344 MONffiCIA. [CL. XXI. 



10. U'RTICA. Barren flower. Calyx four-leaved. Corolla none. 



Nectary central, cup-shaped. Stamens as long as the calyx. 

 Fertile flower. Calyx two-leaved. Corolla none. Seed one, supe- 

 rior, polished. 



9. BU'XUS. Barren flower. Calyx three-leaved. Petals two. Ru- 

 diment of a germen. 

 Fertile flower. Calyy four-leaved. Petals three. Styles three. 



Capsule three-celled. Seeds two. 

 8. A'LNUS. Barren flower. Calyx the scale of a catkin, permanent, 



three-flowered. Corolla deeply four-cleft. 



Fertile flower. Calyithe scale of a catkin, permanent, two-flowered. 

 Corolla none. Style two. Nut compressed, without wings. 

 (Myrica.) 



Order V. PENTANDRIA. Five Stamens. 



12. XA'NTHIUM. Barren flower. Common ralyx imbricated, many- 



flowered, with intermediate scales. Corolla of one petal, funnel- 

 shaped, five-cleft. 



Fertile flower. Calyx of two leaves, with two flowers. Corolla none. 

 Drupe coated with the prickly calyx. Nut two-celled. 



13. AMARA'NIHUS. Barren flower. Calyx of three or five leaves. 



Corolla none. Stamens three or five. 



Fertile flower. Calyx of three or five leaves. Corolla none. Styles 



three or two. Capsule one-celled. Seed one. 



14. BRYO'NIA. Barren flower. Calyx five-toothed. Corolla five- 



cleft. Filaments three. Anthers five. 



Fertile flower. Calyx five-toothed, deciduous. Corolla five-cleft. 

 Style three-cleft. Berry inferior. Seeds few. 

 (Fagus. Quercus. Atriplex.) 



Order VI. POLYANDRIA. More than Five Stamens. 



16. MYRIOPHY'LLUM. Barren flowers. Calyx four-leaved. Petals 



four. Stamens eight. 



FertUeflnwers. Calyx four-leaved. Petals four. Stigmas four, ses- 

 sile. Drupes four. 



19. POTE'RIUM. Barren flowers. Calyx three-leaved. Corolla 

 deeply four-cleft. Stamens from thirty to fifty. 



Fertile flowers. Calyx three-leaved. Corolla deeply four-cleft. 

 Pistils two. A T t two-celled. 



17. SAGITTA'RIA. Barren flowers. Calyx three-leaved. Petals 



three. Stamens about twenty-four. 



Fertile flowers. Calyx three-leaved. Petals three. Piit Us nume- 

 rous. Seeds numerous, bordered. 



15. CERATOPHY'LLUM. Barren flowers. Calyx many-cleft. 



Carotin none. Stamens from sixteen to twenty. 



Fertile flowtrs. Calyx many-cleft. Corolla none. Stigma sessile, 

 oblique. Drupe compressed. 



21. FA'GUS. Barren flowers in a catkin. Calyx with several segments. 

 Corolla none. Stamens from five to twenty. 



Fertile flowers. Calyx double ; the outer inferior, prickly, deeply 

 divided into several segment*, two or three-flowered ; the inner 

 superior, five or six-cleft. Corolla none. Styles five or six. Nuts 

 two or three, invested by the enlarged outer calyx. 



