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Cushions 1 in. apart, composed of short, reddish bristles, and long, tawny red spines, about eight in each cushion, and of a peculiarly ferocious appearance hence the specific name. The stoutest spines are 3 in. long, and are sharp and strong as needles. Probably it is only a variety of O. Tuna. It requires warm-house treatment.
For its cultivation, a warm-house temperature appears most suitable; it bears a close resemblance to E. texensis. Full-sized plants are 1½ ft. in diameter, and have about a dozen ridges with acute sinuses, the ridges being rounded and even. The spines are 1 in. long, bristle-like, and are arranged in clusters of seven or nine, with a cushion of white wool at the base of each cluster.
It is the most ornamental kind. Stems and joints as in R. commune. Wings of joints usually broad, with red margins, and the hair in the notches in a dense tuft, nearly 1 in. long, pure white, and silk-like. Flowers small, white. This species, which thrives best under warm-house treatment, is a native of Brazil, and is usually grown only for its curious, Cereus-like stems.
The form of the flowers is that of a cup, nearly 3 in. across. Introduced from Mexico in 1845. Flowering season, April and May. It requires warm-house treatment.
Potts, to whose love for these plants we are indebted for a great many choice kinds collected and sent to England by him. It grows naturally in a red, sandy loam, and under cultivation requires warm-house treatment, except during the autumn, when it may be placed in a frame and exposed to full sunshine and plenty of air.
The dots marking the position of the microscopic hair-tufts are in small depressions. Flowers and fruit as in R. Cassytha, of which this might reasonably be called a variety. This species requires warm-house temperature. Stem straggling, branched.
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