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Disocactus × hybridus
''Disocactus'' × ''hybridus'' is a hybrid between ''Disocactus phyllanthoides'' and ''Disocactus speciosus''. It is perhaps the most commonly grown Orchid Cactus and seems to survive and flower under most conditions. It has a very complex taxonomic history and has been mistaken for ''Disocactus ackermannii'' for a long time. The name ''Cactus jenkinsonii'' McIntosh (1829) might be an older name, but there is no combination under ''Disocactus''.
==History==
In 1824, George Ackermann brought a part of a stem with him from Mexico and gave that to Tate who succeeded in flowering the specimen. Another specimen raised from Mexican seeds confirmed that this was really a novelty from Mexico and not a hybrid. The species was soon lost in cultivation. During the latter half of the 19th century, when cacti gave away to ferns, palms and orchids, only the toughest survived and as ''D. ackermannii'' is quite tricky it soon became lost in cultivation. About the same time some gardener succeeded in crossing ''D. phyllanthoides'' and ''D. speciosus'' producing a lovely red flowered hybrid. Being a vigorous, hardy, free-flowering plant, almost impossible to kill, it survived in collections. Unfortunately it was confused with the true ''D. ackermannii'' so when Britton and Rose published ''The Cactaceae'', the switch had been made and the true species was forgotten. What Britton and Rose describe under ''Epiphyllum ackermanni'' is the hybrid, not the species. In 1943, Charles Gilles rediscovered the species in high, nearly unclimbable trees near Jalapa. He managed to collect living material and it was soon evident that the plant in cultivation was not the plant of Haworth. This hybrid is today correctly referred to as ''Disocactus'' × ''hybridus'' 'Ackermannii'.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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