FRONTISPIECE 



A mature plant ot Opnntin ffihiiihi on reservation of Desert Laboratory at Tucson, showing 

 a frequent tvpe of forked trunk, due to injury of main axis, also the branching habit 

 and clusters of fruit. The nesting bird is the cactus wren, Hdcodyti's hrunncicapillus 

 cMuesi (Sharpe). 



