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E. tuberculosa (SB79 Jimenez, Chihuahua, Mexico)
Description: Branched and small stemmed (to 50 branches) but
sometimes solitary and large stemmed. Stems ovoid to cylindric up to 12 (18) cm
tall, 7 cm in diameter. Tubercles are more or less regularly arranged in
spirals, and firm; areolar glands are absent. Spines 21-41 per areole,
ashy white, grey, or pale tan in colour, with the tips of the largest
spines reddish brown or reddish black, all straight. Radial spines
numerous (15-41 per areole), 4-15 mm long, grey to white, sometimes as
many as 30. Central spines several, stouter than radials, brown to
blackish or colored only at tips
The flowers are apical or nearly so, pure white, pale rose-pink, or pale
lavender-pink, darker centrally, 2.5 to 4 cm in diameter. The fruit is
oblong, bright red not very succulent; the floral remnant is strongly
persistent.
Cultivation:
Easy to cultivate in a very gritty substrate
with much drainage. Water regularly in summer, but do not overwater
(very rot prone), it prefer a completely
dry place during winter . An unheated greenhoouse
would be perfect. It can survive low temperatures (appr. -12 C).
Full sun to light shade
Photo of conspecific taxa, varieties,
forms and cultivars:
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Cultivation
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