Accepted name: Dendrochilum septemnervium H.A.Pedersen, Malesian Orchid J. 7: 119 (-121; fig. 2). 2011 [18 Jan 2011]



Subgenus – Platyclinis. Section – Eurybrachium.


 

This photo was taken by Trey Sanders of a plant in his collection. (C)

Take note of the bifoliate leaf.

This photo was taken by Trey Sanders of a plant in his collection. (C)
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 tortile and Dendrochilum apoense.

 

Elevation in the Wild

 

Unknown

 

Habitat in the Wild

 

Unknown

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome. The pseudobulbs are shaped fusiform. The pseudobulbs measure 3.8-5.0cm long and c0.7cm in diameter. The pseudobulbs are covered by c5 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 4.7-6.1cm long. The leaf blades are shaped linear-oblanceolate and have subacute apices. The leaf blades measure c15.2cm long and c2.9cm wide. The leaves are convolute and have five distinct nerves.

 

I once had a bifoliate leaf on one of my plants.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is sparsely and finely setose, suberect to arched and measures 5.7-20cm long. The rachis is pendent and measures 12.3-19.2cm long. The flowers alternate distichously and are spaced 1.0-2.0mm apart; the rachis twists to form a cylindrical 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 proximal 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 lanceolate to obovate and has an obtuse to subacuminate apex. The dorsal sepal measures 6.6-7.6mm long and 2.8-3.9mm wide. The dorsal sepal is seven veined and has entire margins. The lateral sepals are shaped falcately lanceolate to ovate and have acuminate apices. The lateral sepals measure 5.5-6.8mm long and 2.4-3.4mm wide. The lateral sepals are five veined, have entire and recurved margins. The petals are shaped obliquely lanceolate to elliptic-ovate and have acute to acuminate apices. The petals measure 5.4-6.5mm long and 2.3-3.6mm wide. The petals are 3-4 veined, have a distinct basal fold on one side and have entire margins. The labellum is porrect, firmly attached to the column and entire. The labellum is shaped lanceolate and has an acute to acuminate apex. The labellum measures 4.6-5.9mm long and 1.7-2.3mm wide. The labellum is three veined and has entire margins. There are three keels; the two lateral keels are short and located along the lateral nerves. The median keel is flat and runs the length of the labellum. The column is suberect, straight and measures 1.4-1.6mm long. There is no column foot. The apical hood barely exceeds the anther cap and is shaped truncate. The stelidia are attached to the entire length of the column and protrude from the top of the column, terminating above the column's apex. The rostellum slightly protrudes.

 

Herbarium Specimens

 

Holotype

 

University of Copenhagen (C)

 

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

 

Scent

 

Yes, a sour scent that reminds me of millipedes. I have noticed that the scent becomes sweeter when the plant is placed in full sunlight.

 

Flowering Season

 

Unknown

 

Culture

 

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

 

Similar Species

 

Dendrochilum tortile

 

Other Information

 

Henrik Pedersen wrote that this species is similar to Dendrochilum tortile but differs by, the seven nerved dorsal sepal (3-nerved in D. tortile), five nerved lateral sepals (3-4 in D. tortile), porrect petals (spreading in D. tortile), porrect labellum with three keels (deflexed with two short keels in D. tortile), stelidia that are more inconspicuous, erect, broadly and obliquely triangular (spreading and linear-oblong in D. tortile).

 

I have added measurements of my plants to Henrik Pedersen's description and my own observations on the scent.

 

The epithet refers to the seven nerved 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