Accepted name: Dendrochilum ambangense H.A.Pedersen, Nordic J. Bot. 15: 391 (1995 publ. 1996)

Subgenus – Platyclinis. Section – Eurybrachium.

 

 

 

 

Synonyms

 

None

 

Origin in the Wild

 

Sulawesi

 

Elevation in the Wild

 

1780 metres

 

Habitat in the Wild

 

The type specimen was collected at Bolaang Mongondow, Gunung Ambang Nature Reserve. This specimen was recorded growing as an epiphyte on a tree trunk. The trunk was overloaded with other epiphytes and growing in 25m high elfin forest.

 

The Plants Description

 

This small species has pseudobulbs that cluster along a short rhizome. The pseudobulbs are shaped fusiform to slenderly ellipsoid. The pseudobulbs measure 0.7-1.5cm long and 0.3-0.4cm in diameter. The pseudobulbs are covered by 4 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaf is petiolate; the petiole measures 0.5-1.7cm long. The leaf blades are shaped lanceolate with acute apices, sometimes minutely mucronate. The blades measure 1.8-6.6cm long and 0.4-1.1cm wide. The leaf is thin textured and has 3-5 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is sub-erect to curved measuring 4.5-8cm long. The rachis is nodding and measures 1.8-5.1cm long. The flowers alternate distichously and are spaced 1.0mm apart, the rachis twists to form a cylindrical spiral. There are 1-2 non floriferous bracts at the base of the rachis. The flowers open from the distal part of the rachis.

 

The Flowers

 

15+ flowers grow on an inflorescence (Pedersen 1995). The sepals and petals are a pale red colour and are scattered with ocelli, the labellum is dark red. The sepals and petals open widely. The dorsal sepal is shaped oblong and has a rounded apex. The dorsal sepal measures 1.8-2.4mm long and 0.6-0.9mm wide. The dorsal sepal is one veined and has entire margins. The lateral sepals are shaped elliptic-oblong and have obtuse apices. The lateral sepals measure 0.8-2.2mm long and 0.6-0.9mm wide. The lateral sepals are one veined and have quite entire margins. The petals are shaped oblanceolate-oblong with rounded apices. The petals measure 1.6-1.8mm long and 0.8-0.8mm wide. The petals are two veined, glabrous and have quite entire margins. The labellum is porrect, three veined, glabrous, 3-lobed and more or less recurved. The labellum measures 1.3-1.5mm long and 0.8-1mm wide. The side lobes are spreading, smaller than the mid-lobe and shaped obliquely triangular with acute apices. The mid-lobe is shaped transversely elliptic and has a rounded apex. There is a transversely E-shaped callus on its disc.  The column is sub-erect to straight and measures 1.1-1.2mm long. The apical hood is prolonged into a rounded apex. The apical hood margin is dentate to almost entire. The stelidia are small and grow upwards from the top of the column. The stelidia are equal to the column apex.

 

Herbarium Specimens

 

Bogor (BO)

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected during April.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum eymae (see this page for the differences)

Dendrochilum apoense

 

Additional Comments

 

Henrik Pedersen wrote that this species is closely related to Dendrochilum apoense and Dendrochilum eymae. Dendrochilum ambangense differs from D. apoense by its entire petals and 3-lobed labellum. Dendrochilum ambangense differs from D. eymae by its subacute side lobes and supapical stelids.

 

When Henrik Pedersen first described this species it was still only known from the type.

 

Reference -

 

PEDERSEN, Henrik. 1995, Thirteen new species of Dendrochilum (Orchidaceae), a new record from Burma, and a checklist of the genus in East Malesia. Nord. J. Bot 15:381-402. Copenhagen, Denmark.

 

World Checklist of Selected Plant Families. 11 September 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 11 September 2008.