Pterocactus megliolii R Kiesling 1971

Plants with very woolly areoles and tubers to 15 cm (5.9 in) long, producing cream-colored underground stems. Stem segments rarely jointed, cylindrical, brownish green, 3-10

Pterocactusfischeri, photograph by Urs Eggli
Pterocactus hickenii, photograph by Urs Eggli

cm (1.2-3.9 in) long, 0.5-1 cm (0.2-0.4 in) in diameter. Glochids few or absent. Central spines 4-5, light to dark brown. Radial spines 10-20, flattened against the stem surface, glassy, to 2 mm long. Flowers rotate, yellow, to 3 cm (1.2 in) in diameter. Fruits dry, slightly larger than the stem segments. Distribution: north of the town of San Juan, Argentina.

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