Accepted name: Dendrochilum hastilobum J.J.Wood, Orchid Rev. 103: 5 (1995 publ. 1994)

Subgenus – Platyclinis. Section – Cruciformia.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sarawak

 

Elevation in the Wild

 

1560 metres

 

Habitat in the Wild

 

This species has only been recorded on the route to Batu Lawi at Ulu Limbang along the Pa Mario River. The habitat was recorded by Jeffrey Wood as Lower Montane Ridge Forest. The holotype states that it was found as an epiphyte at 3 metres high.

 

The Plants Description

 

The pseudobulbs are spaced 0.5-1.5cm apart on a branching rhizome that grows 6-9cm long. The pseudobulbs are shaped cylindrical or fusiform. The pseudobulbs measure 1.0-1.8cm long and 0.3-0.5cm in diameter. The pseudobulbs are covered by three cataphylls while they are growing. The cataphylls disintegrate into non-persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.4-1.0cm long. The leaf blades are shaped linear-ligulate to narrowly-elliptic and have obtuse, mucronate or subacute apices. The leaf blades measure 6.5-9.5cm long and 0.4-0.6cm wide. There are 3-4 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 1.8-2.8cm long. The rachis is suberect and measures 3.5-7.5cm long. The rachis is quadrangular in cross-section. The flowers alternate distichously and are spaced 3-4mm apart. There are no non-floriferous bracts at the base of the rachis.

 

The Flowers

 

Jeffrey Wood wrote that the flowers number between 9 and 20 (Wood 2001). The flowers are greenish-brown. The dorsal sepal is concave, shaped narrowly elliptic and has an acute apex. The dorsal sepal measures 4mm long and 1mm wide. The dorsal sepal has an entire margin and is three veined. The lateral sepals are shaped oblong-elliptic and have acute apices. The lateral sepals measure 4.1mm long and 1mm wide. The lateral sepals have entire margins and are three veined. The petals are shaped narrowly elliptic and have acute apices. The petals measure 4mm long and 0.9-1mm wide. The petals have entire margins and are three veined. The labellum is porrect and 3-lobed. The labellum measures 3.8-4mm long and 3mm at its widest point. The side lobes are shaped triangular and have acute apices. The mid-lobe is shaped broadly hastate and has an acute apex. The margins on the labellum are entire. There are 2 distinct elevated keels that start at the base of the hypochile and terminate at the junction between the side lobes and the mid-lobe. The column measures 1.8-1.9mm long. The column foot is very short. The apical hood is elongate, shaped narrowly ovate-elliptic and has a subacute apex that has entire margins. The apical hood measures between 0.8-1mm long. The stelidia grow from the base of the column and are slightly shorter than the apical hood. The stelidia are shaped oblong-ligulate and have obtuse apices. The stelidia measure 1.6-1.7mm long.

 

Herbarium Specimens

 

Holotype

 

Royal Botanic Gardens Kew (K)


Specimen K000078197 (photo)

Specimen 60701.000

Specimen K000078196 (photo)

 

Isotype

 

National Herbarium Netherlands Leiden (L)

 

Specimen L0052453 (photo)

 

SAR

 

SING

 

Scent

 

I could find no record.

 

Flowering Season

 

The only flowering plants collected in the wild were taken during August.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum devogelii

Dendrochilum cruciforme

Dendrochilum dolichobrachium

 

Other Information

 

Jeffrey Wood wrote that this species is closely related to Dendrochilum dolichobrachium but differs by the larger flowers, leaves, short column foot and the large hastate mid-lobe.

 

The epithet refers to the hastate mid-lobe.

 

Reference

 

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

 

World Checklist of Selected Plant Families. 15 February 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 15 February 2009.