138 CUPULIFER^E. 



2. PARIETARIA. Fl. polygamous. Peri, bell-shaped, 4-partite, 



surrounded by an involucre. St. 4. Style filiform. 



3. HUMULUS. Dioecious. Barren fl. Peri. 5-partite. St. 5. 



Fertile fl. in a catkin. Peri, or scales concave. Stigmas 2. 

 sessile, filiform. Twining plants. 



ORD. 68. ULMACE.E. 



1. ULMUS. Peri, campanulate, 4 5-cleft, persistent. St. 5. 

 Styles 2. Seed winged all round (a samara). Trees. 



ORD. 69. ELJSAGNACE.E. 



1. HIPPOPHAE. Dioecious. Barren fl. in a sort of catkin, scales 

 1-flowered. Peri. 2-partite. St. 4. Fertile fl. solitary. Peri. 

 tubular. Style short. Stigma long. Seed enclosed by the 

 fleshy perianth. Shrubs. 



ORD. 70. MYRICACE^. 



1. MYHICA. Dioecious. Flowers in catkins. Barren fl. Scales 

 concave. St. 4 8. Fertile fl. Styles 2. Berry superior, 

 1 -seeded. Shrubs. 



ORD. 71. BETULACE^. 



1. BETULA. Monoecious. Barren fl. in catkins. Peri. none. St. 



10 12. Fertile fl. with 3-lobed, 3-flowered scales, deciduous. 

 Fruit winged. Trees. 



2. ALNUS. Monoecious. Barren fl. in catkins. Scale 3-lobed, 



3-flowered. Peri. 4-partite. St. 4. Scales of the fertile 

 catkin 2-fl., coriaceous, persistent. Styles 2. Fruit com- 

 pressed, without wings. Trees. 



ORD. 72. SALICACE^E. 



1. SALIX. Dioecious. Flowers in catkins. Barren fl. Scales 



entire. St. 15. Fertile fl. with a free 1-celled ovary, 1 2 

 glands at its base. Seeds hairy. Trees or shrubs. 



2. POPULUS. Dioecious. Barren fl. in catkins. Scales lacerated. 



St. 430. Fertile fl. with a cup-shaped peri. Stigmas 48. 

 Trees. 



ORD. 73. CUPULIFER.E. 



1. FAGUS. Monoecious. Fl. in catkins. Barren catkin globose. 

 Peri. 5 6-cleft. St. 815. Fertile fl. 2, in a 4-lobed prickly 

 involucre. Stigmas 3. Nuts 1 2, enclosed in the hardened 

 involucre. Trees. 



