Heliocereus
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Heliocereus speciosus v. amecamensis
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Heliocereus_amecamensis
Photo by Ulf Eliasson 
syn Disocactus speciosus (cav.) Britton & Rose
Rooted cutting
Keep above 50°F (10°C). Occasionally epiphytic, much branched, erect at first, stems reddish at first and then dark red.