Dendrobieae

Dendrobieae is a tribe in the subfamily Epidendroideae, in the family Orchidaceae.[1]

Dendrobieae
Dendrobium dearei
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Tribe: Dendrobieae
Lindl. ex Endl.
Subtribes

The Dendrobieae are mostly tropical, epiphytic orchids which contain pseudobulbs.

A few species in this tribe, such as Dendrobium and Bulbophyllum, are strongly favored by orchid growers.

Features

Dendrobieae are mostly small, epiphytic orchids. The roots are covered by velamen. There are usually pseudobulbs present, with leaves at the top; sometimes the species lacks pseudobulbs and the leaves are spread across the stem or the plant is leafless.

The flowers are terminal or axillary and spread across the stalk. The gynostemium is firm, with a clear foot. The anther is bent. The two or four pollinia are naked, they contain no viscidium, just like the Malaxideae.

Distribution

Dendrobieae have a pantropical distribution.

Taxonomy

Taxonomy according to Dressler, Cameron and van den Berg

The taxonomy of Dendrobieae is still under discussion. The group has been described with the composition below by Dressler (1993),[2] but appears to be a polyphyletic group. This was investigated by Cameron et al. (1999)[3] and van den Berg et al. (2000).[4] However, they moved the genus Pseuderia to the tribe Podochileae. As a result, the tribe contained two subtribes, 27 genera and about 3,000 species.

Dendrobieae ' s phylogenetics can be seen below:

Epidendroideae

Arethuseae, Epidendreae

Podochileae

Malaxideae

Dendrobieae
Dendrobiinae

Epigeneium

Bulbophyllinae

Bulbophyllum

Dendrobiinae

Cadetia

Dendrobium

Flickingeria

Diplocaulobium

Dendrobium

Calypsoeae, Epidendreae, Vandeae, Cymbidieae

Taxonomy according to Clements

In various studies in 2003[5] and 2006[6] based on DNA analysis, Clements called for a review of Dendrobieae to be placed in the more monophyletic groups. Thus Bulbophyllinae was positioned earlier while Podochileae in its original position.

He placed the genus Epigeneium in a separate monophyletic subtribe, Epigeneiinae, after Dendrobieae. The genus Dendrobium is split further: The species of the section Oxystophyllum were placed under Podochileae, the Australasian Dendrobium-species were split into a new set of genera in the Grastidiinae subtribe.

The Dendrobiinae subtribe then contained the genus Dendrobium which includes the Asiatic species of the former giant genus, totalling over 450 species, and several genera separated from it.

Based on his Dendrobium research, it was found that in the future, even more monphyletic groups could be identified in the future as separate genera.

The pedigree chart of Dendrobieae can be found below:

Epidendroideae

Arethuseae, Epidendreae

Podochileae (+Bulbophyllinae), Malaxideae

Dendrobieae

Epigeneiinae

Grastidiinae

Dendrobiinae

Calypsoeae, Epidendreae, Vandeae, Cymbidieae

References

Further reading

  • Lindley, J. (1837) Genera Plantarum 190.
  • Dressler, R.L. (1993) Phylogeny And Classification Of The Orchid Family, Cambridge, Cambridge University Press.
  • Chase, M.W., Cameron, K.M., Barrett, R.L. & Freudenstein, J.V. (2003). DNA data and Orchidaceae systematics: a new phylogenetic classification. pp. 69–89, in Dixon, K. M., S. P. Kell, R. L. Barrett, and P. J. Cribb [eds]. Orchid conservation. Natural History Publications, Kota Kinabalu, Sabah, Malaysia.
  • Chase, M.W. (2005) Classification of Orchidaceae in the Age of DNA data, Curtis's Botanical Magazine, Volume 22 (1): 2–7.
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