LINN&AN ARTIFICIAL SYSTEM. 143 



vessel. In all the British species, there are four naked 

 seeds at the bottom of the calyx. 



The common bugle, ground-pine, tribes of germander, savory, cat 

 mint, lavender, iron-wort, mint, and ground-ivy, archangel, dead- 

 nettle, betony, hedge-nettle, horehound, mother-wort, marjoram, 

 thyme, balin, dragon's-head, basil, skull-cap, and other families of 

 plants may be selected as examples. 



94. Angiospermia : The order angiospermia, con- 

 tains those plants, answering the character of the class, 

 which have their seeds covered, that is, lodged in a 

 proper seed-vessel. 



Here we shall meet with the eye-bright, the eock's-comb, and the 

 different genera of cow-wheat, lathraea, louse-wort, toad-flax, 



rape, monkey-flower, chaste-tree, acanthus, honey-flower, and 



others. 



CLASS XV. TETRADYNAMIA. 



95. Character .-The plants of this class, have perfect 

 flowers with six stamens, four of which are longer than 

 the other two; and it thus differs from the plants of the 

 sixth class, in which the stamens of the flowers are all of 

 equal length. The flowers of this class are also cross- 

 shaped, which is not the case with flowers of the class 

 hexandria. (F. 188.) 



Tliis is unquestionably, the most natural class of the twenty-four, 

 not only in general appearance, but also in habits and properties. 

 Linnaeus has arranged all the genera, (cleome excepted) into one 

 great natural division, by the name of siliquosee. 



96. Division : The form of the seed vessel divides the 

 plants of this class into two orders : the first called 

 silicnlosa and the second siliqiiosa. 



