KEY TO THE FAMILIES ix. 



Styles 2-3; achene 3-sided 



Polygonacese 15 



Leaves opposite. 



Stems swollen at nodes; at least 

 some of the flowers terminal. 

 Flowers several in a cluster, sur- 

 rounded by the calyx-like 

 involucre . Nyctaginacese 19 

 Flowers solitary or cy- 

 mose; not surrounded 

 by a calyx-like in- 

 volucre . Caryophyllacese 19 

 Stems not swollen at the nodes; 



flowers all axillary 



Glaux in Primulaeese 70 



Corolla and calyx both present. 



Corolla of separate petals (apopetalous). 

 Stamens more than 10. 

 Shrubs or trees. 



Leaves alternate or fascicled Rosacese 41 



Leaves opposite. 



Trees or tall shrubs Aceracese 55 



Low woody vines 



Clematis in Rammculaceee 20 



Herbs. 



Pistil 1, of united carpels. 



Filaments united into a tube. Malvaceae 57 

 Filaments distinct. 



Leaves entire, smooth and suc- 

 culent Portnlacacese 22 



Leaves entire to sinuate- 

 toothed, covered with barbed 



hairs Loasaceae 61 



Leaves spiny-toothed. Papaveracea? 27 

 Leaves reduced to spines or 

 wanting; very fleshy 



plants Cactacese 61 



Pistils several, of distinct carpels. 



Stamens on receptacle. . Rammculacea? 23 



Stamens on the calyx Rosaoere 41 



Stamens not more than 10. 

 Shrubs or trees. 



Leaves alternate. 



Leaves compound. 



Styles 3; fruit a small 



drupe Anaeardlacea? 54 



Style 1, not cleft; fruit a 



legume Legmninosse 46 



Style none; fruit a ber- 

 ry Berber I daceee 27 



