Xerophyte

Central Spines

usually absent, or rarely 1 yellowish, 1-2 mm long.

Seeds

Oblong spherical, about 1-1,2 mm long and 0,8-1 mm wide, brown-black, testa quite distinct, oblong, slightly convex.

Description

Rebutia diersianaSN|4416]]SN|4525]] is one of the many geographical forms of the extremely variable Rebutia pygmaeaSN|4525]]SN|4416]]. It has a distinctive yellow or orangish-yellow flowers.

Roots

Tap root .

Tubercles

About 2,5 mm high.

Flowers

From the basal parts of the stem, widely funnel-shaped about 30 mm long and wide. Ovary greenish with a few dark green scales with white wool and bristles. Floral tube, pink with few, narrow, dark green scales with white wool and bristles. Outer perianth segments lanceolate, pinkish-yellow with darker purple tip and with purple central ribs. Inner perianth segments lanceolate, pale yellow to golden yellow. Throat white. Filaments white. Pistil greenish-white, stigma with 5-6 greenish segments.

Ribs

About 10 slightly tuberculate.

Stem

1 to 2 cm wide, spherical to slightly oblong, becoming short-cylindrical in cultivation. Epidermis light green , often with a purple-brown tinge.

Fruits

Spherical, greenish, about 6 mm large.

Habit

It is a small geophyte cactus, with a heavy tap root that may exceed the size of the plant above soil level. Solitary or often clustering in cultivation.

Blooming Season

Flowers all tend to come in one late Spring rush, rather than spread over the Summer.

Radial Spines

1-12, thin, bristly, pectinate, glassy white, 1-2 mm long.

Areoles

Oval, slightly whitish tomentose, 2 mm long, with abundant white or light brown felt, a little far apart.