Orchids of New Guinea

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Dendrobium horstii

Dendrobium horstii J.J.Sm., Icon. Bogor. 3 (1906) 23, t. 210.

Type: Bogor cult. (Horst) s.n. (holo BO).

Synonyms:

Grastidium horstii (J.J.Sm.) Rauschert, Feddes Repert. 94 (1983) 449.

Rhizome short. Stems crowded, elongated, in cross-section elliptic, rigid, 68 cm by 8.5 mm, internodes 1.75-2.5 cm long. Leaves patent, lanceolate, 14 by 4.3 cm, fleshy coriaceous, base amplexicaul, apex unequally bilobulate. Inflorescences laterally from the stems, very short; peduncle 0.35 cm long, 2-flowered. Pedicel 2.4 cm long; ovary 1.3 cm long. Flowers c. 2.5 cm across, very fleshy. Dorsal sepal 2 cm by 9 mm. Lateral sepals 1.8 cm by 1.1 mm, mentum c. 0.55 cm long. Petals 1.95 cm by 9 mm. Lip 3-lobed, when flattened 1.1 by 0.72 cm; midlobe 0.5 by 0.7 cm. Column 0.6 cm long; column-foot 0.55 by 0.5 cm.
(after Smith, 1907).

Colours:

Sepals and petals orange-yellow, lateral lobes of the lip dark violet, midlobe pale yellow-orange, column white, anther yellowish white.

Habitat:

Epiphyte in lowland rainforest.

Distribution:

New Guinea (endemic).

Distribution New Guinea:

Papua (Manokwari and Merauke Regencies).

Cultivation:

Warm growing epiphyte.

Flowering time in the wild:

Not known.

Classification:

Family Orchidaceae
Subfamily Epidendroideae
Tribe Dendrobieae
Subtribe Dendrobiinae
Genus Dendrobium
Section Grastidium
Species Dendrobium horstii

Literature:

Smith, J.J. 1911. Nova Guinea 8, 3: 561.

Notes:

Dendrobium horstii J.J.Sm. is probably a lowland species.