Here is just a sampling of some of the cactus from the Cactus Garden:

UPPER MIDDLE: not sure what that was but its top was rather interesting. LOWER RIGHT: don't know what that is either but I like the lines of it.

LEFT is the Boojum Tree: It is nearly endemic to the Baja California Peninsula, with only a small population in the Sierra Bacha of Sonora, Mexico. The plant's English name, Boojum, was given by Godfrey Sykes of the Desert Laboratory in Tucson, Arizona and is taken from Lewis Carroll's poem "The Hunting of the Snark".

LOWER MIDDLE is the Senita (Pachycereus schottii, Cactus Family ( Cactaceae ), Cactus. Also called Whisker Cactus. The Senita looks very similar to the Organ Pipe cactus, but the senita has a dense cluster of spines near the top of mature branches. The spines on the senita look like whiskers, hence the name “Old Man.” Only the mature branches have the spine cluster.)

UPPER RIGHT is the Cardon Grande: Echinopsis terscheckii, Cactus Family ( Cactaceae ), Cardon Grande Cactus. Also called: Echinopsis terscheckii, Golden Saguaro, Argentine Saguaro, San Pedro Cactus, or Cardon Santo “sacred cactus.” .
The Cardon Grande is probably the largest Echinopsis.