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Description: Solitary, flattened globose cactus
Stem: Sub-globose to depressed globose, up to 35 mm wide and up to
15 mm high
Ribs: Divided into tubercles, arranged in 5 and 8 spirals with 3
or 4 tubercles per spiral, dull medium green, up to 5 mm high, rhomboidal
and up to 10 mm wide at base, conoidal.
Areoles: About 1 mm long, copiously woolly with thick, long,
white wool in youth, soon becoming bare
Spines: 6 to 7, and occasionally with an additional upper
(sub-central) spine, glassy white with blackish tip, slender acicular,
relatively stiff and slightly recurved, spreading, radiating; lower
three spines up to 5 mm long, upper lateral spines
up to 7 mm long, upper
spine (s) ca. 18-22 mm long and generally incurved, connivent over the
top of the stem, or occasionally erect to somewhat tortuous;
Flowers: White or pink, 35 mm wide, ca. 18 to 25 mm long;
perianth segments with a slightly darker pale pink or pale tan
middle-stripe; outer segments with a brownish middle-stripe on the outer
surface; style white to pale cerise with 3 to 6 whitish stigma lobes
which overtop anthers; stamens numerous with pale cerise filaments and
golden yellow anthers, the longest to about 12 mm long;
Fruit: Small, round, greenish to brown, ca 5 mm in diameter,
dehiscent by a longitudinal slit
Seed: 1.1 mm long, tuberculate, black.
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Cultivation: It’s quite
prone to rot, especially after the first flowering. Needs a well-drained
soil. Watering should be rather infrequent, but abundant, so that the
soil becomes completely soaked. The fact that the plant retracts into
the soil, and assumes a grey-green colouring between waterings, is
perfectly natural and doesn’t cause any damage. Keep dry in winter or
when night temperatures remain below 10° C. It is hardy to -4°C for a
short period. Assure a good ventilation. Exposure: Full sun where it
obtains a flat natural looking aspect, or part sun. |
Cultivation and Mail Sale 
