(77) 



II. Triandria. 



1. Salix. Amentaceous. Perigonium 0. 

 Shrub. Tree. 



2. Phoradendron. Flowers immersed in 



the rachis of an articulate spike. 

 Perigonium 3-lobed. Anthers 2-celled 

 dehiscent by 2 pores. Berry globose, 

 1-seeded. 



3. Arceuthobium. $ perigonium 3-lobed. 



? 2-dentate. Anthers 1-celled, dehis- 

 cent by a slit. Berry compressed, 1- 

 seeded. 



4. Atriplex. $ perigonium 3-sepalous. 



$ 2-parted. Fruit a utricle. 



5. Amarantus. Perigonium 3-parted. 

 Fruit a capsule with circumscissile de- 

 hiscence. 



6. Brizopyrum (Distichlis). Glumaceous. 

 Inferior glume co-nerved. 



7. Poa. Glumaceous. Inferior glume 1- 

 nerved. 



Ill, Tetrandria. 



1. Urtica. 6 flowers 4-sepalous. 9 

 flowers 2-sepalous. Stigma penicillate. 



2. Negundo. Perigonium depauperate, 4- 

 cleft. Ovary 2-lobed, 2-celled. Fruit 

 a 2-seeded samara. Tree. 



3. Ptelea. Calyx 4-5 sepalous. Petals 4. 

 Fruit a 2-seeded samara. Tree. 



