EUPHORBIA.] 



EUPHORBIACE&. 



73 



Branches terete or 5-angled ; leaves 

 many, 6-12 in. long : 



Branches subterete, the spines aris- 

 ing from low distant spirally 

 arranged tubercles . 



Branches angular, the spines arising 

 from thick subconfluent tubercles 

 arranged in more or less regular 

 rows . ... 



Branches spreading, unarmed, cylindric ; 

 leaves none or few and small ; style - 

 arms 2-lobed, short, recurved 



Annual or perennial herbs with slender erect 

 ascending or prostrate stems, leafy 

 throughout : 



Leaves alternate below and opposite above 

 or all alt. except the uppermost floral 

 leaves, exstipulate ; glands of involucre 

 2-horned, without a petaloid limb : 

 Rootstock not proliferous ; seeds stro- 

 phiolate : 



Leaves less than 2 in. long ; seeds 

 oblong, with a whitish rugose or 

 tuberculate testa. An annual 



Leaves over 2 in. long ; seeds oblong, 

 bluish. An annual or perennial 

 herb . .... 



4. E. neriijolia. 



5. E. ligularia. 



6. E. Tirucalli. 



7. E. dracunculoides . 



8. E. Rothiana. 



Rootstock usually with proliferous 

 shoots ; seeds globose, smooth, with- 

 out a strophiole . . 8. E. prolifera. 



Leaves all opposite, stipulate or, if stipules 

 are absent the leaf -attachments are con- 

 nected by a transverse interpetiolar 

 raised line ; glands of involucre not 2- 

 horned : 



Glands of involucre with a prominent 

 membranous petaloid limb : 



