MONOECIA. 365 



3. Triandria* The great genus of Carex, t. 1051, 928, 

 993 — 995, Sec, and some other grassy plants, are 

 found here. Typha, t. 1455 — 1457, is less clear in 

 its structure ; Spargamum^ t. 744, 745, 273 is suffi- 

 ciently so. Tragia^ Hernandia and Phyllanthus are 

 properly placed in this Class and Order. 



4. Tetrandria. Littorella^ t. 468 ; the valuable genera 

 Bctula, t. 1508, and Biixus, t. 1341; also the Net- 

 tle Urtica, t. 1236; are good examples of this. Mo- 

 rus 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 inclined to become even 

 dioecious in its constitution, one individual bearing 

 most fruit when occompanied by another whose barren 

 flowers are more effective than its own. Empleurum^ 

 Exot. Bot. t. 63, is one of those ambiguous genera 

 which are but imperfectly rnonpecious, 



5. Pentandria. Xanthiu7n, Ambrosia^ Nephellum^ Par- 

 thenium^ Iva and Clihadium all partake, more or less 

 accurately, of the nature of compound flowers, but 

 their anthers not being united, they could not be re- 

 ferred to the Class Syngenesia ; particularly Xanthi- 

 um and Nephelium^ whose fertile flowers have no re- 

 semblance to that Class, Amaranthiis^ an extensive 

 dunghill genus in warm countries, analogous to our 

 Chenopodhim^ follows next. Leea is the same with 

 Aquilicia, and belongs to Pentandria Monogijnia, the 

 former name being retained for the sake of the highly 

 rneritorious botanist and cultivator whom it commem- 



