(73) 



4. Phoradendron. Flowers immersed in the 



racliis of articulate spikes. Perigonium 

 3-lobed. Ovary inferior. Fruit a berry. 

 Parasitic. 



5. Megarrhiza. Flowers complete. $ flow- 

 ers in racemes, ? flower solitary in the 

 axilla of the c$ raceme. 



IV, Tetrandria, 



A. Flowers complete. 



1. Ptelea. Calyx 4-parted. Petals 4. Stam- 

 ens alternate with the petals. Fruit a 

 2-seeded samara. Shrub. Tree. 



B. Flowers perigoniate in $ and ? . 



1. Urtica. ? perigonium 2-sepalous. 



2. Hesperocnide. ? perigonium gamosepa- 



lous. 



C. Perigonium 0, or only present in one sex. 



1. Cupressus. $ flowers : anthers attached 

 to a peltate bract. Cone globose". Seeds 

 angulate, narrowly winged. Leaves op- 

 posite. Coniferous. 



2. Libocedrus. $ flowers : anthers attached 



to a peltate bract. Cone oblong. Wings 

 of the seed unequal. Leaves opposite. 

 Coniferous. 



