Disocactus speciosus, the sun cactus, is a species of flowering plant in the family Cactaceae. It is native to Mexico, Honduras and Guatemala, and has been introduced to the Canary Islands. As its synonym Heliocereus speciosus it has gained the Royal Horticultural Society's Award of Garden Merit.
Subtaxa The following subspecies are accepted: Disocactus speciosus subsp. blomianus (Kimnach) Ralf Bauer – Chiapas Disocactus speciosus subsp. cinnabarinus (Eichlam ex Weing.) Ralf Bauer – southern Mexico, Honduras Disocactus speciosus subsp. heterodoxus (Standl. & Steyerm.) M.Á.Cruz & S.Arias – Guatemala Disocactus speciosus subsp. speciosus
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