2o-i EUPilOiiDlACEyE (Bi'owii). [Enphorhia. 



Cyineri on jjecluncles ^-1 in. long; 



branches .-^-l liu. thick, suberect, 



diverging from each other at the 



base at an angle of 45^-50° ... (56) arrecta. 



"Bract.-^ under the involucres -spathulatCj 



with a distinct petiole-like part or 



ol^ovate and distinctly narrowed to 



the basGj green or brown : 



Branches 1^-2 liu. thick, diverging 



from each other at an angle of 



90*^-110^ and spreading ; cymes 



sessile or subsessile (42) indecora. 



Branches |-1 lin. thick, diverging from 

 each otlier at the base at an angle 

 of iO^'SC^, then erect or a.scend- 

 ing ; involucres solitary and pedun- 

 culate or 2 to several in pedunculate 

 cymes : 

 Bracts persisting during the flower- 

 ing period or matin-ing of the 

 fruit ; western region ... ... (53) sparCaria. 



Bracts <^]^viickly falling off or before 

 the maturing of the fruit ; 

 Kalahari, central and eastern 



I 



regions ; 



riant 2-3 ft. high, with stems 



2-3 lin. thick at the base ... (pb) rectirama. 



Plant 1-2 ft. high, with stems 

 1-2 liu. thick at the base : 

 Involucre solitary or occasionally 

 2-3 on pednncleB usually 

 1-6 lin. (or more) long ... (58) rhombifolia. 



Involucres 3 together, sessile in 



a cluster on peduncles 1-2 



lin. long ,., (53) rhombifolia, 



var. ^• 



Involucres three to many in 



1-5-times forked cymes : 



Cymes (including the 



peduncles) J-l:| in. long, 



not very lax (58) rhombifolia, 



var. 7. 



Cymes (including the 

 peduncles) 1-2J in. long, 

 very lax,., (58) rhombifolia, 



V 



ar. 5 



**Stemj rootstock or main body of the plant usually very 



much thicker than the branches, and globose, pear- 

 shaped or cyliudric, often partly or quite buried in 

 the ground, or in a few species unbranched and 

 cylindric, or when branched scarcely thicker than 

 the branches, or branching at the base in a clump- 

 like manner ; branches cylindric, not jointed, and 

 together with the stem always covered with closely 

 placed tubercles separated (when alive) by impressed 

 lines : 



fPeduncles persisting several seasons, withering or in a 

 . few species remaining green : 



/ 



