Tohono Chul Park

Saguaro cactus

This is the iconic cactus of southwest US -- saw them all the time in old TV cartoons, Westerns, etc. as a kid.
But you won't see it (wild) in New Mexico, or in Texas, or in Utah. Only in Arizona, in the Sonora state in Mexico (below Arizona) and in a teeny part of Southeast California. Climate I guess.

They are even on most Arizona license plates.

Blue Bells

Pretty flower

Note the plant with the red flower has teeny leaves. Good for conserving moisture in the desert I'm told. 

Mexican Fencepost

Used as fencepost because its prickly, but not so prickly it will injure pedestrians and lead to lawsuits.

Ocotillo

Ocotillo means "little torch" in Spanish, the red flowers at the end of the branch being the torch. Below the torch is thorns and interspersed with leaves. The plant looks dead when there is no rain but fortunately this year was wet and green.

Barrel cactus

Palo Verde and prickly pear

Many Cacti grow up in the shade and protection of regular trees (like this Palo Verde).

Sculpture

Made from 100% recycled materials.

Guide w/tourists

Lots of retired "snowbirds" in southern Arizona. At the museums and parks in Tucson, a lot of them are volunteers. This "docent" in the blue was from Michigan.