474 MONOECIA, 



3. Triandria. The great genus of Car ex, 

 t. 1051, 928, 99S—995, &c., and some 

 other grassy plants, are found here. Ti/pha, 

 f. 1455 — 1457, is less clear in its struc- 

 ture ; Sparganimn, t. 744, 745, 273, is 

 sufficiently so. Tragia^ Hernandia and 

 Thyllanthus are properly placed in this 

 Class and Order, 



4, Tetrandria, iz7/ore//rt, ^.468; the valua- 

 ble genera Bctuia, f. 1508, and Bilxus^ 

 t. 1341; also the Nettle Urtica^t. 1236; 

 are good examples of this. Morus the 

 Mulberry, of the same natural order as 

 the Nettle, has scarcely any difference of 

 structure in the accessory organs of the 

 flowers. This tree however is remarkable 

 for being often inchned to become even 

 dioecious in its constitution, one individual 

 bearing most fruit when accompanied by 

 another whose barren flowers are more ef- 

 fective than its own. Emplturum^ Exot. 

 Bot. t. 63, is one of those ambi^ruous g-e- 

 nera which are but imperfectly monoe* 

 pious, 



