Synadenium. 



CXXII. EUPHORBIACE^ (bROWN). 



463 



and probably more numerous than have been supposed, their great resemblaace to 

 one another causing them to be overlooked. 



Leaves finely pubescent above or on both sides ; perianth 

 rudimentary or very minutely 3-crenate, 

 Leaves 3^-4^ in. long, with a distinct wing-like keel 

 to the midrib beneath. 

 Leaves pubescent all over on both sides ; keel on the 



midrib toothed . . . . . . . G. <S. molle. 



Leaves pubescent above, glabrous beneath, except on 



the midrib ; keel on the midrib not toothed . 7. S. Kirkii. 



Leaves 4^-6 in. long, pubescent above, glabrous and 

 without a wing-like keel to the prominent midrib 



beneath 9. 5, gazense. 



Leaves glabrous on both sides. 



Midrib with a wing-like or very acute keel beneath at 

 the base or all along; perianth rudimentary or 

 very minutely 3-crenate. 

 Leaves 3-5 in. long; capsule (where known) not 

 exsertcd much beyond the involucre. 

 Peduncles branching at the apex into an umbel of 

 4-5 undivided rays ..... 

 Peduncles umbellately or subumbellately branch- 

 ing at the apex into 3-5 rays 2-3 times forked. 

 Cyme compact, with the rays all arising from 

 tlie same point or level .... 

 Cyme lax, with the rays closely placed but arising 

 one above another ..... 

 Leaves mostly 5-6 in. long (some smaller) ; cymes 

 lax; capsule exserted 2-3 lin. beyond the in- 

 volucre 



Midi ib prominent and obtuse or subacute beneath, but 



without a wing-like keel. 



Leaves not more (usually much less) than twice as 



long as broad ; umbels with undivided 1-flowered 



rays ........ 



Leaves 2-4 times as long as broad. 



Umbels with the 3-5 primary rays umbellately 

 divided into 3-4 secondary rays; perianth 

 rudimentiiry . . . . . . . 3. (S. umhellatnm. 



Cymes dichotomously 2-6 times forked. 



Perianth a rudimentary 3-crenate rim; styles 



deeply bifid , 10. -S. Grantii. 



Perianth with linear, subulate or filiform lobes 



^-1 lin. long. 



Leaves ciineate-oblanceolate, tapering from 



near the apex to the subsessile base; styles 



thickened at the apex, not bifid . . 11. -S. angolense. 



Leaves lanceolate, tapering for about J of 



their length into the petiole ; styles bifid . 12. S. cymosum. 



1. S. Cameronii. 



4. S. compactum. 



5. S. carinafum. 



8. S, glaucescens. 



2. S. Volkensii. 



1. S. Cameronii, X. E. Br. in Kew Bulletuiy 1901, 133. Stems 

 clustered, 7-8 ft. high, terete, fleshy at the young parts, glabrous. 

 Leaves somewhat fleshy, subsessile or shortly petiolate, 3 in. or more 

 long, IJ in. or more broad, only one seen, cuneately obovate, shortly 



