256 MONCECIA. 



2. CALLITRICHE. Barren FL Perianth single, of 2 leaves. An~ 

 ttier of 1 cell. 



Fertile FL Gerraew4-lobed. Styles 2. Pericarp of 4 deep, 

 com pressed lobes, indehiscent, 4-celled; cells 1-seeded. 



3. ZOSTKKA. Stamens and pisti s inserted in 2 rows upon out- 

 side of a vpadix. Spatha foliaceous. 



Barren FL Anthers ovate, sessile, alternating with the ge: - 

 mens. 



Fertile FL Gerwe?/? ovate. Style bifid. Drupe with I seed. 



(Chara, CRYPTOGAMIA.) 



2. TRIANDRIA. 



5. SPAUGANIUM. Flowers in sphaerical dense headb. 



Barren FL Perianth single, of 3 leaves. 

 Fertile FL Perianth single, of 3 leaves. Drupe dry, with 

 1 seed. 



6. CAREX. Flowers collected into an imbricated catkin. 



Barren FL Calyx of I scale, glumaceous. Cor. 0. 



Fertile FL Calyx of 1 scale, glumaceous. Cor. of 1 leaf, 

 urceolate, ventricose. Stigmas 2 3. Nut triquetrous, inclu- 

 ded within the persistent cor. 



4. TYPHA. Flowers collected into cylindrical dense spikes or 

 catkins. 



Barren FL Perianth 0. Stam. 3 together, upon a chaffy 

 or hairy receptacle, united below into 1 filament. 



Fertile FL Perianth 0. Pericarp pedicellate, surrounded at 

 the base with hairs resembling a pappus. 



3. TETRANDRIA. 



7. ERIOCAULON. Flowers collected into a compact, scaly head. 



Barren FL in the disk. Perianth single, 4-cleft, the 2 in- 

 ner segments united nearly to their summit. Stam. 4 6. 



Fertile FL in the circumference. Perianth single, deeply 

 4-partite. Style 1. Stigmas 2 3. Capsule 2 3-lobed, 

 2 3-celled. Cells i -seeded. 



8. LITTORELLA. Barren FL Calyx of 4 leaves. Cor. 4-fid. 

 Stam. very long. 



Fertile FL Calyx 0. Cor. unequally 3-cleft. Style very 

 long. Nut 1-seeded. 



10. URTICA. Barren FL Perianth single, of 4 leaves, contain- 

 ing the cup-shaped rudiment of a gcrmen. 



Fertile FL Perianth single, of 2 leaves. Pericarp 1 -seeded, 

 shining. 



9. ALNUS. Flowers collected into imbricated catkins. 



Barren FL Scale of the catkin 3-lobed, with 3 flowers. 

 Perianth single, 4-partite. 



