Accepted name: Dendrochilum tortile  H.A.Pedersen, Malesian Orchid J. 7: 121 (-123; fig. 3-5). 2011 [18 Jan 2011]

Subgenus – Platyclinis. Section – Eurybrachium.


 
This photo was taken by Malcolm Perry of a plant in his collection and is used with permission.
This photo was taken by Malcolm Perry of a plant in his collection and is used with permission.
This photo was taken by Malcolm Perry of a plant in his collection and is used with permission.
This photo was taken by Malcolm Perry of a plant in his collection and is used with permission.
This photo was taken by Malcolm Perry of a plant in his collection and is used with permission.
This photo was taken by Malcolm Perry of a plant in his collection and is used with permission.
 
 

Synonyms

 

None

 

Origin in the Wild

 

Unknown, Henrik Pedersen assumed that this species was from the Philippines or Sulawesi (Pedersen 2011).

 

The cultivated plant that the holotype was taken from came from a collection of plants from Mindanao along with Dendrochilum septemnervium and Dendrochilum apoense.

 

Elevation in the Wild

 

Unknown

 

Habitat in the Wild

 

Unknown

 

The Plants Description

 

The pseudobulbs tightly cluster on a short rhizome. The pseudobulbs are shaped fusiform. The pseudobulbs measure c3.2cm long and c0.8cm in diameter. The pseudobulbs are covered by c4 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures c5.0cm long. The leaf blades are shaped linear-oblanceolate and have subacuminate apices. The leaf blades measure c17.1cm long and c4.3cm wide. The leaves are convolute and have five distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is sparsely and finely setose, suberect to arched and measures c16.8cm long. The rachis is pendent and measures c17.0cm long. The flowers alternate distichously and are spaced 2.0-3.0mm apart; the rachis twists to form a terete spiral. There is one appressed non-floriferous bract at the base of the rachis. The rachis is sparsely and finely setose. The flowers open from the distal or central section of the rachis.

 

The Flowers

 

Henrik Pedersen wrote that the flower colour is pale salmon with a yellow anther (Pedersen 2011). The sepals and petals spread widely. The dorsal sepal is shaped ovate-lanceolate and has an acute apex. The dorsal sepal measures 6.1-8.2mm long and 2.9-3.5mm wide. The dorsal sepal is three veined and has entire and sometimes recurved margins. The lateral sepals are shaped falcately ovate to ovate-lanceolate and have acuminate apices. The lateral sepals measure 5.3-7.3mm long and 2.7-3.1mm wide. The lateral sepals are 3-4 veined and have entire and sometimes recurved margins. The petals are shaped obliquely elliptic-ovate and have subacuminate apices. The petals measure 5.0-7.1mm long and 3.2-4.0mm wide. The petals are three veined, have a distinct basal fold on one side and have entire margins. The labellum is deflexed from a short fleshy porrect claw, firmly attached to the column and entire. The labellum is shaped ovate and has a subacuminate apex. The labellum measures 4.0-5.0mm long and 2.4-2.7mm wide. The labellum is 3-5 veined and has entire margins. There are two short keels at the base. The column is suberect, straight and measures 1.0-1.2mm long. There is no column foot. The apical wing barely exceeds the anther cap and is shaped truncate to retuse. The stelidia grow outwards from the level of the rostellum and are slight recurved. The stelidia are shaped linear-oblong and have rounded apices. The rostellum slightly protrudes.

 

Herbarium Specimens

 

Holotype

 

University of Copenhagen (C)

 

The specimen has not been added to the on-line database

 

Scent

 

Unknown

 

Flowering Season

 

Unknown

 

Culture

 

This species is in cultivation in the United Kingdom and Germany.

 

Similar Species

 

Dendrochilum septemnervium (see this page for the differences)

Dendrochilum convallariaeforme

 

Other Information

 

This species is most similar to Dendrochilum septemnervium.

 

This species differs from Dendrochilum convallariaeforme by the larger, non rescupinate flowers, wider petals, shorter apical wing and spreading stelidia.

 

The epithet refers to the twisted rachis and sometimes dorsal sepal.

 

Henrik Pedersen wrote that even though the geographical range is unknown the spirally twisted rachis could indicate a relationship with Sulawesi or the Philippines.

 

Reference -

 

PEDERSEN, Henrik. 2011. Three new species of Dendrochilum, with notes on the practice of formally describing cultivated species of unknown provenance, The Malesian Orchid Journal, Vol 7 p117-124