Cactus

Cactus forming several flat pads
Spines very tiny; flowers a bright pink	Beavertail cactus
Spines long; flowers yellow	Old man prickly pear
Cactus forming cylindrical stems, singly or in clumps
Cactus low; less than 12 inches high
Spines hooked at end
Flowers pale pink to rose	Fish-hook cactus
Flowers red-purple	Mojave fish-hook cactus
Spines straight or curved
Cactus single; 4 to 8 inches high; flowers rose-violet	Foxtail cactus
Cactus 8 to 12 inches high; in clumps
Spines curved; flowers red	Mojave mound cactus
Spines straight; flowers crimson-magenta	Hedgehog cactus
Cactus higher than 12 inches
Stems very thin and branched	Pencil cholla
Stems thicker than 1/2 inch
Stem single; unbranched; barrel-shaped	Barrel cactus
Stem branched
Spines numerous, giving a fuzzy appearance
Spines silvery	Silver cholla
Spines straw-colored	Teddy-bear cholla
Spines less numerous; flowers red to yellow	Buckhorn cholla