A cactus is from the plant family Cactaceae. Most of the species have a stem that is photosynthetic and succulent, with leaves that have evolved into spines. Cacti come in different sizes and shapes.The tallest, Pachycereus pringlei +/- 19.2m and the smallest Blossfeldia liliputiana about 1cm in diameter at maturity.
Cactus flowers are large and very attractive. Most of the colours are yellow, white or shades of red and purple. Many species are pollinated by bats and moths in the evenings. Cactus fruits are berries and are usually edible.