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ACANTHOCALYCIUM

GENUS ACANTHOCALYCIUM
Subfamilia Cactoideae, tribus Trichocereae
Acanthocalycium spiniflorum is the type species of the genus. Acanthocalycium distribution is in Argentina.
Curt Beckeberg (1935) described nine species for the genus Acanthocalycium, most previously included in Echinopsis.
The name comes from the Greek, akantha, prickly and kalyx, thus referring the spiny buds.
The species of the genus Acanthocalycium has been included or excluded in & out to the genus Echinopsis several times. Nowadays, they heve been lumped to the Echinopsis totaly by International Cactaceae Systematics group, (The New Cactus Lexicon, 2006).
I display them separately in this album, cause the broadly based genus Echinopsis is apparently polyphletic.
Plants' stems are usually solitary, globose to somewhat elongate, very spiny, 10-15 cm in diameter with many ribs. Diurnal pink to white to red flowers are funnelform or bell shaped, to 4 cm long.
Here, my Acanthocalycium naming partly follow the older classifications and in part with the help of Anderson's monumental book, The Cactus Family, 2001.
As to this book, there are 3 species in the genus Acanthocalycium: A.ferrari/syn. A.variiflorum (Beckeberg), A.klimpelianum (Beckeberg), A.spiniflorum (Beckeberg).
In older classifications, there are 6 main species: A.catamarcense, A.glaucum, A.klimpelianum (Beckeberg), A.peitscherianum (Beckeberg), A.spiniflorum (Beckeberg), A.violaceum (Beckeberg), and varieties/forms of the previous ones: A.auranthiacum, A.brevispinum, A.chionanthum, A.griseum.
I cited their accepted names and synonymes as to The New Cactus Lexicon (2006), in the captions.

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1
01 Acanthocalycium violaceum P110a
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2
Acanthocalycium ferrarii 01
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3
Acanthocalycium ferrarii 02
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4
Acanthocalycium ferrarii 03
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5
Acanthocalycium glaucum 01
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6
Acanthocalycium glaucum 02
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7
Acanthocalycium glaucum 05
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8
Acanthocalycium glaucum 06
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9
Acanthocalycium glaucum 07
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10
Acanthocalycium glaucum 11
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11
Acanthocalycium glaucum P143 02
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12
Acanthocalycium glaucum P143 04
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13
Acanthocalycium klimpelianum 01
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14
Acanthocalycium klimpelianum 02
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15
Acanthocalycium klimpelianum 04
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16
Acanthocalycium klimpelianum 05
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17
Acanthocalycium klimpelianum 06
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18
Acanthocalycium klimpelianum 09
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19
Acanthocalycium klimpelianum 10
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20
Acanthocalycium thionanthum 'chionan…
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21
Acanthocalycium thionanthum 'chionan…
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22
Acanthocalycium thionanthum 'chionan…
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23
Acanthocalycium thionanthum P144 01
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24
Acanthocalycium thionanthum P144 02
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25
Acanthocalycium thionanthum P144 03
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26
Acanthocalycium violaceum P110a 01
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27
Acanthocalycium violaceum P110a 02
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28
Acanthocalycium violaceum P110a 04
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29
Acanthocalycium violaceum P110a 05
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30
Acanthocalycium violaceum P110a 06
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31
Acanthocalycium violaceum P110a 07
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