ALLIANCES OF PLANTS. 



223 



Stems solid. Carpels single 

 Carpels 



GROUP VI. GLUMOS^E. 



Stems fistular . . . 264. Graminaceae . Fruit floury (Corn). 



Herbage sweet 

 (Sugar-cane, 

 Grass, &c.) 

 Diaphoretic. Un- 

 important. 

 Flowers naked. 



several. 

 Flowers with a calyx. Seeds 



few. 



Flowers with a corolla. 

 Seeds numerous. 

 United to Spadicosae by- Cyperaceae, and to Hypogynosae by Restiaceae. 



The relation of Endogens with other parts of the system seems to be, 

 With Gymnospermas through Palmaceae to Cycadacese. 



With Exogens Alismaceae 



Hydrocharaceae 



Retosae 



Araceae 



With Rhizanthae through Araceae 

 With Acrogens Pistiaceae ? 



265. Cyperaceae 



266. Desvauxiacese. 



267. Restiacese. 



268. Xyridaceae. 



Ranunculaceae. 



Nymphaeaceae. 



Menispermaceas. 



Aristolochiaceae. 



Cynomoriaceae. 



Marsileaceae ? 



Sepals several, 

 parietal. 



Sepals four. Placentae pa- 

 rietal. 



Placentas central . . 



CLASS IV. RHIZANTH^E. 

 Placentae 269. Rafflesiaceae 



270. Cytinaceae 



271. Cynomoriaceae 



Astringent. 

 Astringent. 



Astringent (F^m- 

 gus melitensis). 



These singular fungoid plants are neither Exogens nor Endogens, because they have no 

 vascular system, and their sexual apparatus is imperfect ; they are not Acrogens, because 

 they have flowers and sexes. They are connected 



With Endogens through Araceae. 



With Acrogens Fungaceae. 



CLASS V. ACROGEN^E. 



Alliance 1. Filicales. Stems fistular, vascular. Reproduc- 

 tive organs borne upon the leaves. 



Ring of the thecae vertical . 272. Polypodiaceae . v 



Ring of the thecae transverse 273. Gleicheniaceae . 



Ring wanting. Thecae one- 274. Osmundaceae 



celled, ribbed. 



Ring wanting. Thecae as 275. Danaeaceae 



if many-celled. 



Ring wanting. Thecae one- 276. Ophioglossaceae 



celled, veinless. 



Thecae in cones . . 277. Equisetaceae 



Astringent. Pecto- 

 ral. Some eatable. 



Epidermis siliceous. 



