136 CHENOPODIACE^E. 



Ord. 68. ULMACRZE. Fl. mostly perfect. Perianth membran- 

 ous, 3 8-cleft. Fruit a double samara. Le. scabrous. Trees. 



For Fraxinus see Oleacece. 

 B. Barren flowers in catkins. 



Ord. 69. EL^AGNACE^E. Dioecious. Barren fl. somewhat amen- 

 taceous. Ovary enclosed in the succulent perianth tube. Le. 

 covered with scurf or scales. Shrubs. 



Ord 70. MYRICACE^E. Fl. all, amentaceous. Perianth none. 

 St. 28. Fruit surrounded by persistent scales. Le. aromatic. 

 Shrubs. 



Ord. 71. BETULACE^I. Fl. all amentaceous, monoecious. Scales 

 of the fertile catkin 2-lobed. Ovary 2-celled, each with 1 seed. 

 Trees. 



Ord. 72. SALICACE.E. Fl. all amentaceous. St. 1 or numerous. 

 Ovary 1-celled, many-seeded; seeds when ripe covered with hairs. 



Ord. 73. CUPULIFER^E. Barren fl. in catkins, or in a lax spike. 

 Fertile fl. clustered, or in loose catkins. Ovary inferior, with 2 

 or more cells. Fruit a 1-celled nut, more or less surrounded by a 

 coriaceous involucre. Trees. 



GENERA OP MONOCHLAMYDE.E. 



ORD. 60. CHENOPODIACE^;. 



1. CHENOPODIUM. Fl. perfect. Peri. 3 5-cleft. persistent, not 



altered when ripe. St. 5. Stigmas 2 3. Ovary not com- 

 bined with the perianth. Seed crustaceous, lenticular. Le. 

 flat. 



2. ATBIPLEX. Flowers imperfect, monoecious or dioecious. Barren 



fl. Peri. 3 5-partite. St. 5. Style none. Fertile fl. Peri, 

 of 2 valves, or flat bracts, enclosing the utricle. Seeds verti- 

 cally compressed. Le. flat. 



3. SALICORNIA. Flowers perfect, immersed in an excavation of 



the rachis. Peri, fleshy, obscurely lobed, flat. St. 1 2. 

 Style short. Stigma bifid. Fruit covered by the persistent 

 perianth. Stems jointed. 



4. SU^EDA. Flowers perfect. Peri. 5-partite. St. 5. Style none. 



Stigmas 3. Flowers with bracts. Le. fleshy. 



5. SALSOLA. Flowers perfect. Peri, inferior, 5-cleft, persistent, 



segments with a scarious wing at the top when ripe. St. 5. 

 Styles 2. Seeds horizontal. Le. fleshy with prickly points. 



