Genus Dendrobium section Diplocaulobium

Genus Dendrobium section Diplocaulobium

Genus Dendrobium sect. Diplocaulobium Rchb.f., J. Linn. Soc. 15 (1876) 112. Type species: Dendrobium nitidissimum Rchb.f.

Synonyms:

  • Diplocaulobium (Rchb.f.) Kränzl. in Engl., Pflanzenr. IV. 50. II. B. 21 (1910) 331. Type species: Diplocaulobium nitidissimum (Rchb.f.) Kränzl. (basionym: Dendrobium nitidissimum Rchb.f.).
  • Genus Dendrobium sect. Longicollia J.J.Sm., Orchid Ambon (1905) 39, nom. invalid. Type species: Dendrobium longicolle Lindl.
  • Genus Dendrobium sect. Mekynosepalum Schltr. in K.Schum. & Lauterb., Nachtr. Fl. Deutsch. Schutzgeb. Südsee (1905)149. Type species: Dendrobium mekynosepalum Schltr.
  • Diplocaulobium (Rchb.f.) Kränzl. in Engl., Pflanzenr. IV. 50. II. B. 21 (1910) 331. Type species: Diplocaulobium nitidissimum (Rchb.f.) Kränzl. (basionym: Dendrobium nitidissimum Rchb.f.).
  • Diplocaulobium sect. Goniobulbon (Schltr.) Brieger in Schltr. Orchideen ed. 3, 1 (1981) 735, nom. illeg. Type species: Diplocaulobium chrysotropis (Schltr.) A.D.Hawkes (basionym: Dendrobium chrysotropis Schltr.).
  • Genus Dendrobium sect. Goniobulbon Schltr. in K.Schum. & Lauterb., Nachtr. Fl. Deutsch. Schutzgeb. Südsee (1905)149. Type species: Dendrobium chrysotropis Schltr.
  • Diplocaulobium sect. Goniobulbon (Schltr.) Brieger in Schltr. Orchideen ed. 3, 1 (1981) 735, nom. illeg. Type species: Diplocaulobium chrysotropis (Schltr.) A.D.Hawkes (basionym: Dendrobium chrysotropis Schltr.).

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.

  • 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 one-leaved, often bottle shaped pseudobulbs carrying one-flowered inflorescences at their apex. The usually short-lived flowers are mainly white (often turning reddish-purple when they start wilting), with mostly very narrow, pointed sepals and petals. A few species deviate in that they have more substantial flowers with attractive colours, such as Dendrobium regale Schltr., Dendrobium auricolor J.J.Sm. and Dendrobium centrale J.J.Sm.. These rank among the finest orchids of New Guinea.

In New Guinea Dendrobium section Diplocaulobium contains the following 77 species:

Dendrobium abbreviatum
Dendrobium ajoebii
Dendrobium angustitepalum
Dendrobium arachnoideum
Dendrobium araneola
Dendrobium aratriferum
Dendrobium auricolor
Dendrobium bidentiferum
Dendrobium cadetioides
Dendrobium carinulatidiscum
Dendrobium centrale
Dendrobium cervicaliferum
Dendrobium chrysotropis
Dendrobium connexicostatum
Dendrobium coplandii
Dendrobium crenulatum
Dendrobium cyclobulbon
Dendrobium dichrotropis
Dendrobium dilatatocolle
Dendrobium ditschiense
Dendrobium fariniferum
Dendrobium franssenianum
Dendrobium gibbiferum
Dendrobium glabrum
Dendrobium gracilentum
Dendrobium gracilicolle
Dendrobium guttulatum
Dendrobium humilicolle
Dendrobium hydrophilum
Dendrobium iboense
Dendrobium inauditum
Dendrobium inconstans
Dendrobium ischnopetalum
Dendrobium ischnophyton
Dendrobium isthmiferum
Dendrobium jadunae
Dendrobium janowskyi
Dendrobium kirchianum
Dendrobium lageniforme
Dendrobium lewisiae
Dendrobium longicolle
Dendrobium mamberamense
Dendrobium mekynosepalum
Dendrobium minjemense
Dendrobium mischobulbum
Dendrobium nitidissimum
Dendrobium obyrnei
Dendrobium opilionites
Dendrobium pentanema
Dendrobium phalangillum
Dendrobium phalangium
Dendrobium pililobum
Dendrobium platyclinoides
Dendrobium pleurothalloides
Dendrobium pulvilliferum
Dendrobium recurvifolium
Dendrobium regale
Dendrobium ridleyanum
Dendrobium savannicola
Dendrobium schouteniense
Dendrobium scotiiforme
Dendrobium sepikanum
Dendrobium shearmanii
Dendrobium sitanalae
Dendrobium stelliferum
Dendrobium sublobatum
Dendrobium tentaculatum
Dendrobium tipula
Dendrobium tortitepalum
Dendrobium tropidophorum
Dendrobium tuberculatum
Dendrobium validicolle
Dendrobium vanilliodorum
Dendrobium vanleeuwenii
Dendrobium wantipiense
Dendrobium xanthocaulon


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Genus Dendrobium section Diplocaulobium

Dendrobium chrysotropis Schltr., habit, photo B. Pottinger, based on Edinburgh cult. 681686 (Woods 2040)

Genus Dendrobium section Diplocaulobium

Dendrobium auricolor J.J.Sm., flowers, photo P. O'Byrne, based on O'Byrne D1042

Genus Dendrobium section Diplocaulobium

Dendrobium hydrophilum J.J.Sm., flower, photo Roy. Bot. Gard. Kew, based on Kew cult. (Genati K77)

Genus Dendrobium section Diplocaulobium

Dendrobium mekynosepalum Schltr., flowers, photo P. Jongejan, based on Jongejan 992

Genus Dendrobium section Diplocaulobium

Dendrobium mekynosepalum Schltr., flower detail, photo B. Kieft, based on Leiden cult. 32079

Genus Dendrobium section Diplocaulobium

Dendrobium minjemense Schltr., habit, photo N.E.G. Cruttwell, based on Cruttwell (2/88, PNG, Madang Prov., Aiome)

Genus Dendrobium section Diplocaulobium

Dendrobium phalangium Schltr., flower, photo T. Roelfsema, based on Leiden cult. 31955 (SMV 90-573)

Genus Dendrobium section Diplocaulobium

Dendrobium regale Schltr., habit, photo Roy. Bot. Gard. Edin., based on Edinburgh cult. 680864

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium, in situ, photo A. Vogel, ex PNG, Mt. Hagen, cultivated in local garden

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium, habit, photo N.E.G. Cruttwell, based on Cruttwell (2/90, PNG, Kundiawa)

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium,, flowers, photo J. Meijvogel, based on Leiden cult. 32115

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium, habit, photo Roy. Bot. Gard. Edin., based on Edinburgh cult. X63-415

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium, flowers, photo N.E.G. Cruttwell, based on Cruttwell (4/86, PNG, Kundiawa)

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium,, flowers, photo N.E.G. Cruttwell, based on Cruttwell (/67, PNG, Agaun)

Genus Dendrobium section Diplocaulobium

Dendrobium sp. sect. Diplocaulobium,, flowers, photo N.E.G. Cruttwell, based on Cruttwell (3/84, PNG, Laiagam)

Genus Dendrobium section Diplocaulobium

Dendrobium sp. nov. sect. Diplocaulobium,