Accepted name: Dendrochilum pachyphyllum J.J.Wood & A.L.Lamb in J.J.Wood & P.J.Cribb, Check-list Orchids Borneo: 189 (1994)

Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sabah and Sarawak

 

Elevation in the Wild

 

1200-2000 metres

 

Habitat in the Wild

 

Jeffrey Wood wrote that this species is found in mixed hill dipterocarp forest and lower montane forest on mossy sandstone and rocky shale banks along roadsides.

 

Dendrochilum pachyphyllum has been recorded from Sabah on Mount Alab and in the Sipitang District along the Long Pa Sia to Long Samado trail and near the Malabid River crossing.

 

In Sarawak a collection has been made in the Limbang District on the route from Ulu Sungai Limbang to Batu Buli.

 

The Plants Description

 

This species is an epiphyte and occasional terrestrial. The pseudobulbs are crowded along the rhizome and shaped oblong-elliptic to narrowly fusiform. The pseudobulbs measure 0.7-1.2cm long and 0.3-0.5cm in diameter. The pseudobulbs are covered by three cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.6-1.3cm long. The leaf blades are shaped narrowly linear-elliptic and have acute apices. The leaf blades measure 2-7cm long and 0.3-0.6cm wide. The leaves are thick, fleshy and have three distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous and is shorter than the leaves. The peduncle is pendent, yellowish-green and measures 1-7cm long. The rachis is pendent, salmon-pink and measures 0.6-1.8cm long. The rachis is quadrangular in cross-section. The flowers alternate distichously and are spaced 3-4mm apart. There are 1-2 non-floriferous bracts at the base of the rachis.

 

The Flowers

 

Jeffrey Wood wrote that between three and five flowers grow on an inflorescence (Wood 2001). The flowers have translucent pink, salmon-pink or pale brownish coloured sepals with a darker median nerve. The petals are translucent pink or salmon-pink. The labellum is green at its base, its side lobes are white and mid-lobe white or dull yellow. The centre of the labellum is red to brownish-red. The column is pink and the anther cap is white (Wood 2001). The dorsal sepal is shaped ovate-elliptic and has an apiculate, sometimes carinate apex. The dorsal sepal measures 7-9mm long and 2-3mm wide. The dorsal sepal has an entire margin and is three veined. The lateral sepals are shaped ovate-elliptic and have acute, sometimes carinate apices. The lateral sepals measure 7-9mm long and 2.5-3mm wide. The lateral sepals have entire margins and are three veined. The petals are shaped elliptic and have acute apices. The petals measure 6-8mm long and 2-2.8mm wide. The petals have slightly erose margins towards their apices and are three veined. The labellum is 3-lobed, three nerved, spathulate and measures 5.5-7mm long. The side lobes are shaped linear-triangular and have acute apices that are minutely dentate. The mid-lobe is shallowly concave, shaped oblong-elliptic and has an obtuse apex. The mid-lobe is thick in its centre and has a thinner and erose margin. There is one raised keel that is 1mm wide. The keel is retuse basally and extends to the base of the mid-lobe. The column measures 4mm. The column foot is prominent. The apical hood is elongate and has a 3-4 dentate margin; the median tooth is longer. The stelidia grow upwards from the base of the column and exceed the column apex. The stelidia are shaped linear-ligulate and have subacute to acute apices. The stelidia measure 4mm.

 

Herbarium Specimens

 

Holotype

 

Royal Botanic Gardens, Kew (K)

 

Specimen – I could not locate the specimen

 

 

Isotype

 

NA

 

 

Other herbarium specimens

 

SAR

 

Royal Botanic Gardens, Kew (K)

 

Specimen 60728.000

Specimen 56815.000

Specimen 56820.000

Specimen 60729.000

 

National Herbarium Netherlands (L)

 

Specimen L0269685

Specimen L026968

Specimen L0269687

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild during February, July and from September to December.

 

Culture

 

I do not think this species is in general cultivation. The National Herbarium in the Netherlands has a specimen in their Hortus Botanicus.

 

Similar Species

 

Dendrochilum crassilabium (please visit this page for the differences)

 

Other Information

 

The epithet refers to the thick and short leaves.

 

Reference

 

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. 25 April 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 25 April 2009.