LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY
Potted cactus plant. Potted polka dot cactus (Opuntia microdasys). This cactus originates from Mexico. It grows up to 90 centimetres high and spreads nearly 2 metres wide if allowed. Cacti evolved in arid environments, and have tissues adapted to minimise water loss. Cactus leaves are reduced to narrow spines (white), and the plant surface is covered in a thick, waxy outer layer. Many cacti also have a means of storing water.
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