Ariocarpus retusus var. furfuraceus (Wats.) Gerhart Frank
Accepted Scientific Name
Ariocarpus retusus Scheidw.
Seven Stars, Living Rock
Ariocarpus furfuraceus, Anhalonium furfuraceum, Mammillaria furfuracea
Ariocarpus retusus var. furfuraceus, also known as Ariocarpus furfuraceus, is a slow-growing cactus geophyte with a solitary grey-green stem with prominent tubercles. The stems are flattened globose, up to 4.8 inches (12 cm) tall, and up to 10 inches (25 cm) in diameter. Tubercles are up to 1.6 inches (4 cm) long and 1.4 inches (3.5 cm) wide. It differs from the standard form of the species only for its tubercles which are equilateral triangular. However, all other characteristics clearly show that they are conspecific. Flowers are diurnal, white to pinkish, up to 0.8 inches (2 cm) long, up to 2 inches (5 cm) in diameter, and appear in fall.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
You should plant your Ariocarpus in soil specifically formulated for cacti. You can buy a cactus mix at your local nursery. Do not use generic soil mixes because they will not provide enough aeration and drainage. Additionally, using a container without a hole, whether a pot or a terrarium, is a bad idea for the same reason.
Ariocarpus need a lot of sunlight. However, in hot, dry areas, they can be damaged by excessive sunlight, so you should either use a shade cloth to limit their sun or move them out of the sun during the hottest hours of the day. In more temperate areas, direct sunlight is fine.
These cacti prefer to be kept at room temperature or slightly lower with low humidity.
Water your Ariocarpus when it is dry, but then wait until the soil dries out completely to water it again. The amount of time this takes will vary depending on your climate and the size of your pot if you use one.
Learn more at How to Grow and Care for Ariocarpus.
This cactus is not accepted as a variety, and it is treated as a synonym of Ariocarpus retusus. It is naive to Mexico, widely distributed in Coahuila, San Luis Potosi, Tamaulipas, Zacatecas, and Nuevo Leon.
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