28 ANALYTICAL KEY. 



Division III. APETALOUS : corolla (and sometimes calyx) wanting- 



A. Flowers not in catkins. 



1. Ovary or its cells containing many ovules. 



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



Six-celled: stamens 6-12 Aristolochiace^e, 403 



Four-celled: stamens 4 Ludwigia, in ONAGRACEiE, 176 



One-celled, with parietal placentae. Chrysosplenium, in Saxifragace^e, 163 

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



Two-celled, 2-beaked : flowers capitate : tree. . . Hamamelaceje, 173 

 Two-celled, many-ribbed : aquatic herb. . . PooosTEMACEiE, 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 Crassulace^e, 171 

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

 Three-celled and 3-valved. . . Mollugo, in Caryophyllacejs, 87 

 Two-celled or one-celled : placentae central. 



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

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

 Alternate with the 5 sepals. . . Glaux, in Primulace^e, 313 



Opposite the sepals when of the same number. Caryophyllace^e, 87 

 One-celled, with one parietal placenta. 



Eanunculace^e, 34 

 Ovaries 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. . . Rosace je, 146 

 Stamens inserted on the receptacle. 

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

 Leaves not dotted. 



Calyx present, and usually colored or petal-like. Ranunculace^e, 34 



Calyx absent. Flowers entirely naked, perfect, spiked. Saururace^, 42 J 



* # Pistil one, either simple or compound. 



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



2-celled: styles 2 : stamens many. . . . HAMAMELACEiE. 173 

 Ovary wholly inferior (in perfect or pistillate flowers). 

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

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



Stigma running down one side of the style. Nyssa^ in Cornace^e, 199 



Stigma terminal, with or without a style. 

 Parasitic on the branches of trees : anthers sessile. Loranthace^e, 426 

 Not parasitic above ground : anthers on filaments. Santalacejs, «i25 



