Accepted name: Dendrochilum pubescens L.O.Williams, Bot. Mus. Leafl. 6: 58 (1938).



Subgenus – Platyclinis. Section – Platyclinis.


 
 
 

Synonyms

 

None

 

Origin in the Wild

 

Brunei, Sarawak

 

Elevation in the Wild

 

200 – 1,300 metres

 

Habitat in the Wild

 

This species has been found in Sarawak on Mount Temabok, Pulong Tao National Park and along the ridge leading to Bukit Batu in the Northern Hose Mountains.

 

Within Brunei this species has been found at Batu Melintang, Belait Melilas, the Ingei River on the path from the camp to the hot springs and on the ridge leading to Mount Retak.

 

This species is found in mixed dipterocarp forest and lower montane dipterocarp forest. This species has been collected on ridge tops and on trees near waterfalls.

 

The Plants Description

 

The pseudobulbs cluster along an elongated rhizome that can reach a length of 45cm. The pseudobulbs are spaced 0.5-5.0cm apart and are shaped ovoid. The pseudobulbs measure 0.5-2.5cm long and 1.0cm in diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.6-4.0cm long. The leaf blades are shaped oblanceolate or narrowly elliptic and have acute to acuminate apices. The leaf blades measure 4.0-22.0cm long and 0.5-3.5cm wide. The leaves are thin textured and have seven nerves of which three are prominent. The leaves are covered by a black or brown pubescent, the pubescent is denser on the upper surface.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is erect to curved and measures 5.0-14.0cm long. The rachis is quadrangular in cross section, curved to pendent and measures 2.0-5.0cm long. The flowers alternate distichously and are spaced 2.0-6.0mm apart. There are no appressed non-floriferous bracts at the base of the rachis. The inflorescence is pubescent.

 

The Flowers

 

Between 3 and 10 flowers grow on an inflorescence (Wood 2001). The flowers are green to brownish ochre or translucent yellow. The labellum is green to orange brown and the column green or white. The dorsal sepal is concave, shaped oblong-elliptic and has an acute apex. The dorsal sepal measures 7.0-8.0mm long and 3.0-3.5mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped slightly obliquely ovate-elliptic and have acute apices. The lateral sepals measure 6.9-7.0mm long and 3.0mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped oblong-elliptic and have acute apices. The petals measure 6.0-6.8mm long and 2.5-3.0mm wide. The petals are shortly clawed; three veined and have erose margins. The labellum is shortly clawed, shallowly concave, minutely papillose, three veined and entire. The labellum measures 5.0-5.2mm long and 2.5-3.0mm wide. The labellum has an erose-dentate margin on its distal half and a lacerate margin on its basal half. The labellum is shaped oblong-ovate and has an acute apex. There are two short keels that are not joined at the base. The column is gently curved and measures 3.0-3.8mm long. The column foot is prominent. The apical hood is prolonged into an oblong shape and has a tridentate or unevenly toothed margin. The stelidia grow upwards from the middle of the column and are shorter than the column apex. The stelidia are shaped falcate, slightly incurved and have acute apices. The stelidia measure 1.0-1.1mm.

 

Herbarium Specimens

 

Holotype

 

AMES

 

I could not locate the specimen

 

 

Isotype

 

SING

 

 

Other herbarium specimens

 

National Herbarium Netherlands (L)

 

Specimen L0322710

 

BRUN

 

Royal Botanic Gardens, Kew (K)

 

Specimen 60742.000

Specimen 60740.000

Specimen 60741.000

Specimen K000396016

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild during April and from November to January.

 

Culture

 

I do not think this species is in cultivation.

 

Similar Species

 

Dendrochilum hamatum (see this page for the differences)

Dendrochilum vestitum (see this page for the differences)

 

Other Information

 

This species has only been collected a few times, two within Sarawak and another in Brunei.

 

This species differs from all other Dendrochilum on Borneo by the pubescence on the leaves, cataphylls, inflorescence and sepals.

 

The epithet refers to the pubescent nature of its habit.

 

Reference

 

BEAMAN, Teofila, WOOD, Jeffrey, BEAMAN, Reed, BEAMAN, John. 2001, Orchids of Sarawak, Natural History Publications Borneo, Kota Kinabalu, Malaysia.

 

WOOD, Jeffrey. 1997, Orchids of Borneo volume 3. The Sabah Society, Kota Kinabalu, Malaysia.

 

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

 

World Checklist of Selected Plant Families. 24 July 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 24 July 2009.