Accepted name: Dendrochilum haslamii var. quadrilobum J.J.Wood, Dendrochilum Borneo: 108 (2001).

Subgenus – Platyclinis. Section – Cruciformia.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sarawak

 

Elevation in the Wild

 

2190-2225 metres

 

Habitat in the Wild

 

This species was collected on Mount Mulu in the Gunung Mulu National Park along the path from sub-camp 4 to the summit. The habitat is described as upper montane forest and ridge top montane forest.

 

The Plants Description

 

The pseudobulbs cluster on an abbreviated rhizome that grows to 8cm long. The pseudobulbs are caespitose and shaped subfusiform or ovoid. The pseudobulbs measure 0.5-0.9cm long and 0.2-0.4cm in diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls slowly disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 2-3mm long. The leaf blades are shaped linear-ligulate and have obtuse apices that are minutely apiculate. The leaf blades measure 5-6cm long and 0.2-0.25cm wide. There are 3 distinct nerves on the blade.

 

The leaves contain crystalline calcium oxalate bodies within their leaves. The bodies are also present in related species as well.

 

The Inflorescence

 

The peduncle is erect and measures 3-4cm long. The rachis is erect and measures 5-6cm long. The rachis is quadrangular in cross-section. The flowers alternate distichously and are spaced 1.8-2.5mm apart. The rachis and peduncle are a dull red colour. There are no non-floriferous bracts at the base of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The flower colour is pale creamy green. The sepals and petals are strongly concave. The dorsal sepal is shaped oblong-ovate and has an obtuse or subacute apex. The dorsal sepal measures 1.8-1.9mm long and 1mm wide. The dorsal sepal has an entire margin and is one veined. The lateral sepals are shaped oblong-ovate and have obtuse or subacute apices. The lateral sepals measure 1.8-1.9mm long and 1mm wide. The laterals have entire margins and are one veined. The petals are shaped ovate to oblong-ovate and have obtuse to subacute apices. The petals measure 1.5mm long and 1mm wide. The petals are directed forward, have entire margins and are one veined. The labellum is four lobed; the side lobes are distinct. The labellum measures 2mm long and 1.5-1.6mm below its middle. The side lobes are a shortly rounded shape. The mid-lobe expands into to side lobules that are straight or subfalcate; there is a tiny mucro in between the side lobules. The margins on the labellum are entire. There is a U-shaped callus that extends the length of the disc and terminates at the mucro between the side lobules of the mid-lobe. The column measures 1mm long and has no foot. The apical hood is obtuse and has an entire margin. The stelidia grow from the base of the column and are equal in length to the apical hood. The stelidia are shaped linear and have obtuse apices. The stelidia measure 1.0-1.1mm long.

 

Herbarium Specimens

 

Holotype

 

Royal Botanic Gardens Kew (K)

 

Specimen 43215.000

Specimen K000078195 (photo)

 

Scent

 

No

 

Flowering Season

 

The only plant (in flower) to be collected in the wild was during October.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum haslamii var. haslamii

 

Other Information

 

The epithet refers to A.G Haslam who collected the type specimen and to the four lobed labellum.

 

This species differs from D. haslamii var haslamii by its distinct side lobes; the side lobes on D. haslamii var haslamii are minute and obscure. The side lobules of the mid-lobe are straight or subfalcate.

 

Reference

 

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

 

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

 

World Checklist of Selected Plant Families. 14 February 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 14 February 2009.