ARTIFICIAL KEY TO THE FAMILIES. li 



Scapigerous herbs with united petals ; leaves 



radical ; flowers in simple, elongate spikes, 



often dimorphic CXVI. PLANTAGINACEAE. 



Corolla-lobes 5, rarely 6-7 ; or if 4, then the 



1-2 cells of the ovary many-ovuled : 



Carpels free ; styles united ; or if carpels 

 also united, then corolla-lobes contorted 

 and twisted clockwise ; corolla-lobes and 

 stamens always 5 ; anthers usually 

 connate ; herbs, shrubs, often climbing, 

 and trees usually with milky sap : 



Pollen granular; stigma annular or 

 interrupted below the smooth, non-stig- 

 matic, entire or 2-fid tip of the style ; fruit 

 berry-like, drupaceous or of 2 free, rarely 

 cohering follicles XCIX. APOCYNACEAE. 

 Pollen waxy or granular, aggregated in 

 solitary or paired masses in each cell of 

 the free or connate anthers ; filaments 

 usually connate ; apex of the style 

 flattened into a plane or beaked disk 

 with stigmatic border, bearing 5 glands 

 to which the pollinia are attached in 

 pairs or fours ; fruit of 2, rarely 1, free 



follicles C. ASCLEPIADACEAE. 



Carpels and styles always united ; stigma 

 terminal ; corolla-lobes imbricate or val- 

 vate ; or if contorted, then twisted anti- 

 clockwise ; corolla-lobes and stamens 4-5. 

 or occasionally many : 



Stipules present or represented by a 

 raised line joining the bases or petioles 

 of opposite leaves ; corolla-lobes valvate 

 or imbricate ; or if contorted, then 

 corolla long-tubular and placentas 2-fid ; 



ovary 2-celled CI. LOGANIACEAE. 



Stipules 0, not represented by a raised 

 line ; corolla-lobes contorted ; or if 

 valvate, then leaves alternate ; ovary 

 1 -celled; or if 2-celled, then corolla 

 short, rotate and placentas undivided 



CIL GENTIANACEAE. 



