Current Genus: Genus Dendrobium section Calyptrochilus
Next Taxon: Genus Dendrobium section Conostalix
Dendrobium keytsianum
Dendrobium keytsianum J.J.Sm., Repert. Spec. Nov. Regni Veg. 12 (1913) 115; Nova Guinea 12, 3 (1916) 347, t. 126, fig. 231.
Type: Cock d'Armandville, le 246 (holo BO).
Synonyms:
- Pedilonum keytsianum (J.J.Sm.) Rauschert, Feddes Repert. 94 (1983) 460.
- Chromatotriccum keytsianum (J.J.Sm.) M.A.Clem. & D.L.Jones, Orchadian 13 (2002) 494
Stems elongated, terete, internodes 1.3-2 cm long. Leaf sheaths verruculose in apical part. Leaves patent, narrowly linear-lanceolate, 9.75-10 by 1-1.2 cm, papyraceous-coriaceous, margins near apex minutely fimbriate, apex narrowly obtuse, mucronate. Inflorescences lateral from defoliated stems, racemose, very short; rachis 0.7-0.8 cm long, c. 3-flowered. Floral bracts broadly ovate-triangular, 1 cm long, apex acuminate, outside verruculose. Pedicel and ovary 2.65 cm long, clavate, obtusely triangular in cross-section. Flowers 3.5 cm long. Dorsal sepal 1.4 cm by 8.5 mm; mentum conical, 2.1 cm long, obtuse. Petals 1.4 cm by 5 mm. Lip clawed, spathulate, when flattened 2.7 by 1.47 cm, claw for 1.55 cm adnate to the column-foot, at c. 0.95 cm above the base with a V-shaped thickening; apex cucullate, plicate, apical margin densely narrowly serrate. Column 0.5 cm long; column-foot 2.1 cm long, at the apex with a short cavity and a small tooth-shaped lamella.
(after Smith, 1916).
Flowers orange and yellow.
Epiphyte, presumably in montane forest. Altitude 1900 m.
New Guinea (endemic).
Papua (Jaya Wijaya Regency).
Cool growing epiphyte.
December.
Dendrobium keytsianum appears to belong in the alliance of Dendrobium subclausum, but with larger flowers than usual and with a V-shaped thickening on the lip, which is not normally found in D. subclausum.
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Dendrobium keytsianum
overview
Dendrobium keytsianum
Dendrobium keytsianum J.J.Sm., drawing J.J. Smith, based on le Cocq d'Armandville 246