Accepted name: Dendrochilum undulatum H.A.Pedersen, Orchid Rev. 115: 225 (2007)

Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

Unknown

 

Habitat in the Wild

 

In email correspondence Jim Cootes wrote that this species is found in the central mountainous regions of Nueva Vizcaya and Nueva Ecija (Jim Cootes pers comm).

 

The Plants Description

 

The pseudobulbs cluster along the rhizome and are shaped ellipsoid-oblongoid. The pseudobulbs measure c2.4cm long and c1.2cm in diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are convolute and petiolate; the petiole measures 3.4-4.2cm long. The leaf blades measure 11.8-12.9cm long and 2.6-3.9cm wide. The leaf blades are shaped lanceolate and have acuminate apices; their margins are usually undulate. The leaves have 5-7 distinct nerves, the outermost nerves are 2-3mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is sub-erect and measures 6.5cm long. The rachis is nodding and measures 8.7-12.7cm long. The flowers alternate distichously and are spaced 5-7mm apart. There is one non-floriferous bract at the based of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The description below has been taken from Henrik Pedersen’s description

 

Henrik Pedersen wrote that between 13-17 flowers grow on one inflorescence. The flowers are a greenish-cream colour and turn an apricot colour as they age. The dorsal sepal spreads to become nearly porrect, is shaped narrowly lanceolate and has a recurved apex. The dorsal sepal measures 10.4-11.5mm long and 2.7-2.9mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals spread, shaped linear-lanceolate and have recurved, sub-acuminate, mucronate apices. The lateral sepals measure 10.3-11.5mm long and 3-3.2mm wide. The lateral sepals are three veined and have entire margins. The petals are porrect, shaped narrowly linear-lanceolate and have recurved, sub-acute, acuminate apices. The petals measure 9.2-9.8mm long and c1.6mm wide. The petals are one veined and have entire margins. The labellum is entire and porrect. The labellum is shaped elliptic and has an obtuse apex. The labellum measures 9.1-9.7mm long and 5.3-5.5mm wide. The labellum is three veined on it, minutely papillose basally and glabrous elsewhere. There are two lateral keels below the middle and two median keels from the base to the middle. The column is incurved and measures 6.4-6.7mm long. The stelidia grow from just below the apical hood are small and shaped falcately oblong.

 

Herbarium Specimens

 

I couldn’t locate any

 

Scent

 

Unknown

 

Flowering Season

 

It is not known when this species flowers in the wild. Cultivated specimens flower from mid to late summer in the northern hemisphere.

 

Culture

 

This species is in cultivation in Europe and Australia.

 

Additional Comments

 

The epithet refers to the wavy/undulate leaf margins.

 

Henrik Pedersen wrote that the combination of the one veined petals, the elliptic shaped labellum and the sub-apical position of the stelidia distinguishes this species from all other known species (Pedersen 2007).

 

Reference

 

PEDERSEN, Henrik. 2007. Changes to Dendrochilum, 2007, The Orchid Review, Vol 115 p220-226

 

World Checklist of Selected Plant Families. 30 August 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 30 August 2008.