PLATE 2 
A. — Parosela arborescens (Torr.) Heller characteristic of washes in this portion 
of the desert. Many other plants are usually associated with it. West of 
Imperial, Calif., April 21, 1918. 
B. —Giant cactus and paloverde association. Illustrates the rough and stony 
character of the soil and the variety of plant forms. Prominent in the picture 
are Covillea glutinosa (Engelm.) Rybd., Franseria dumosa A. Gray, F. deltoides 
Torr., Carnegiea gigantea (Engelm.) Britton & Rose, Ferocactus wislizeni (Engelm.) 
Britton & Rose, Opuntia bigelovii Engelm., Fouquieria splendens Engelm., Cer- 
cidium torreyanum (S. Wats.) Sarg., Encelia farinosa A. Gray, etc. North of 
Sacaton, Ariz., March 13, 1915. 
