KEY TO THE FAMILIES. 53; 



I- A OK 



Seeds minute and very numerous, without albumen Orchid 72 

 Cotyledons two. Stem separated into bark, wood and pith. Leaves 

 mostly netted-veined. 



Petals none. Calyx either present or wanting 

 Flowers in aments. Trees or shrubs 

 Only the sterile flowers in aments 



Leaves simple lkc( h 119 



Leaves pinnate Walnut 99 



Fertile flowers in aments 



Aments globose Plane-Tree, Mulberry and Witch-hazel 



143- 227. 232 

 Aments oblong or linear 

 Calyx none 



Fruit one-seeded Bayberry and Corkwood 105, 109 



Fruit many-seeded . . . Willow 109 



Calyx present Mo?'us in Mulberry and Birch i 15, 143 

 Flowers not in aments. Tree, shrubs and herbs 

 Calyx none 



Marsh herbs Lizard 's-tail 97 



Tree .... Sweet gum in Witch-hazel 230 



Plants of drier grounds .... Spurge 299 



Calyx present, sometimes corolla-like 

 Ovaries more than one 



Leaves stipulate . , . Neviusia in Rose 241 



Stipules none . . . Ranunculus in Crowfoot 183 

 Ovary one and superior or free from the calyx. Seed solitary 

 Trees and shrubs 

 . Leaves stipulate . . Elm and Mulberry 139. 143 



Stipules none Laurel 191 



Herbs and vines 



Fruit an achene .... Buckwheat 152 



Fruit a capsule Pink 158 



Ovary one and superior or free from the calyx. Seeds 

 numerous 



Leaves whorled Crowbcrry 304 



Leaves alternate I^'^x 304 



Leaves opposite 



Fruit a single samara .... Olive 419 



Fruit a double samara .... Maple 32a 



Fruit a drupe . . Olive and Buckthorn 4»9- 3-^ 



