Mattslandscape.com says;
Species-SELENICEREUS CONIFLORUS- Has a Large nocturnal (night blooming) Flower in white with gold back petals. The growth is rope like and the bloom and growth only differs slightly from The following varieties, which should all probably be reduced to varieties or synonyms of S. grandiflorus, as their stems and flowers differ only slightly: S. urbanianus, S. coniflorus, S. hondurensis, S. pteranthus, S. kunthianus, S. brevispinus, S. boeckmannii, S. macdonaldii, S. rothii. SELENICEREUS CONIFLORUS-Has stem growth more cylintrical and is not as thick as S.Grandiflorus but otherwise is very simular. Requires the same growing culture as Hybrid Epiphyllums, a few hours of direct sunlight required to bloom well. Blooms from late July to September in Southern California,U.S.A. climate-coastal region. This variety was first discovered/published in Mexico-1904. THE PLANTS OR CUTTINGS OFFERED HERE WERE GARDEN CULTIVATED AND WERE NOT REMOVED FROM THERE NATIVE HABITAT.