Orchids of New Guinea

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Dendrobium trichostomum

Dendrobium trichostomum Rchb.f. ex Oliv., J. Linn. Soc., Bot. 15 (1875) 30.

Type: Meyer 1; 2 (New Guinea, Geelvinck Bay) (syn K).

Synonyms:

Dendrobium oreogenum Schltr., in K.Schum. & Lauterb., Nachtr. Fl. Deutsch. Schutzgeb. Südsee (1905) 177; Repert. Spec. Nov. Regni Veg. Beih. 21 (1923) t. 177, fig. 661.
- Type: Schlechter 14308 (holo B, lost; iso AMES, BM, BO, K, NSW, P).
Pedilonum oreogenum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 462.
Dendrobium quadriquetrum J.J.Sm., Repert. Spec. Nov. Regni Veg. 12 (1913) 119; Nova Guinea 12, 3 (1916) 338, t. 122, fig. 223.
- Type: Coenen 45 (holo BO).
Pedilonum quadriquetrum (J.J.Sm.) Rauschert, Feddes Repert. 94 (1983) 463.
Pedilonum trichostomum (Rchb.f. ex Oliv.) Rauschert, Feddes Repert. 94 (1983) 464
Dendrobium mystroglossum Schltr., Bot. Jahrb. Syst. 58 (1923) 103.
Pedilonum mystroglossum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 461.
Chromatotriccum mystroglossum (Schltr.) M.A.Clem. & D.L.Jones, Orchadian 13 (2002) 495
Chromatotriccum quadriquetrum (J.J.Sm.) M.A.Clem. & D.L.Jones, Orchadian 13 (2002) 495
Chromatotriccum trichostomum (Rchb.f. ex Oliv.) M.A.Clem. & D.L.Jones, Orchadian 13 (2002) 496

Rhizome very short, roots elongated, filiform, flexuose, glabrous. Stems crowded, erect, slender, more or less quadrangular in cross-section, 20-40 cm by 0.3-0.5 mm, many-leaved. Leaf sheaths entirely covering the stem. Leaves erect-patent, lanceolate to lanceolate-oblong, 3.5-7.5 by 1.3-1.8 cm, apex acuminate, papyraceous. Inflorescences racemose, short, 6-12-flowered. Floral bracts lanceolate, much shorter than the pedicel and ovary, apex acuminate, glabrous, membranaceous. Pedicel and ovary 1.4 cm long, slender, terete. Flowers resupinated or not, c. 1.5 cm long. Dorsal sepal narrowly ligulate, 1.3 cm long, apex obtuse. Lateral sepals oblong, widened at the base, 1.3 cm long, apex subapiculate; mentum relatively short. Petals obliquely sublinear-spathulate, c. 1.2 cm long, apex obtuse. Lip concave, clawed, spathulate, 1.4 cm long, margins in apical half incurved, lacerate-fimbriate. Column short, clinandrium 3-dentate; column-foot elongated. Anther transversely subquadrate-cucullate.
(largely after Schlechter, 1912 - as Dendrobium oreogenum).

Colours:

Flowers scarlet or purple-red.

Habitat:

Epiphyte in hill forest. Altitude 500-900 m.

Distribution:

New Guinea (endemic).

Distribution New Guinea:

Papua (Manokwari and Nabire Regencies); Papua New Guinea (Sandaun and East Sepik Provinces).

Cultivation:

Intermediate growing epiphyte.

Flowering time in the wild:

February, April, June-September.

Literature:

Schlechter, R. 1912. Repert. Spec. Nov. Regni Veg. Beih. 1: 522.

Notes:

Dendrobium trichostomum is a characteristic species because of the short mentum, the narrow sepals and petals, and the long-fringed upper margin of the lip.