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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.
Photo of conspecific taxa, varieties,
forms and cultivars of plants
belonging to the
Escobaria tubercolsa
complex
(This
Taxon
has lots of synonyms whit
several controversial varieties and subspecies and comprises a multitude
of different forms, but where each form is linked to others by
populations of plants with intermediate
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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.
Propagation: Seeds (no
dormancy requirement, they
germinate best at 25°C in spring ) or usually by
offsets (readily
available),
or occasionally
grafted.
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Conservation status:
Listed in
CITES appendix 2
Scientific name:
Escobaria tuberculosa (Engelm.) Britton &
Rose
Cact. 4: 54, fig. 51. 1923. Mammillaria tuberculosa Engelm., Proc.
Amer. Acad. Arts and Sci. 3: 268. 1856.
Type locality: LT - Mexico:
Chihuahua: Flounce Mountains, below El Paso, below San Elisario on the
Río Grande.
Type specimen: LT: MO. Bigelow s.n.,
Jun 1852. The LT was designated by Benson, Cact. U.S. Canada 962 (1982),
but specific sheet is not indicated.
Common English Name: Cob
corycactus, Incense Corycactus, white column foxtail cactus, white-column
foxtail cactus
Origin: Southeastern
Arizona, southern New Mexico and Trans-Pecos Texas south into northern
Mexico (Coahuila, Chihuahua, and Durango).
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Synonyms:
- Coryphantha
dasyacantha var. varicolor (Tiegel) L.Benson
- Coryphantha
strobiliformis auct. non (Poselg.) Orcutt [misapplied]
- Coryphantha
dasyacantha var. varicolor (Tiegel) L. Benson
- Coryphantha
strobiliformis auct. non (Poselg.) Orcutt
- Coryphantha tuberculosa Marshall
- Escobaria dasyacantha var. varicolor
(Tiegel)
D.R. Hunt
- Escobaria
strobiliformis auct. non (Poselg.) Scheer ex Bödecker
[misapplied]
- Escobaria
tuberculosa var. varicolor (Tiegel) Brack & Heil
- Escobaria
dasyacantha var. varicolor (Tiegel) D.R. Hunt
- Mammillaria
tuberculosa Engelm
- Mammillaria
varicolor (Tiegel) Weniger
- Mammillaria
tuberculosa Engelm.
- Cactus tuberculosa Kuntz
- Cactus
strobiliformis Kuntz
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