Pterocactus gonjianii R Kiesling 1982

Plants with many stems, often branching, few spines. Roots thick, tuberous. Stems not jointed, cylindrical, purple, 5-10 cm (2-3.9 in) long, 1-1.5 cm (0.4-0.6 in) in diameter, with prominent tubercles. Glochids numerous, 2 mm long. Spines 6-10, not differentiated as centrals and radials, glassy to light brown, 1-4 mm long. Flowers borne apically, rotate, cream or yellow to pinkish white, 4-5 cm (1.6-2 in) in diameter.

Pterocactus Reticulatus
Pterocactus araucanus, photograph by James Mauseth

Pterocactus reticulatus 595

Fruits dry, to 2 cm (0.8 in) in diameter. Distribution: San Juan, Argentina.

Pterocactus hickenii Britton&Rose 1919 Opuntia skottsbergii Britton & Rose 1919, Pterocactus skottsbergii (Britton & Rose) Backeberg 1950

Plants with numerous stems. Roots tuberous with several narrow-necked segments. Stem segments globose to cylindrical, 2-5 cm (0.8-2 in) long, to 1 cm (0.4 in) in diameter, completely covered with spines. Glochids numerous. Spines about 20, needle-like, straight, rigid, brownish to black, sometimes yellowish, 10-20 mm (0.4-0.8 in) long. Flowers borne terminally on pedicel-like structures, yellowish with pink edges, to 3 cm (1.2 in) long and in diameter. Distribution: Chubut and Santa Cruz, Argentina.

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