Pterocactus fischeri Britton Rose 1914

Stem segments cylindrical, unbranched, tuberculate, greenish brown, to 15 cm (5.9 in) long, 1-1.5 cm (0.4-0.6 in) in diameter. Glochids numerous, yellowish, 3-4 mm long. Central spines usually 4, often present only in upper part of stems, brown or black, with yellowish tips, flattened and papery, 10-50 mm (0.4-2 in) long. Radial spines 12 or more, bristle-like, whitish, 6 mm (0.2 in) long. Flowers coppery yellow to clear brown or purple, to 2.5 cm (1 in) in diameter. Fruits strongly tuberculate, 2-2.5 cm (0.8-1 in) in diameter. Distribution: Neuquen and Mendoza, Argentina.

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