ANALYTIC KEY TO THE FAMILIES IX 



Fertile flowers, only, in catkins ' Urlicacece, p. 32 



Sterile flowers, only, in catkins ; the fertile i\i a cup-like in- 

 volucre . Fftgacen, p. 31 



Both sterile and fertile flowers in catkins. 



Ovary many-ovuled .... .... Salicaceoe, pJl5 



Ovary 1-2-seeded ; cell 1-ovuled. 



Calyx regular, succulent in fruit . . . . Urticacece, p. 32 



Calyx wanting ; two or three fertile flowers in the axil of 



each scale . . . ... . Betulacece, p. 28 



BB. Flowers not in catkins. 



i;. Ovary or its cells 1— 4-ovuled. 

 D. Pistils more than one, distinct. 



Stamens on the calyx ; leaves with stipules . Rosacew, p. 60 

 Stamens on the receptacle ; petioles spreading at the base 



Banunculacece, p. 44 

 DD. Pistil one, either simple or compound. 

 B. Ovary superior. 



Stipules sheathing the stem . . . Polygonacem, p. 35 

 Stipules not sheathing the stem, 

 p. Herbs. 



Style or stigma 1 ; flowers unisexual Urticacece, p. 32 

 Style 2-3-branched ; inflorescence not a spike 



EwphorbiacecB, p. 81 

 Flowers small in dense heads or spikes accompanied 



by scarious or colored bracts Amaranthacece, p. 39 

 Flowers small ; densely clustered ; no scarious 



bracts Chenopodiaceve, p. 37 



p. Shrubs or trees. 

 Leaves opposite. 



Fruit 3-celIed Rhamnacece, p. 85 



Fruit a double samara .... Aceracece, p. 83 



Fruit a single samara Oleacece, p. 107 



Leaves alternate ; 



Styles 2 Uriicace(B, p. 32 



EB. Ovary inferior or apparently so. 



Aquatic herbs . HcUoragidacece, p. 96 



Terrestrial. 



Herbs with colored calyx. 

 Leaves opposite, simple . . . Nyciaginaceoe, p. 40 

 Leaves alternate, simple . . . commandka, p. 34 

 Shrubs. 



Leaves silvery or brownish scurvy Eleagnacece, p. 93 

 cc. Ovary or its cells many-ovuled. 

 D. Ovary superior ; cab's present. 



Ovaries 2 or more Ranunculacea, p. 44 



Ovary single, of 1 or 2 cells. 



