Cavendish bananas are the fruits of one of a number of banana cultivars belonging to the Cavendish subgroup of the AAA banana cultivar group. The same term is also used to describe the plants on which the bananas grow. They include commercially important cultivars like 'Dwarf Cavendish' (1888) and 'Grand Nain' (the "Chiquita banana"). Since the 1950s, these cultivars have been the most internationally traded bananas. They replaced the Gros Michel banana (commonly known as Kampala banana in Kenya and Bogoya in Uganda) after it was devastated by Panama disease. They are unable to reproduce sexually, instead being propagated via identical clones. Due to this, the genetic diversity of the Cavendish banana is very low. Combined with the fact the Cavendish is planted in dense chunks in a monoculture without other natural species to serve as a buffer, this means the Cavendish is extremely vulnerable to disease, fungal outbreaks, and genetic mutation, possibly leading to eventual commercial extinction. Cavendish bananas were named after William Cavendish, 6th Duke of Devonshire. Though they were not the first known banana specimens in Europe, in around 1834 Cavendish received a shipment of bananas (from Mauritius) courtesy of the chaplain of Alton Towers (then the seat of the Earls of Shrewsbury). His head gardener and friend, Sir Joseph Paxton, cultivated them in the greenhouses of Chatsworth House. The plants were botanically described by Paxton as Musa cavendishii, after the Duke. For his work Paxton won a medal at the 1835 Royal Horticultural Society show. The Chatsworth bananas were shipped off to various places in the Pacific around the 1850s. It is believed that some of them may have ended up in the Canary Islands, though other authors believe that the bananas in the Canary Islands had been there since the fifteenth century and had been introduced through other means, namely by early Portuguese explorers who obtained them from West Africa and were later responsible for spreading them to the Caribbean.