(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. Berrj 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. 



III. Tetrandria. 



1. Urtica. — 6 flowers 4-sepalous. ? 



flowers 2-sepalous. Stigma penicilhite. 



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. 



