Accepted name: Dendrochilum apoense T.Hashim., J. Jap. Bot. 56: 335 (1981)



Subgenus – Platyclinis. Section – Eurybrachium.


 
 

 

Synonyms

 

None

 

Origin in the Wild

 

Mindanao

 

Elevation in the Wild

 

The elevation has not been recorded and I have not been able to find the elevation of the Mount Apo Forestry Development Office.

 

Habitat in the Wild

 

This species has been collected near the Forestry Development Office on Mount Apo in the Davao del Sur province of Mindanao

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome. The pseudobulbs are shaped narrowly pyriform. The pseudobulbs measure 1.5-2.0cm long and c0.5cm in diameter. The pseudobulbs are covered by cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.4-0.6cm long. The leaf blades are shaped linear-lanceolate to narrowly elliptic and have retuse and obtuse apices. The leaf blades measure 2.3-5.5cm long and 4-8.5mm wide. The leaves are coriaceous and have 7 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous and appears as the leaves are subtending. The peduncle is suberect. The rachis is gently curved and measures 2.5-3.5cm long. The flowers alternate distichously, the rachis twists to form a spiral. There are no appressed non-floriferous bracts at the base of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

Hashimoto's descriptions states that between 20-25 flowers are found on an inflorescence, I have never observed this many flowers on an inflorescence of one of my plants, the flower count is usually much lower. The sepals and petals are yellowish and the labellum is orange-red. The sepals and petals spread widely. The dorsal sepal is shaped ovate-oblong with a truncate-obtuse and mucronate apex. The dorsal sepal measures c2mm long and 0.7-1.0mm wide. The dorsal sepal does not appear to be veined and has entire margins. The lateral sepals are shaped obliquely ovate-oblong and have truncate, obtuse-apiculate apices. The lateral sepals measure c2.2mm long and 1.1mm wide. The lateral sepals are obscurely 1 veined and have entire margins. The petals are shaped narrowly elliptic with subacute apices. The petals measure 2.2?mm long and 0.8mm wide. The petals are obscurely 1 veined and have erose margins. The labellum is pendent and entire. The labellum is shaped ovate and has an obtuse apex. The labellum measures 1.7mm long and 1.2mm wide. The labellum is obscurely 1-veined and has erose margins. There are no ornaments on the labellum. The column is suberect measures 0.5mm long. The column apex is four dentate. The stelidia grow upwards from the middle of the column and are equal to or slightly exceed the column apex. The stelidia measure 0.25-0.3mm long.

 

Herbarium Specimens

 

Holotype


TNS

 

Scent

 

Yes, a faint sweet scent

 

Flowering Season

 

Cultivated plants flower during April and May in the United Kingdom.

 

Culture

 

I know of three people, including myself, who grow this species in the United Kingdom. This species is in cultivation in Germany, I do not know how widely. The plant was imported from the Philippines into Europe as an unknown Dendrochilum species during 2005-2006. The plant was identified by Henrik Pedersen when Malcolm Perry flowered his plant and emailed the pictures to him.

 

Based on the species I have grown I have found this species to be the most difficult in the genus to cultivate. The plants I have had have all been extremely sensitive to water quality, salinity in potting mix, lack of air movement and repotting. After repotting one plant it subsequently lost its leaves quite quickly. The leaves are very susceptible to rotting if the air circulation isn't continual.

 

I have had a plant with false red spider mite.

 

Similar Species

 

Dendrochilum ambangense (see this page for the differences)

Dendrochilum eymae (see this page for the differences)

 

Other Information

 

At the time that Henrik Pedersen wrote his enumeration of Philippine Dendrochilum this species was only known from the holotype. Pedersen was unable to obtain the herbarium material so used Hashimoto's description.

 

This species differs from Dendrochilum eymae and Dendrochilum ambangense by the erose petals and entire labellum with erose margins.

 

Reference -

 

PEDERSEN, Henrik. 1997, The Genus Dendrochilum (Orchidaceae) in the Philippines - A Taxonomic Revision. Opera Botanica, Denmark

 

World Checklist of Selected Plant Families. 24 July 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 24 July 2009.