This is a vintage botanical illustration of a cactus in bloom. The cactus is a globular shape, covered in a network of blue-green ribs and studded with sharp, dark spines. At the top of the cactus, a large, white flower is in full bloom, with numerous delicate petals radiating outwards. The flower has a yellow center. The cactus is depicted growing in a rocky, desert-like environment. Several small rocks and patches of grass surround the base of the plant. The illustration is rendered in a detailed, realistic style, with careful attention to the texture of the cactus and the delicate structure of the flower. The background is a soft, neutral color, which helps to highlight the plant. Below the illustration, there is text identifying the plant as 'Echinocactus hexaitheus' and 'Echinomastus hexaitheus'.