Xerophyte

Central Spines

3 to 4, up to 6 mm long, dark brown, darker at base.

Seeds

Oblong, glossy black about 1 mm long and 0,7 mm wide, hilum basal, somewhat oblique, white.

Roots

Fibrous.

Note

Rebutia minusculaSN|15391]]SN|15391]] is quite variable. The differences concern the spination and flowers colour, however the size and number of spines is greatly influenced by the conditions of culture, at lower light levels the spines are less numerous, delicate and white, while with strong solar radiation the spines are stronger with a yellowish tint. In some cases differences are referable to separate population, but often occurred over a long period of cultivation due to autogamy. Many such variants have been described as species in the past.

Tubercles

Low, flat conical.

Flowers

Slender funnel-form, 45 mm long, 40 mm wide, both inside and outside pale pink to bright violet pink . Self fertile. Buds pointed, light green. Flowers grow in profusion from the older areoles on the bottom half of the stem, often at the stem bases. Pericarpell, pale to olive green almost spherical, pale red, naked, covered with several darker red scales. Floral tube funnel-form, about 12 mm long, with pale green scales without hair bristles, which gradually change in the outer tepals. Outer perianth segments (tepals) acute-lanceolate, with a marked brownish mid strip on the outside. Inner perianth segment slightly wider, usually bright pink. Filaments yellow, anthers yellowish. Style free to base, pink, stigma with 4-5 white lobes only slightly protruding the anthers.

Ribs

16-21 with low, vertical or spiralled with distinct tubercles.

Stem

Flattened globose to globose, apex depressed and spiny, bright green, bout 50 mm in diameter.

Radial Spines

About 8 to 10, fine 3-6 mm long, white to light brown, at first lighter.

Fruits

Globose, yellow-green, to 6 mm in diameter, drying and cracking irregularly.

Areoles

Small on top of tubercles, circular to slightly elliptical, 1,5 mm long, about 5 mm apart. Slightly covered with short greyish felt, soon bare