478 



CXXII. EUPHORBIACE^ (bROWN). 



[Euphorbia. 



Stem anil branches terete or slightly angular, 



but without wing-like angles. 



Ovary densely and conspicuously tubercu- 



late, glabrous ; leaves very variable . 



Ovary iiot tuberculate or in 62, S. 



agandensis, with a few inconspicuous 



tubercles, glabrous to tonieutose. 



f Involucres solitary, terminal or in the 



forks of the branches or both, 



sometimes forming terminal 2-3- 



Howered cymes, or scattered along 



one side of long flowering branches, 



in 37, -S. claytonioides, somewhat 



congested on the short ixltimate 



(livisions of the repeatedly forked 



branches, never in umbels or beads. 



Plant 3-15 in. high. 



Iroaves opposite or only those 

 alternate that are on the main 

 stem below its point of 

 branching. 

 Leaves very shortly but distinctly 

 j»etiolate, linear; ovary and 

 capsule sprinkled with minute 

 adpressed hairs 

 Leaves sessile, linear-filiform to 

 linear-lanceolate ; ovary and 

 capsule glabrous. 

 Flowers in the forks of the 

 branches or axillary; in- 

 volucre-glands 2-horiied 

 Flowers at the ends of elon- 

 gated slender branches ; in- 

 volucre-glands not 2-horned 

 Leaves sessile, broadly reniform- 

 ovate ; involucre scarcely 1 lin. 

 in diam. .... 



Leaves alternate or those at the 

 flowering nodes opposite. 

 Involucre subsessile or on ped- 

 uncles 1-2 lin. long ; leaves 

 linear. 

 Leaves ^-1'. in. long; in- 

 volucre minutely puberulous 

 Leaves 2-5^ in. long; in- 

 voluci'e glabrous 

 1 nvolucres on peduncles 3-12 lin. 

 long, and together with the 

 ovary more or less tomen- 

 tose. 

 Involucre-glands not tuber- 

 culate on the inner or upper 

 surface .... 

 I nvolucre-glands ttiberculate 

 on the u])pcr or inner surface 



70. E. depauperate. 



33. E, glaucella. 



34. E. dracuncnloidcs. 



30. E. macra. 



37. E. claytonioides. 



45. E. hongensis. 

 4G. E. calva. 



47. E. Oatesii. 



48. E. VerdicJcii 



