KEY TO THE FAMILIES 



37b. Gynoecium consisting of a compound ovary, the 

 carpels united or separating at maturity. 

 43a. Stamens free. (For 43b see p. 15.) 

 44a. Carpels splitting apart at maturity. 

 45a. Fr. consisting of nutlets. 



Nutlets bearing the persistent styles at 



maturity 82. Geraniaceae 



Nutlets bearing stiff spines at maturity: 



lvs. opposite 86. Zyyophyllaceae 



45b. Fr. consisting of samaras. 



Carpels 5-6, united or free below: fr. con- 

 sisting of 1-6 free samaras: lvs. 



alternate Ailanthus 



Carpels 2: fr. consisting of 2 samaras 

 which separate at maturity: lvs. 



opposite 98. Aceraceae 



44b. Carpels not separating at maturity. 

 46a. Stamens numerous. 



Fls. in axillary or terminal clusters. 

 Fls. in axillary racemes: anthers linear. 105. Elaeocarpaceae 

 Fls. in terminal and lateral cymes; 



anthers suborbicular Grewia 



Fls. usually solitary, sometimes in axil- 

 lary clusters HO. Theaceae 



46b. Stamens few, not more than 10, nor more 

 than 2 xthe petals. 

 47a. Fls. regular. 

 48a. Herbs: fr. a capsule. 



49a. Fls. tetradynamous (with 6 stamens, 2 

 shorter than the other 4): lvs. 



alternate 73. Cruciferae 



49b. Fls. not tetradynamous. 

 50a. Lvs. simple. 

 51a. Leaf -blades not peltate, not bear- 

 ing tentacle-like glandular 

 hairs. 

 52a. Styles 2-5: lvs. opposite, entire. 57. Caryophyllaceae 

 52b. Styles 1. 

 53a. Lvs. alternate. 



Stamens all fertile Corchorus 



Stamens not all fertile, half 

 of them with sterile 

 anthers Corchoropsis 



53b. Lvs. opposite or basal. 



Lvs. opposite, entire: erect 

 herbs: fls. in axillary 

 clusters 1:1. Lythraceae 



Lvs. mostly basal: fls. on an 

 erect scape : anthers 

 opening by terminal 

 pores 134. Pyrolaceae 



51b. Leaf -blades peltate, bearing 



tentacle-like glandular hairs. 74. Droseraceae 



13 



