28 AJ^ALTTICAL KEY. 



Division m. APETALOUS : corolla (and sometimes calyx) wanting. 



A. Flowers not in catkitis, 



1, Ovary or its cells containivg many ovules. 



Ovary and pod inferior (i. e. calyx-tube adherent to the ovary). 



Six-celled : stamens 6-12 Aeistolochiace^, 403 



Four-celled: stamens 4 Ludwigia, in Onagrace^, 176 



One-celled, with parietal placent£e. Chrysosplenium, in SAXiFEAGACEiE, 163 

 Ovary and pod wholly naked (there being no calyx), 



Two-celled, 2-beaked : flowers capitate.; tree. . . Hamamelace^, 173 

 Two-celled, many-ribbed : aquatic herb. . . Podostemace^, 429 



Ovary and pod superior, i. e. free from the calyx. 

 Five-celled and 5-beaked, opening across the beaks, which 



fall off at maturity : stamens 10. Penthorum, in Crassdlace^, 171 

 Three -5-celled, opening round the middle. Sesuvium, in PoRTnLACACE^, 97 

 Three-celled and 3-valved. . . MoUugo, in Cakyophyllaoe^, 87 

 Two-celled or one-celled : placentae central. 



Stamens inserted on the throat or tube of the calyx. Ltthkace.e, 182 

 Stamens inserted on the receptacle or the base of the calyx, 

 Alternate with the 5 sepals. . . Glaux, in PKiMULACEiE, 313 



Opposite the sepals when of the same number. CAKYOPHYLLACEiE, 87 

 One-celled, with one parietal placenta. ) ^ 



^.„ ..-1 t • ■ ■ KANnNCTTLAOE^, 34 



Ovanes 2 or more, separate, simple. ) 



2. Ovary or its cells containing only 1 or 2, rarely 3 or 4, ovules. 



* Pistils more than one, and distinct or nearly so. 



Stamens inserted on the calyx. Leaves with stipules. . . RoaACE.s:, 146 

 Stamens inserted on the receptacle. 

 Leaves punctate with pellucid dots. . Zanthoxylum, in Rutace.^;, 109 

 Leaves not dotted. 



Calyx present, and usually colored orpetal-like. RANiiNCULAOEiE, 34 



Calyx absent. Flowers entirely naked, perfect, spiked. Saururace^, 427 



# # Pistil one, either simple or compound. 



Ovary partly inferior, the calyx coherent to its lower half, 



2-celled : styles 2 : stamens many. . . . HAMAMELACB.iE, 173 

 Ovary wholly inferior (in perfect or pistillate flowers). 

 Aquatic herbs : ovary 3-4 celled, or (Hippuris) 1-celled. Halorage.^, 174 

 Woody plants : style or stigma one, entire : ovary 1-celled. 



Stigma running down one side of the style. Nyssa, in CoRNACEiE, 199 

 Stigma terminal, with or without a style. 

 Parasitic on the branches of trees : anthers sessile. LoRAifTHACE.s:, 426 

 Not parasitic above ground : anthers on filaments. SANTALACEa;, 425 



