That whitish-looking tree is another cholla. Like the Teddybear cholla, its joints (or segments) are very easily detached - so much so that they appear to 'jump' at unwary passers by. Hence its common name - the 'Jumping Cholla'.
This cholla's detachable segments can also root and become new plants. Many of the chollas reproduce that way, but other cacti (like the saguaro) do not. What do you think are the advantages and disadvantages (in this kind of habitat) of reproducing 'vegetatively' like that?
