One of the most popular of the small South American cacti is Rebutía, easily grown and producing lovely flowers. This popularity, however, has resulted in a large number of described species, most of which cannot be accepted when extensive field studies and other analyses are done. Rebutía (type, R. minuscula) was described as a genus with a single species by Karl Schumann in 1895, honoring Monsieur P. Rebut, a wine grower and cactus dealer who lived in Chazay d'Azergues, France. Schumann lowered Rebutía to a subgenus of Echino-cactus in his major monograph of 1897-1898, however.

The great popularity of these cacti has led to the description of several additional genera, none accepted by the International Cactaceae Systematics Group. Rebutía tends to be small, solitary or in clusters, globose to short cylindrical, with tubercles bearing small spines but not forming ribs. Flowers are open during the day, small, funnelform, and have slender floral tubes. The pericarpels have small scales that are naked or only slightly hairy. Rebutía comprises 41 species. It is thrilling to see these small plants in flower in their natural habitat, and it is certainly no wonder that hobbyists find them some of the most satisfying of all cacti. Two noteworthy publications, by C. Marsden and H. S. Jackson (1968) and John Pilbeam (1985), deal with Rebutía as defined here.

Rebutía K. Schumann 1895 Aylostera Spegazzini 1923 Spegazzinia Backeberg 1933 Medioiobivia Backeberg 1934 Weingartia Werdermann 1937 Digitorebutia Burning 1940 Suicorebutia Backeberg 1951

Subfamily Cactoideae, tribe Trichocereeae. Plants small, low growing, solitary or many-stemmed, globose to short cylindrical. Ribs poorly developed orabsent. Tubercles usually present. Areoles round,

600 Rebutía oval, elliptical, or linear. Spines weak, usually bristly, barely distinguishable as centrals and radials. Flowers often numerous, borne at areolesto the side or nearthe base, open duringthe day, funnelform, fairly small, variously colored but most often deep orange to yellow; pericarpels and floral tubes with numerous small scales, naked or sometimes with a few hairs or even bristles; floral tubes short to elongate, usually slender, sometimes curved; stamens in a single series. Fruits small, subglobose, thin walled, juicy at first, becoming dry at maturity; floral remains persistent. Seeds oval, glossy black, tuber-culate to wrinkled. Distribution: eastern Andes and adjacent hills of Bolivia to northwestern Argentina.

Rebutía albiflora F. Ritter &Buining 1963 Aylostera albiflora (F. Ritter & Buining) Backeberg 1963

Plants globose, forming clusters. Stems bright green, to 1.82.5 cm (0.7-1 in) in diameter. Ribs 14-16, spirally arranged, forming distinct tubercles. Central spines about 5, white with dark tips. Radial spines as many as 15, white, to 5 mm long. Flowers white with pinkish midribs, to 2.5 cm (1 in) in diameter; pericarpels and floral tubes with white bristles. Fruits small, elongated, bronze to reddish green. Distribution: northeastern Tarija, Bolivia.

Rebutía albopectinata Rausch 1972 Lobivia albipectinata (Rausch) Neirinck 1994 Rebutía schatzliana Rausch 1975 Rebutía supthutiana Rausch 1976

Plants solitary, globose, gray-green, to 1.5 cm (0.6 in) in diameter. Ribs as many as 16, vertical, forming distinct tubercles. Areoles oval, white or light brown. Central spines 0-2, white, to 1 mm long. Radial spines as many as 13, one directed downward, others in pairs, white, flattened against and covering the stem, to 3 mm long. Flowers red with pink to white throats, to 5 cm (2 in) long and 4.5 cm (1.8 in) in diameter; pericarpels and floral tubes with white hairs and bristles. Fruits globose, to 5 mm in diameter, with white hairs and bristles. Distribution: Culpina, Chuquisaca?, Bolivia.

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