Key to the System of 



28. Petals always disconnected. 



Stipules often absent or rudimentary; sepals and petals five, 

 seldom four; filaments often united at the base and there 

 gland -bearing ; fruit lobeless, but usually dehiscent along 

 the dissepiment, with often subdivided partitions. 



Lineae. 148 



Petals nearly always connected. 



Stipules absent or rudimentary ; petals five, often much 

 cohering; fruit consisting of three to five indehiscent 

 fruitlets; fruit-axis persistent. Figure 29. 



Stackhousieae. 149 



29. Stipules often absent. 



Leaves simple or oftener pinnate; flowers often unsym- 

 metrical; stamens mostly inserted between the ovulary 

 and the disk; fruit mostly dehiscent; embryo generally 

 curved. Figure 27. Sapindaceae. 150 



Stipules often present ... ... ... ... ... 30 



30. Stamens usually disconnected. 



Petals four to five; styles generally united; fruit consisting 

 of free or coherent fruitlets, rarely consolidated and hard 

 inside (a drupe.) Figures 16 and 17. Zygophylleae. 152 



Stamens usually connected. 



Petals generally five; fruit consolidated or consisting of 

 three to five free or connected fruitlets ; fruit-axis per- 

 sistent. Figure 18. Geraniaceae. 



31. Anthers one-celled. 154 



Petals united at the base with the tube of the stamens; 

 stamens usually indefinite in number ; anthers bivalved ; 

 fruit consolidated or consisting of coherent or seceding 

 fruitlets, whorled around a central columnar axis ; seeds 

 fixed to the axils of the fruit. Figure 19. 



Malvaceae. 157 



Anthers two-celled ... ... ... ... ... 32 



32. Fruit always two-celled. 



Petals four to five; stamens eight to ten, disconnected; 

 anthers opening each by a terminal pore ; fruit entire ; 

 seeds pendent. Tremandreae. 162 



Fruit generally three- to five-celled or consisting of 

 distinct fruitlets ... ... ... ... ... 33 



