Epiphyllum hybrid

'Wendy'

Epiphyllum hybrids, epiphyllums, epicacti, or just epis, also known as orchid cacti, which are widely grown for their flowers, are artificial hybrids derived primarily from species of the genus Disocactus.[1] These Disocactus species are not true epiphyllums, but they used to be included in the genus Epiphyllum.

Parental species

Epiphyllum hybrids are mostly derived from one or more of the following species:[1][2]

Some cacti in the tribe Hylocereeae other than Disocactus have been crossed with species or hybrids of Disocactus, but not all the derived hybrids are considered epiphyllum hybrids. For example, × Disoselenicereus fulgidus (Disocactus speciosus × Selenicereus pteranthus) and × Aporodisocactus mallisonii (Aporocactus flagelliformis × Disocactus speciosus) are too morphologically dissimilar to Epiphyllum to be called "epiphyllum hybrids".

The following are some species reported to be used in intergeneric crosses to breed epiphyllum hybrids:

The following reports on intergeneric epiphyllum hybrids are either dubious or false:

  • × Epinicereus cooperi is alleged to be a hybrid between Disocactus crenatus and Selenicereus grandiflorus, but it turns out that this plant is not of hybrid origin,[6] and it should be correctly referred to as Disocactus crenatus subsp. kimnachii 'Cooperi'.[7]
  • × Disoselenicereus wrayae is also considered to be a hybrid between Disocactus crenatus and Selenicereus grandiflorus, but Myron William Kimnach supposes it is just a variant of Disocactus crenatus subsp. crenatus as he tried to reproduce the cross but failed.[8]
  • A plant called Epiphyllum splendidus was crossed with Disocactus crenatus by Hovey & Co. of Boston in about 1870,[9][10] but the so-called "Epiphyllum" is actually a reddish-flowered form of Disocactus.[10]
  • Edward Frederick Anderson thinks Pseudorhipsalis spp. are in the parentage of epiphyllum hybrids.[11] However, the only "Pseudorhipsalis sp." known as a breeding parent of epiphyllum hybrids is Disocactus macranthus (= Pseudorhipsalis macrantha).

Named nothospecies

History

The parent species from which epiphyllum hybrids were bred are different in appearance and habit from most cacti. They are found in the tropical forests of Central America where they grow as climbers or on trees as epiphytes. They have leafless (or apparently leafless) flattened stems which act as the plant's photosynthetic organs. Relatively large flowers are borne on the sides of the stems; in many species they open at night.[15] Thousands of cultivated hybrids have been created, often with the intention of increasing the size and colour range of their flowers, which average 13–20 cm (5–8 in) across, although the largest can reach 38 cm (15 in).[16]

The Epiphyllum Society of America (the International Registration Authority for hybrids of the Tribe Hylocereeae) maintains a list of epiphyllum hybrids (and Hylocereeae species) which contained over 7,000 names in 1996.[17]

Cultivation

Floral buds of an epiphyllum hybrid

Epiphyllum hybrids need different treatment from semi-desert cacti. They should be protected from direct sunlight, with preferably 75% shading at midday. They are not frost hardy, so need to be protected from freezing conditions. It is recommended that the growing medium allows rapid drainage of water and is open, with at least one third of coarse material to prevent compaction. Plants should be kept moist. High nitrogen fertilizers are not recommended; no fertilizer should be given during the winter rest period.[18][19]

Epiphyllum hybrids can be propagated from cuttings. Rooting hormone can be applied to the base of the cutting before it is allowed to dry for ten days or more so that the cut forms a callus. The cutting is then planted sufficiently deeply so that it can stand upright. Water is not given for two weeks, after which the growing medium is kept at least slightly moist. Plants can be misted. They are fast growing plants and should flower within two years. Epiphyllum hybrids should be re-potted every 2 to 3 years as they tend to sour and deplete the nutrients in their growing medium. Because the plants are aggressive and grow quickly, they are susceptible to depleting the potassium in their growing medium which results in older growth failing to remain turgid and shriveling. They should be provided a balanced fertilizer when in active growth to prevent the older growth from shriveling. Flowering is triggered by withholding water and giving the plants a dry resting period of about two months during their winter rest.[20][18][19]

Flower variation in epiphyllum hybrids
'Helmut Oetken'
'George French'
'King Midas'
'Unforgettable'

References

  1. ^ a b c Süpplie, Frank (1997). "Epiphyllum hybrids: Some old, some new". British Cactus & Succulent Journal. 15 (2): 58–66. ISSN 0264-3405. JSTOR 42793469.
  2. ^ a b c d e f g Van der Meer, M. H. J. (2018-12-31). "16 new nothogenera and 15 new combinations in Hylocereeae (Cactaceae)". Cactologia Phantastica. 1: 1–16.
  3. ^ "Frank Süpplie Epiphyllum hybriden". E.P.R.I.C. Retrieved 2023-06-28.
  4. ^ Van der Meer, Maarten H.J. (2022-01-25). Differa 'Naranja'". Dictionary of Cactus Names. Retrieved 2023-06-28.
  5. ^ Van der Meer, Maarten H.J. (2020-11-12). Differa 'Inca's Golden Dream'". Dictionary of Cactus Names. Retrieved 2023-06-28.
  6. ^ Metz, Matthew A.; Froblich, Michael W.; Kimnach, Myron; Meyerowitz, Elliot M. (1997). "The hybrid origin of ×Epinicereus cooperi (Cactaceae) refuted using gel blot hybridization of random amplified polymorphic DNAs". Haseltonia. 5: 61–71.
  7. ^ Van der Meer, Maarten H.J. (2020-11-06). "Disocactus crenatus subsp. kimnachii 'Cooperi'". Dictionary of Cactus Names. Retrieved 2023-06-28.
  8. ^ Heath, P. V. (1989). "The saga of ×Seleniphyllum (Cactaceae)". Taxon. 38 (1): 148–150. doi:10.2307/1220922. ISSN 0040-0262. JSTOR 1220922.
  9. ^ Worsley, A. (1907). "Hybrids among the Amarylliae and Cactaceae, with some notes on variation in the Gesneriaceae and the genus Senecio". In Wilks, W. (ed.). Report of the Third International Conference 1906 on Genetics. London: Spottiswoode & Co. p. 407.
  10. ^ a b Castle, Lewis (1884). Cactaceous Plants: Their History and Culture. London: The Horticultural Press. p. 60.
  11. ^ Anderson, Edward F. (2001), The Cactus Family, Pentland, Oregon: Timber Press, ISBN 978-0-88192-498-5, p. 286
  12. ^ Meier, Eckhard (2006-11-11). "Einige Neukombinationen von Hybridgattungen und Hybridspezies der Hylocereeae". EPIG. 57: 15–17.
  13. ^ Rowley, Gordon Douglas (1987). "Face to Face: Gordon Rowley comments". British Cactus & Succulent Journal. 5 (3): 83–84. ISSN 0264-3405. JSTOR 42792482.
  14. ^ Cruz, Miguel Ángel; Arias, Salvador; Terrazas, Teresa (2016-04-01). "Molecular phylogeny and taxonomy of the genus Disocactus (Cactaceae), based on the DNA sequences of six chloroplast markers". Willdenowia. 46 (1): 145–164. doi:10.3372/wi.46.46112. ISSN 0511-9618. S2CID 87086656.
  15. ^ Anderson 2001, p. 101.
  16. ^ Hewitt, Terry (1998), The complete book of cacti & succulents, London: Covent Garden Books, p. 73, ISBN 978-1-85605-402-7
  17. ^ "Registry - Epiphyllum Society of America". www.epiphyllums.org.
  18. ^ a b "Cultural Information - Epiphyllum Society of America". www.epiphyllums.org.
  19. ^ a b "The 'Bulletin' - Epiphyllum Society of America". www.epiphyllums.org.
  20. ^ "Help! Whats wrong with my Epiphyllum? - CactiGuide.com". cactiguide.com.

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