Iodine is a chemical element with symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas. The elemental form was discovered by the French chemist Bernard Courtois in 1811.
Definition of CHOLLA. : any of numerous shrubby opuntias chiefly of the southwestern United States and Mexico that have needlelike spines partly enclosed in a papery sheath and cylindrical joints âcalled also cholla cactus.
The Munz Cholla shown is over 5 ft. tall and get even bigger. They grow in an area around the Bradshw Trail in Ca. Growing in the Colorado Desert it is a rare cactus in the desert and can reach heights of 10 to 15 ft.