splendid order embraces the Mal- 

 vaceae of Jussieu. 



The cla*s Diadelphia has four orders. Pentan- 

 dria is illustrated by Petalostemon, Hexandria by 



