Genus Dendrobium section Diplocaulobium subsection Diplocaulobium

Genus Dendrobium section Diplocaulobium subsection Diplocaulobium

Genus Dendrobium Sw. sect. Diplocaulobium Rchb.f. subsect. Diplocaulobium. Type species: Dendrobium nitidissimum Rchb.f.


  • Diplocaulobium (Rchb.f.) Kränzl. in Engl., Pflanzenr. IV. 50. II. B. 21 (1910) 331.
  • Diplocaulobium (Rchb.f.) Kränzl. in Engl., Pflanzenr. IV. 50. II. B. 21 (1910) 331..

Sympodial epiphytic plants. Pseudobulbs consisting of one internode, either clustered and often elongated with a more or less abruptly swollen basal part, or spaced along an elongate, creeping or pendulous rhizome, 1-leaved at the apex . Leaves glabrous, dorso-ventrally flattened, articulate, duplicate, leathery; base without leafsheath. Inflorescence 1-flowered, terminal, often in fascicles from the apex of the pseudobulb, from a bilaterally flattened, long-persistent, yellow spathe, Flowers medium-sized to large, resupinate, mobile, lasting less than 1 day or rarely lasting a few days, in most species with white sepals or petals which often turni reddish-purple when they start wilting, but also with various other colours. Sepals free; mentum chin-like. Lip mobile on the apex of the column foot, entire or 3-lobed, without spur; at least the hypochile with swollen keels. Column-foot present. Pollinia 4, solid-waxy, caudicles absent, stipe absent, viscidium absent.

Malaysia, Singapore, Brunei, the Philippines, Indonesia, Papua New Guinea, Australia, Solomon islands, east to Samoa. About 90 species; in New Guinea 77 species.

Epiphytes in lowland and montane forest, predominantly below 2000 m.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Dendrobieae
  • Subtribe Dendrobiinae
  • Genus Dendrobium
  • Section Diplocaulobium
  • Subsection Diplocaulobium
  • Brieger, F.G. 1981. Dendrobiinae. In Schlechter, Die Orchideen, ed. 3, I/A: 636-752.
  • Kraenzlin, F. 1910. Orchidaceae-Monandrae-Dendrobiinae I. In: A. Engler, Das Pflanzenreich, IV.50.II.B.21.
  • Lavarack, B., W. Harris & G. Stocker. 2000. Dendrobium and its relatives. Timber Press, Portland, Oregon.
  • Morris, M.W., W.L. Stern, and W.S. Judd. 1996. Vegetative anatomy and systematics of subtribe Dendrobiinae (Orchidaceae). Bot. J. Linn. Soc. 120: 89-144.
  • O'Byrne, P. 1994. Lowland orchids of Papua New Guinea. SNP Publishers, Singapore.
  • Schlechter, R. 1905. Microspermae. In Schumann, K. and K. Lauterbach, Nachträge zur Flora der Deutschen Schutzgebiete in der Südsee. pp. 69-234, pl. III-XII.
  • Schlechter, R. 1911-1914. Die Orchidaceen von Deutsch-Neu-Guinea. Rep. Spec. Nov. Regni Veg. Beih. 1: 1-1079.
  • Schlechter, R. 1923 & 1928. Figurenatlas zu den Orchidaceen von Deutsch-Neu-Guinea. Rep. Spec. Nov. Regni Veg. Beih. 21 (1 & 2).
  • Schlechter, R. 1982. The Orchidaceae of German New Guinea, incorporating the figure atlas to the above. The Australian Orchid Foundation, Melbourne.
  • (English translation of Schlechter 1911-1914)
  • Smith, J.J. 1909. Die Orchideen von Niederländisch-Neu-Guinea. Nova Guinea 8(1): 1-148.
  • Smith, J.J. 1911. Die Orchideen von Niederländisch-Neu-Guinea. Nova Guinea 8(3): 521-611.
  • Smith, J.J. 1913. Die Orchideen von Niederländisch-Neu-Guinea. Nova Guinea 12(1): 1-108.
  • Smith, J.J. 1915 & 1916. Die Orchideen von Niederländisch-Neu-Guinea. Nova Guinea 12(3): 173-272 & 12(4): 273-477.
  • Smith, J.J. 1929. Orchidaceae. Nova Guinea 14(3): 337-516.
  • Smith, J.J. 1935. Orchidaceae. Nova Guinea 18(1): 9-85.
  • van Bodegom, J. 1973. Enige orchideeën van West Nieuw Guinea. Technische Hogeschool Twente.
  • Yukawa, T. and K. Uehara. 1996. Vegetative diversification and radiation in subtribe Dendrobiinae (Orchidaceae): evidence from chloroplast DNA phylogeny and anatomical characters. Pl. Syst. Evol. 201: 1-14.
  • Yukawa, T., S. Kurita, M. Nishida, and M. Hasebe. 1993. Phylogenetic implications of chloroplast DNA restriction site variation in subtribe Dendrobiinae (Orchidaceae). Lindleyana 8: 211-221.
  • Yukawa, T., H. Ohba, K. M. Cameron, and M.W. Chase. 1996. Chloroplast DNA phylogeny of subtribe Dendrobiinae (Orchidaceae): Insights from a combined analysis based on rbcL sequences and restriction site variation. J. Plant Res. 109: 169-176.

Dendrobium section Diplocaulobium is a fairly uniform section with 1-leaved, usually more or less bottle shaped pseudobulbs which are swollen at the base and (very) narrow in the top part but without a widened collar at the very tip, carrying 1-flowered inflorescences at their apex; in few species (including the type species of the section) the pseudobulbs are dimorph, the short ones are always sterile and the long ones are fertile. The short-lived flowers are mainly borne on pseudobulbs of similar size, sometimes on the long pseudobulbs only, mainly white with a variously coloured lip, often turning reddish-pinkish when they start wilting. Sepals and petals mostly very narrow, long caudate. Lip almost always with a dome-shaped longitudinal papillose callus, usually with 2 keels..

Dendrobium section Diplocaulobium contains c. xx species, in New Guinea c. 36 species:

Dendrobium abbreviatum
Dendrobium ajoebii
Dendrobium angustitepalum
Dendrobium arachnoideum
Dendrobium araneola
Dendrobium aratriferum
Dendrobium bidentiferum
Dendrobium cervicaliferum
Dendrobium ditschiense
Dendrobium fariniferum
Dendrobium franssenianum
Dendrobium gibbiferum
Dendrobium gracilentum
Dendrobium gracilicolle
Dendrobium guttulatum
Dendrobium hydrophilum
Dendrobium ischnophyton
Dendrobium lageniforme
Dendrobium lewisiae
Dendrobium mamberamense
Dendrobium mischobulbum
Dendrobium nitidissimum
Dendrobium obyrnei
Dendrobium opilionites
Dendrobium pentanema
Dendrobium phalangillum
Dendrobium phalangium
Dendrobium pililobum
Dendrobium platyclinoides
Dendrobium pulvilliferum
Dendrobium recurvifolium
Dendrobium schouteniense
Dendrobium scotiiforme
Dendrobium shearmanii
Dendrobium validicolle
Dendrobium vanleeuwenii

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