Plants producing several stems with spines not covering them. Stem segments globose to pear shaped, arising one above the other, gray-brown, 3-4 cm (1.2-1.6 in) long, 1-1.5 cm (0.4-0.6 in) in diameter. Glochids absent. Spines about 8, pectinate, yellowish with darker tips, to 3 mm long. Flowers reddish brown, opaque, to 4 cm (1.6 in) in diameter. Fruits borne apically, globose, 2 cm (0.8 in) in diameter. Distribution: plains of Neuquen, Argentina.
Pterocactus australis (f. a. c. Weber) Backeberg 1950 Opuntia australis F. A. C. Weber 1899
Stem segments globose to pear shaped, arising one above the other, greenish brown to purplish, to 8 cm (3.1 in) long, 1-1.5 cm (0.4-0.6 in) in diameter. Glochids few and inconspicuous. Central spines 1-2, present only at the stem tips, pointing upward, thick, flattened, whitish to brown or black, to 20 mm (0.8 in) long. Radial spines 10-15, white, 3-4 mm long. Flowers yellow with pinkish or brownish tint, 2-3 cm (0.81.2 in) in diameter. Fruits with areoles falling away when ripe. Distribution: Santa Cruz and Chubut, Argentina.
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