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Description: The stem is a
bluish-green sphere that elongate with age, with white-woolly depressed
apex;. There are about 35 slender ribs with sharp, undulating edges,
depressed at 1.5 cm intervals where areoles appear.
Spines: There are about 10 to 25 bristle-like, silky, almost
transparent radial spines, 1 cm. long, whitish to cream-colored and
partially erect; from one to three may be missing from upper areoles.
The four central spines are much thicker, longer, and usually darker
yellow to tan coloured : they are straight except for the uppermost one,
which is may reach 5 cm of length, flat, and often curved backward.
Flowers: Small funnel-shaped 2 cm long with yellow (or whitish), lanceolate perianth segments.
Cultivation: It needs very drained soil and less watering than
normal for the genus. Propagation: Seeds (usually) or by the shoots of
adult plants (if available). Exposure: Full sun to light shade, Frost
Tolerance -5°C if kept dry.
It tillers more readily than most other species.
Conspecific taxa, varieties, forms an cultivars:
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Cultivation and
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