Rebuta simoniana Rausch 1984

Plants solitary. Stems globose, bright green, to 2.5 cm (1 in) in diameter. Ribs 13, spiraling, forming tubercles. Areoles round to oval, whitish to brown. Central spines 1-4, stout, whitish with brown tips, to 7 mm (0.3 in) long. Radial spines 11-13, glassy white, fragile, to 5 mm long. Flowers pure orange, to 3.5 cm (1.4 in) long and in diameter. Fruits globose, olive green, to 6 mm (0.2 in) in diameter. Distribution: south of Cinti, Chuquisaca, Bolivia.

Rebutía spegazziniana Backeberg 1933 Aylostera spegazziniana (Backeberg) Backeberg 1935 Rebutía rubiginosa F. Ritter 1963,/ly/ostera rubiginosa (F. Ritter) Backeberg 1963

Rebutía tuberosa F. Ritter 1963,/ly/ostera tuberosa (F. Ritter) Backeberg 1963 Rebutía mamillosa Rausch 1972 Rebutía froehlíchiana Rausch 1975 Rebutía taríjensis Rausch 1975 Rebutía fusca F. Ritter 1977 Rebutía patericalyx F. Ritter 1977 Rebutía tarvitaensis F. Ritter 1977 Rebutía vulpina F. Ritter 1977 Rebutía zecheri Rausch 1977 Rebutía sumayana Rausch 1986

Plants forming dense clusters. Stems globose to short cylindrical, yellowish green, 6-9 cm (2.4-3.5 in) high, 2-5 cm (0.8-2 in) in diameter. Ribs about 18, forming prominent tubercles. Areoles small, white. Central spines 3-6, yellow with brown tips, to 3 mm long. Radial spines as many as 14, flattened against the stem surface, yellowish, sometimes with brown tips, to 4 mm long. Flowers bright red, to 4 cm (1.6 in) long and in diameter. Fruits globose, reddish green. Distribution: Bolivia and Argentina. Rebutía spegazziniana is a widespread and variable species that has received an undue number of names.

Rebutía spinosissima Backeberg 1935 Aylostera spinosissima (Backeberg) Backeberg 1935 Rebutía hoffmannii Diers & Rausch 1977 Rebutía archibuiningiana F. Ritter 1978 Rebutía walteri Diers & Esteves 1989

Plants commonly clustering and forming dense cushions. Stems globose to flattened globose, bright green, to 4 cm (1.6 in) high and in diameter. Ribs about 15, distinctly tubercu-

Rebutia spinosissima

late. Areoles small, closely spaced, white. Central spines 5-6, somewhat stout, yellowish white to brown, to 12 mm (0.5 in) long. Radial spines numerous, fine, bristle-like, whitish, to 10 mm (0.4 in) long. Flowers yellowish orange to medium red, 3-4 cm (1.2-1.6 in) long and in diameter. Fruits small. Distribution: Bolivia and Argentina.

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