Accepted name: Dendrochilum jiewhoei J.J.Wood, Dendrochilum Borneo: 232 (2001)



Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sarawak

 

Elevation in the Wild

 

1341 metres

 

Habitat in the Wild

 

This species has only been collected once on Mount Penrissen its habitat is lower montane forest.

 

The Plants Description

 

The pseudobulbs cluster together along a rhizome that can grow to 7cm long. The pseudobulbs are shaped ovoid to cylindrical and measure c1.0cm long and 0.4-0.8cm in diameter. Jeffrey Wood described the pseudobulbs as yellowish-olive (Wood 2001). The pseudobulbs are covered by 2-3 cataphylls while they are growing. The cataphylls disintegrate into fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 1.4-2.0cm long. The leaf blades are shaped narrowly-elliptic to oblong-elliptic and have obtuse and mucronate apices. The leaf blades measure 6.5-11.5cm long and 0.9-1.8cm wide. The leaves are thin-textured and have 5-7 distinct nerves along their length.

 

The Inflorescence

 

The peduncle is gently curved and measures 7.0-8.5cm long. The rachis is gently curved and measures 13.0-20.0cm long. The rachis is quadrangular in cross-section. The flowers alternate distichously and are spaced 2.0-3.0mm apart. There are 1-4 non floriferous bracts at the base of the rachis. The flowers open from either the proximal or central section of the rachis, although this not completely known.

 

The Flowers

 

The dorsal sepal is shaped narrowly elliptic and has an acute to acuminate apex.  The dorsal sepal measures 4.5-4.6mm long and 1.1-1.5mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped narrowly elliptic to somewhat ovate-elliptic and have acute to acuminate apices. The lateral sepals measure 4.1-4.2mm long and 1.3-1.5mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped narrowly elliptic and have acute to acuminate apices. The petals measure 3.9-4.1mm long and 1.2mm wide. The petals are three veined and have entire margins. The labellum has a short claw, is three nerved, 3-lobed and is minutely papillose. The labellum measures 3.2-4.0mm long and 1.8-2.1mm wide. The side lobes are flat and shaped triangular to narrowly triangular. The side lobe margins are minutely erose. The mid-lobe is shaped oblong-triangular to triangular-ovate and has an acute to acuminate apex. The margins of the mid-lobe are slightly irregular. There are two keels are joined at the base of the labellum and form a cavity. The keels terminate just over half way along the length of the labellum. There is an elevated median nerve in between the keels. The column is incurved and measures 1.4-1.5mm long. The column foot is short. The apical hood is elongated, into a rounded apex with a slightly irregular to obscurely tridentate margin. The stelidia grow upwards from the base* of the column and are slightly shorter than or equal to the column apex. The stelidia are shaped falcate and have acute apices. The stelidia measure 1.0-1.1mm long.

 

* Jeffrey Wood’s description states basal however the drawing in the Dendrochilum of Borneo depicts the stelidia as growing from the middle of the column.

 

Herbarium Specimens

 

Holotype

 

AMES

 

I could not locate this specimen

 

Isotype

 

Royal Botanic Gardens Kew (K)

 

Specimen K000079135 (photo)

Specimen 61440.000

 

Other herbarium specimens

 

NA

 

Scent

 

I could find no record.

 

Flowering Season

 

Date of collection not recorded.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum kamborangense

 

Other Information

 

This species was only described in 2001 even though the plant material was unstudied and collected during the 1920s. The herbarium material was loaned to Kew by the AMES herbarium for determination. The material was found to be an un-described species.

 

Mount Penrissen is well collected and it is odd that this species has not been collected since. It could be found on nearby mountains or it’s just a rare species.

 

This plant differs from Dendrochilum kamborangense by its shorter pseudobulbs and leaves, entire margins on the petals and smaller flowers, shorter column, less prominent column foot and stelidia that are approximately equal to the column apex.

 

The epithet refers to Mr Tan Jiew Hoe of Singapore who financially assisted with the printing costs and colour plates for Jeffrey Wood’s The Dendrochilum of Borneo (Wood 2001).

 

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.

 

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

 

World Checklist of Selected Plant Families. 23 July 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 23 July 2009.