Grammatophyllum speciosum, also called giant orchid, tiger orchid, sugar cane orchid or queen of the orchids, is the world's largest orchid.
It is an epiphytic and occasionally a lithophytic plant, forming spectacular root bundles. Its cylindric pseudobulbs can grow to a length of 2.5 m. It can grow to gigantic clusters weighing from several hundred kilograms to more than one ton.
Each raceme can grow to a height of 3m, bearing up to eighty flowers, each 10 cm wide. The flowers are yellow colored with maroon or dark red spots. These flowers are remarkable, since the lowest flowers have no lip and these flowers function as osmophores for the entire inflorescence and continue to emit chemical scent to attract pollinators as flowers open in succession. It blooms only once every two to four years. This orchid can, however, remain in bloom for up to two months.
- Giant orchid, not to be confused with Pteroglossaspis ecristata (Fernald) Rolfe  or Barlia robertiana, both of which are also commonly called the giant orchid.
- Tiger orchid, not to be confused with Rossioglossum grande or Maxillaria species, both are also called tiger orchid.
- Queen of the orchids, not to be confused with Cattleya species
- Sugar cane orchid, for its resemblance to a sugarcane plant of the genus Saccharum
Distribution and habitat
Because of its enormous size, it is rarely cultivated as this species is usually too large to be accommodated in most greenhouses. Cultivated specimens of this species are always grown as terrestrials, as the plants grow as both an epiphyte and terrestrial in habitat.
- Nancy Laws (2009) Orchid Breeding at Singapore Botanic Gardens Orchid Magazine
- Grammatophyllum speciosum Blume 1825 in The Internet Orchid Species Photo Encyclopedia at orchidspecies.com
- Illustrated Encyclopedia of Orchids ISBN 0-88192-267-6
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