THE NATUBAL SYSTJiM. 267 



classes: 1, Petaloidece; and 2, Glwmacece ; grass and 

 corn having chaffy bracts instead of petals. The 

 leaves are in parallel veins with the exception of the 

 black bryony family, Dioscoreacees ; the Paris family, 

 TrilliaceaB. By some botanists these form a supposed 

 connecting link between Exogence and Endogencs, but 

 they are generally included with the latter. The 

 remaining sixteen families of the Petaloidece are 



1. The Frogbit family .... Hydroclharidaceoe. 



2. The Orchis family .... OrchidaceoB. 



3. The Iris and Crocus family . Iridacece. 



4. The Daffodil and Snowdrop fam. Amaryllidacea. 



5. The Lily family Liliacece. 



6. The Meadow-saffron family . Melanihaceae. 



7. The Water-plantain family . Alismacece. 



8. The Flowering Eush family . Butomacea. 



The following have inconspicuous flowers. The 

 first three have flowers on a spadix or thick fleshy 

 spike ; the remainder without. 



9. The Eeedmace family .... Typliaceae. 



10. The Arum family Aracece. 



11. The Sweet Sedge family . . . Orontiacece. 



12. The Eush family Juncaceoe. 



13. The Arrowgrass family . . . Juncagenac&t 



14. The Pipewort family .... Restiacece 



15. The Duckweed family .... Naiadacece. 



16. The Pondweed family .... Pistiaceae. 



