The most common plant, L. williamsii, grow in North America, mostly in Mexico, can be found in the Chihuahuan desert of southern Texas and northern Mexico. The size is about eight centimeters (three inches) wide and five centimeters (two inches) tall. It is mostly blue green in color, with pink to white flowers, growing in groups among scrub, in areas with limestone soil. L. diffusa grows only in a small area in central Mexico, the color is yellow green, with white to yellow flowers.