344 MONCECIA. [CL. XXI. 



10. U'RTTCA. 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, 



superior, polished. 



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

 Rudiment of a germen. 

 Fertile flower '. Calyx four-leaved. Petals three. Styles three. 



Capsule three-celled. Seeds two. 



8. A'LNTJS. Barren flower. Calyx the scale of a catkin, per- 

 manent, three-flowered. Corolla deeply four-cleft. 

 Fertile flower. Calyx the scale of a catkin, permanent, two- 

 flowered. Corolla none. Style two. Nut compressed, with- 

 out wings. 



(Myrica.) 



Order V. PENTANDRIA. Five Stamens. 



12. XA'NTHIUM. Barren flower. Common calyx imbricated, 



many-flowered, with intermediate scales. Corolla of one 

 petal, funnel-shaped, five-cleft. 



Fertile flower. Calyx of two leaves, with two flowers. Co- 

 rolla none. Drupe coated with the prickly calyx. Nut two- 

 celled. 



13. AMARA'NTHUS. 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. 



Fertile flowers. Calyx four-leaved. Petals four. Stigmas four, 

 sessile. 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. Nut two-celled. 



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



three. Stamens about twenty-four. 



Fertile flowers. Calyx three-leaved. Petals three. Pistils 

 numerous. Seeds numerous, bordered. 



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



Corolla none. Stamens from sixteen to twenty. 

 Fertile flowers. 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 segments, 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. 



