These are tall plants, branching at the base. Several species present a development of white, yellowish, or brownish wool from the areoles on the top of the plant or the flowering part of the stems. They seldom flower in cultivation, and the flowers are comparatively small.

Pachycereus Pringlei. Mexico and Lower California. The young plants are very attractive and easy to grow from seed. There are 10 to 16 ribs, with numerous spines on the large areoles; the central spines number I to 3, and are stronger and longer than the radials. This plant prefers a sandy soil in full sunshine.

Pachycereus chrysomallus. A beautiful species of slow growth, having 12 to 15 ribs. The radial spines number 8 to 10, with 1 to 3 central spines, which may reach a length of 5 to 6 inches. Creamy white flowers are produced near the top, beginning as compact masses of brownish wool which cover the ovary and the lower part of the flower.

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