Rebuta marsoneri Werdermann 1937

Rebutía senilism, hyalacantha Backeberg 1932, not validly published; R. hyalacantha (Backeberg) Backeberg 1959, not validly published Rebutía krainziana Kesselring 1948

Plants usually solitary, depressed globose, light green with gray scales, to 4 cm (1.6 in) high and 5 cm (2 in) in diameter. Ribs forming low, rounded tubercles. Areoles small, round, brownish white. Spines 30-35, variable, bristle-like, flexible to somewhat stout, brownish to golden yellow to white, usually with dark tips, 3-15 mm (to 0.6 in) long. Flowers golden yellow to orange, 3.5-4.5 cm (1.4-1.8 in) long, 3-3.5 cm (1.2-1.4 in) in diameter. Fruits globose, brownish, to 5 mm in diameter. Distribution: Jujuy, Argentina.

Rebutía mentosa (F. Ritter) Donald 1987 Sulcorebutia mentosa F. Ritter 1964, Weingartia mentosa (F. Ritter) F. H. Brandt 1979

Sulcorebutia flavissima Rausch 1970, Weingartia flavissima (Rausch)

F. H. Brandt 1979 Sulcorebutia markusii Rausch 1970, Weingartia markusii (Rausch) F. H. Brandt 1978

Weingartia torotorensis Cárdenas 1971, Sulcorebutia torotorensis

(Cárdenas) F. H. Brandt 1976 Weingartia purpurea Donald & A. B. Lau 1974, Sulcorebutia purpurea (Donald & A. B. Lau) Brederoo & Donald 1981, Rebutía mentosa subsp.purpurea (Donald & A. B. Lau) D. R. Hunt 1997 Sulcorebutia santiaginiensis Rausch 1979

Weingartia formosa F. H. Brandt 1979, Sulcorebutia formosa (F. H.

Brandt) Pilbeam 1985 Weingartia albissima F. H. Brandt 1980, Sulcorebutia albissima (F. H.

Brandt) Pilbeam 1985 Sulcorebutia swobodae K. Augustin 1984 Sulcorebutia unquispina Rausch 1985 Sulcorebutia augustinii G. Hentzschel 1989

Plants freely forming clusters. Stems flattened globose to globose, fresh green, to 6 cm (2.4 in) in diameter. Ribs about 20, spiraling, forming distinct tubercles with chinlike protrusions. Areoles elongate, white. Spines reddish brown to black. Central spines 2-5,5-8 mm (0.2-0.3 in) long. Radial spines 10-18, pectinate, to 5 mm long. Flowers purple, to 3 cm (1.2 in) long and 3.5 cm (1.4 in) in diameter. Fruits globose, brown, 7-10 mm (0.3-0.4 in) in diameter. Distribution: Campero province, Cochabamba, Bolivia.

Two subspecies of Rebutía mentosa are recognized. Subspecies mentosa has 2-4 central spines and 14-18 radials; it occurs near Aiquile. Subspecies purpurea has 4-5 central spines and 10-12 radials; it occurs near Cruce.

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