Accepted name: Dendrochilum simplex J.J.Sm., Bull. Dép. Agric. Indes Néerl. 22: 13 (1909)

Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

Dendrochilum remotum J.J.Sm., Bull. Inst. Bot. Buitenzorg, II, 3: 57 (1912).

 

Origin in the Wild

 

Kalimantan, Sarawak and Sabah

 

Elevation in the Wild

 

400 -2,000 metres

 

Habitat in the Wild

 

This species has been collected in Kalimantan Tengah at Liangangang.

 

Within Sarawak this species has been collected along the upper Limbang River on the route to Batu Lawi, Mount Penrissen, on Bukit Batu in the northern Hose Mountains and Mount Murud.

 

Within Sabah, this species has been collected on Mount Monkobo, Mount Alab, Pig Hill, and Mount Kinabalu and near the old airstrip at Nabawan.

 

Jeffrey Wood described the habitat as “lower montane forest, on sandstone and ultramafic substrates; primary submontane forest; podsol forest with Dacrydium spp. and dipterocarps on a very wet sandy soil, often associated with Bromheadia finlaysoniana, Bulbophyllum nabawanense; rocky places; riparian forest” (Wood 2001).

 

The Plants Description

 

The pseudobulbs cluster on an elongated rhizome that can reach a length of 40cm. The pseudobulbs are spaced 1.0-5.5cm apart, and are shaped narrowly-oblong to narrowly fusiform. The pseudobulbs measure 0.8-2.75cm long and 0.3-0.5cm in diameter. The pseudobulbs are covered by 5-6 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.15-1.5cm long. The leaf blades are shaped ovate-elliptic to narrowly elliptic and have acute to shortly acuminate apices. The leaf blades measure 2.5-16.0cm long and 0.5-1.8cm wide. The leaves are constricted below the apex, thin textured and have 5-7 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is gently curved and measures 2.0-7.5cm long. The rachis is quadrangular in cross section, curved and measures 4.0-14.0cm long. The flowers alternate distichously and are spaced 1.5-2.2mm apart. There are 1-6 appressed non-floriferous bracts at the base of the rachis.

 

The Flowers

 

The flowers are creamy white to white, pale green, yellowish green, creamy gold or yellowish cream, the labellum is often green at its base. The dorsal sepal is shaped narrowly oblong to linear-lanceolate and has an acute apex that is sometimes recurved. The dorsal sepal measures 3.7-4.0mm long and 0.7-1.1mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped obliquely narrowly lanceolate, falcate and have acute apices. The lateral sepals measure 3.0-3.9mm long and 0.7-1.1mm wide. The lateral sepals are somewhat concave; three veined and have entire margins. The petals are shaped narrowly lanceolate, falcate and have acute apices. The petals measure 2.9-3.8mm long and 0.6-1.0mm wide. The petals are concave; three veined and have minutely erose margins. The labellum is shortly clawed, porrect, decurved, three veined, entire or shallowly 3-lobed. The labellum measures 1.1-1.6mm long and 0.6-1.0mm wide. The labellum has an entire margin. If the labellum has side lobes they are erect, small and shallowly rounded. The labellum, or mid-lobe, is shaped semi-orbicular to ovate. There are two keels that terminate just over half way along the length of the labellum and are united at the base to form a U shape. The column is gently curved and measures 1.2-1.75mm long. The column foot is prominent. The apical hood is prolonged into an oblong-quadrangular shape with an obtuse to acute apex. The margin is denticulate. The stelidia grow upwards from the middle of the column and are equal to or slightly shorter than the column apex. The stelidia are shaped lanceolate, subulate and have acute to acuminate apices. The stelidia measure 0.3-1.0mm.

 

Herbarium Specimens

 

Holotype

 

SAR (Dendrochilum remotum)

 

BO

 

 

Isotype

 

Royal Botanic Gardens, Kew (K)

 

Specimen K000079133 (photo)

 

National Herbarium Netherlands (L)

 

Specimen L0056513 (photo)

 

 

Other herbarium specimens

 

AAU

 

Royal Botanic Gardens, Kew (K)

 

Specimen 63262.000

Specimen 60752.000

Specimen 60750.000

Specimen 60749.000

Specimen 61495.000

Specimen 74592.000

Specimen 51001.000

Specimen 60751.000

 

KEP

 

National Herbarium Netherlands (L)

 

Specimen L0322735

Specimen L0322736

Specimen L0322737

Specimen L0322738

Specimen L0322739

 

MEL

 

SING

 

SAR

 

AMES

 

I could not locate the specimen

 

SAN

 

BM

 

E

 

Scent

 

Yes a sweet fragrance.

 

Flowering Season

 

Flowering plants have been collected in the wild during March and from May to December.

 

Culture

 

This species is in cultivation in the United Kingdom.

 

I have grown this species mounted. This plant produces aerial roots so humidity must be high. The plant is sensitive to water quality.

 

Similar Species

 

Dendrochilum acuminatum

Dendrochilum vaginatum

 

Other Information

 

Ames wrote that this specie sis closely related to Dendrochilum vaginatum and Dendrochilum acuminatum (Ames 1920).

 

This species habit looks more like species from Sumatra in section Eurybrachium.

 

Plants described as Dendrochilum remotum have smaller leaves and flowers. The shallow lobbing described on Dendrochilum remotum is also found in the larger flowered species. Jeffrey reduced Dendrochilum remotum as a synonym of this species (Wood 2001).

 

Jeffrey Wood wrote that the habit of the plant varies according to its habitat; plants found in shady forest had leaves up to 16cm long (Wood et al).

 

The epithet refers to the simple labellum.

 

Reference

 

AMES, Oakes. 1920, Illustrations and studies of the Family Orchidaceae Facsimile 6 The Orchids of Mount Kinabalu British North Borneo, Ames Botanical Laboratory, North Easton, Massachusetts, Boston.

 

WOOD, Jeffrey. Dendrochilum of Borneo, 2001. Natural History Publications (Borneo), Malaysia.

 

WOOD, Jeffrey. 2003, Orchids of Borneo volume 4. The Sabah Society, Kota Kinabalu, Malaysia.

 

World Checklist of Selected Plant Families. 16 March 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 16 March 2009.