Green Leaves at Work 111 
Fic. 22.—Four natives of South Africa. 
x, a groundsel (Senechto (Kleinia) Haworthit); 2, a typical cactus (Eichinocactus 
coe 3, a spurge (Euphorbia globosa); 4, a milkweed (Stapelia cacti- 
‘ormis). 
