Ferocactus robustus

Ferocactus robustus forms large cushions reaching a height up to 100 centimetres (39 in) and a diameter up to 5 metres (16 ft). This plant is spherical to club-shaped and has eight sharp-edged tuberous ribs with a diameter of 8 to 16 centimeters. The areoles, where thorns arise, are spaced far apart. The reddish or purple thorns include four to seven strong, protruding, straight central spines up to 6 centimeters long, and 10 to 14 lighter-colored radial spines, with upper ones resembling the central spines and lower ones being bristle-like.

The funnel-shaped flowers are yellow and reach a length of 3–4 centimetres (1.2–1.6 in). The fruits are spherical, fleshy, yellow, 2 to 3 inches long.^[2]

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  F. robustus in bloom
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  Flower
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  Plant cluster
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  Plant

Ferocactus robustus is widespread in the states of Puebla and Veracruz in Mexico at elevations of 700 -1000 meters.

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  Plant growing in Tehuacán Valley matorral