Prev Species: Dendrobium biloculare

Next Species: Dendrobium crassilabium


Dendrobium convolutum

Dendrobium convolutum

Dendrobium convolutum Rolfe, Bull. Misc. Inform. Kew (1906) 375.

Type: Sander cult. s.n. (XI-1898, New Guinea) (holo K).

Synonyms:

  • Sayeria convoluta (Rolfe) Rauschert, Feddes Repert. 94 (1983) 466.

An epiphytic herb. Pseudobulbs clustered, subclavate, up to 30 by 1.3 cm, 4-5-noded below leaves, yellow, 3-leaved at apex. Leaves subcoriaceous, spreading or suberect, elliptic-lanceolate, acute, up to 13.5 by 5 cm. Inflorescences suberect, few-flowered, 10-12 cm long; bracts ovate, apiculate, 6 by 3 mm. Flowers opening widely; ovary and pedicel 2.5 cm long. Dorsal sepal ovate, acute, 1.6-1.8 by 0.8 cm; lateral sepals obliquely triangular, acute, 1.5 by 1.2 cm; mentum obliquely conical, 1 cm long. Petals narrowly elliptic-oblanceolate, acute or subacute, 1.4 by 0.5 cm. Lip 3-lobed, recurved, 1.6-1.8 by 1.7-2.3 cm; side-lobes erect, subquadrate, slightly dilated above; midlobe transversely oblong-reniform, apiculate; callus 3-ridged, outer ridges longer than mid-ridge. Column dentate at apex, 2 mm long; foot 1 cm long.
(after Cribb, 1983).


Sepals and petals apple green; lip with maroon veins on side lobes and heavily suffused maroon on midlobe; callus glossy, maroon.

Epiphyte in rainforest near the coast. Altitude 0 to 650 m.

New Guinea.

Papua New Guinea (Madang, Morobe and Milne Bay Provinces).

Map: Dendrobium convolutum Rolfe, distribution map, redrawn from P. Cribb, Kew Bull. 38 (1983) 250, map 4, with new records added.

Warm growing epiphyte.

June.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Dendrobieae
  • Subtribe Dendrobiinae
  • Genus Dendrobium
  • Section Latouria
  • Species Dendrobium convolutum
  • Betts, J.J. 1979. Orchadian 6: 134, fig.
  • Cribb, P.J. 1983. Kew Bull. 38: 252, pl. 10B, map 4.
  • O'Byrne, P. 1994. Lowland Orchids of Papua New Guinea: 278, fig.
  • Reeve, T.M. 1980. Orchadian 6: 152.
  • Spence, P.J. 1997. Lasianthera 1: 155, fig. 3, pl. 2A.

The flowers of Dendrobium convolutum Rolfe resemble those of Dendrobium macrophyllum A.Rich. but are smaller, distinctively coloured, lack any hairs on the outer surface and have a distinctive callus on the lip. It was described by Rolfe from a plant sent to him by F. Sander which arrived in a batch of Dendrobium atroviolaceum. As the latter is found only in Milne Bay Province, this may well be the type locality of Dendrobium convolutum as well.
(after Cribb, 1983).


Sponsored Ads

Dendrobium convolutum

Dendrobium convolutum Rolfe, flowers, photo D. Titmuss, based on E. Zielkajis cult.

Dendrobium convolutum

Dendrobium convolutum Rolfe, flower, photo P. O'Byrne, based on O'Byrne D250

Dendrobium convolutum

Dendrobium convolutum Rolfe, photo John Cara, plant habit, cult John Cara, from PNG.

Dendrobium convolutum

Dendrobium convolutum Rolfe, photo John Cara, inflorescence, cult John Cara, from PNG.

Dendrobium convolutum

Dendrobium convolutum Rolfe, photo John Cara, inflorescence, cult John Cara, from PNG.

Dendrobium convolutum

Dendrobium convolutum Rolfe, photo John Cara, flower, front view, cult John Cara, fromPNG.

Dendrobium convolutum

Dendrobium convolutum Rolfe, photo John Cara, flower, front view, cult John Cara, from PNG, Finschhafen.

Dendrobium convolutum

Dendrobium convolutum Rolfe, flower, front view, photo John Cara, based on Cara cult. s.n. from PNG

Dendrobium convolutum

Dendrobium convolutum Rolfe, flower, oblique front view, photo John Cara, based on Cara cult. s.n. from PNG

Dendrobium convolutum

Dendrobium convolutum Rolfe, flower, oblique lateral view, photo John Cara, based on Cara cult. s.n. from PNG

Dendrobium convolutum

Dendrobium convolutum Rolfe, flower, lateral view, photo John Cara, based on Cara cult. s.n. from PNG

Dendrobium convolutum

Dendrobium convolutum Rolfe, colour pencil drawing John Cara, plant habit, flower analysis, from PNG.