296 ANGIOSPERMS. 



MONOCOTYLEDONS. 



PETALOIDE^E: Conspicuous petals (or perianth) are the charac 

 teristic feature. 



Alismacece ; water-plaintain family, alisma, etc. 



Liliacece ; lily family, trillium, lily, etc. 



Cannacece ; canna family. 



Orchidacece ; orchid family. 

 SPADICIFLOR^ : The spadix and spathe are characteristic. 



Aracece ; arum family, skunk's cabbage, jack-in-the-pulpit, etc. 



Lemnacece ; duckweed family, lemna, wolffia, etc. 



Palmacece ; palm family. 



GLUMIFLORAE : The subtending bract (glume) at the base of 

 the flower is characteristic. 



Graminece ; grass family. 



Cyperacece ; sedge family. 



560. Table of families of dicotyledons studied (a few other 

 families are introduced in the scheme). In the dicotyledons 

 there are two cotyledons on the embryo ; the venation of 

 the leaves is reticulate; the endosperm is usually absent, and 

 the parts of the flower are frequently in fives. There are 

 exceptions to all the above characters, and the sum of the 

 characters must be considered, just as in the monocotyledons. 



DICOTYLEDONS. 

 I. CHORIPETAIJE ; the petals are distinct. 



*. Amentiferce, ament- or catkin-bearing plants. 

 SALICIFLOR^ : Both kinds of flowers in catkins. 



Salicacece ; willow family, poplars and willows. 

 QUERCIFLOR/E : Pistillate flowers in acorns or cones. 



Betulacece ; birch family, birch, alder, etc. 



Corylacecz ; hazelnut family, hazelnut, hornbeam, etc. 



Cupuliferce ; oak family, oak, chestnut, beech. 

 JUGLANDIFLOR^E : Pistillate flowers form nuts in fruit. 



Juglandacece ; walnut family. 



**. Choripetalce proper, flower not degenerate. 



