26 



cxxiiic. HORACES (Rendle). 



[Dorstenia. 



Receptacle without bracts on the sides (section 

 Eudorstenia) : 

 a. Stems generally herbaceous, sometimes woody 

 below, more rarely suffruticose ; female 

 flowers distributed over the greater part of 

 the receptacle : 

 ♦Receptacle more or less orbicular or stellate, 

 floriferous nearly to the edge of the disc, 

 bearing slender marginal bract -arms : 

 Receptacle with crowded very unequal bract- 

 arms ... ... ... ... ... ... Z. D. ciliata. 



Receptacle with bract-arms spaced round the 

 margin : 

 Bract-arms fairly equal, longer than the 

 diameter of the, receptacle : 

 Leaves very broadly elliptic ; receptacle 



suborbicular or irregularly stellate ... 4. Z). Mannii. 

 Leaves elliptic, obovate-elliptic or oblong- 

 lanceolate ; receptacle with regular 

 stellate margin : 

 Leaf -base obtuse : 

 Stipules 2 lin. or less in length 



Stipules 4-6 lin. long 



Leaf -base acute 



Bract-arms very unequal : 



Leaf -base acute 



Leaf-base blunt : 



Leaves small, 1^-4 in. long : 



Receptacle stellate 



Receptacle suborbicular : 



Bracts reaching 1 in. or more in 

 length : 

 Leaves blunt 

 Leaves acuminate 

 Bracts not exceeding 2 lin. in length 

 Leaves 3^-9 in. long : 



Receptacle 4 lin. in diameter 

 Receptacle 5-8 lin. in diameter : 

 Longer bract-arms reaching IJ in. 

 Longer bract -arms reaching 5 lin.... 

 ♦♦Receptacle orbicular with toothed margin : 

 Stem erect : 



Rhizome slender 



Rhizome fleshy, tuber-like 



Stem weak, more or less decumbent, growing 

 from a small pea-like tuber 



Stem creeping 



♦♦Receptacle rhombic to oblong or oval or 3-5- 

 angular : 

 •fSome of the bract-arms exceeding the diameter 

 of the receptacle : 

 Receptacle with a long bract-arm at each end 

 and intervening shorter ones : 



Long bract-arms to 5 lin. long 20. 



Long bract-arms to 1 in. long ... ... 21. 



Long bract-arms 1^-21 in. long 22. 



I 



D. lotziana. 

 D. gabunensis. 

 D. Tessmannii. 



