Disocactus × jenkinsonii

Disocactus × jenkinsonii 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.

Disocactus × jenkinsonii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Genus:	Disocactus
Species:	D. × jenkinsonii
Binomial name
Disocactus × jenkinsonii (McIntosh) M.H.J.van der Meer
Synonyms
Cactus × hybridus Van Geel Cactus × jenkinsonii McIntosh Cactus speciosissimus var. lateritius Lindl. Disocactus × hybridus (Van Geel) Barthlott Epiphyllum × vandesii G.Don × Heliochia hybrida (Van Geel) P.V.Heath × Heliochia jenkinsonii (McIntosh) P.V.Heath Phyllocactus × franzii Hildm. Phyllocactus × ignescens Haage Phyllocactus × triumphans Serner

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 × jenkinsonii 'Ackermannii'.

Description

The stems are flat to triangular, often quite thick and succulent. The flowers are more or less funnel shaped, usually orange to red. The stigma lobes are white, never lavender.

Cultivars

This cross has been remade many times creating several cultivars. However, many of them are confused today and cannot be identified.

See also

• Epiphyllum hybrid