LINN^AN ARTIFICIAL SYSTEM. 125 



15 Monogynia: Consisting of those plants of the 

 class, which produce flowers with but one pistil. 



This order contains many plants, among which are the beautiful 

 crocus, the iris, the corn-flag, the valerian, &c. Here also, we find 

 the sword-leaved plants and numerous grass-like plants, as the cy- 

 prus-grass, the cotton-grass, the bull-rush, the bog-rush, &c. 



16. Digynia: Including such plants of the class, as 

 produce flowers with two pistils. 



The verdant carpet which covers the earth, is principally com- 

 posed of plants belonging to this order, and though the least striking, 

 are by far the most valuable of all vegetable productions. Here 

 are the sugar-canes, and with a few exceptions, the true grasses, so 

 many of which, as wheat, barley, rye, oats, &c. are of infinite 

 service to man. (F. 176.) 



17. Trigynia: Comprehending such plants of the 

 class, as produce flowers with three pistils. 



This order is chiefly composed of little pink-like plants, most of 

 which are arranged in the natural order caryophyllece. The four- 

 leaved polycarpon, blinks, jointed pipe-wort, and umbelled holos- 

 teum, are the only indigenous productions belonging to this order. 



CLASS IV. TETRANDRIA. 



18. Character: In this class, the flowers are fur- 

 nished with four stamens, all of an equal length ; in 

 which respect, they differ from plants of the class 

 didynamia. (F. 177.) 



The class tetrandria has some claims to the character of a natural 

 class. Several of the genera, such as protea, banksia, globularia, 

 button- wood, teasel, scabious, &c. form a part of the Linnaean natu- 

 ral order aggregate. The ixora, hedyotis, houstonia, madder, ladies- 

 bed-straw, woodroof, &c. form a part of the Linntean natural order 

 stfllatcc. All these genera, together with many others which 

 M 2 



