Accepted name: Dendrochilum pangasinanense Ames, Schedul. Orchid. 6: 29 (1923)

Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Luzon and Cebu

 

Elevation in the Wild

 

900 metres on Cebu

 

Habitat in the Wild

 

This species has been collected on Luzon in the Pangasinan Province and on Mount Cabalasan on the island of Cebu.

 

The plant was found growing in Cebu on rocks and on cuttings along the edges of roads often in full sun (Pedersen 2001).

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome and are shaped fusiform-terete. The pseudobulbs measure 4.4-9.0cm long and 0.6-1.0cm in diameter. The pseudobulbs are covered by 4-7 cataphylls when they are growing; the cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 2.5-4.4cm long. The leaf blades are shaped oblanceolate to lanceolate-oblong and have obtuse apices. The leaf blades measure 10.6-19.8cm long and 2.1-3.6cm wide. The leaves are leathery and have 7-9 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous and appears with the new growth, the leaves have still not fully expanded when the flowers start to finish. The peduncle is erect and measures 13.0-18.4cm long. The rachis is nodding to pendent and measures 10.4-11.4cm long. The flowers alternate distichously and are spaced 5.0-8.0mm apart. There are 1-2 appressed non floriferous bracts at the base of the rachis (Pedersen 2001). None of my plants have non-floriferous bracts.

 

The Flowers

 

Up to 25 flowers grow on an inflorescence (Cootes 2005). The sepals and petals spread widely. The sepals are glabrous or have a few minute trichomes on the abraxial side. The dorsal sepal is shaped broadly lanceolate to lanceolate-oblong and has a subacute to acuminate apex. The dorsal sepal measures 8.2-9.0mm long and 2.8-4.1mm wide. The dorsal sepal is five veined and has an entire margin. The lateral sepals are shaped slightly oblique, ovate to narrowly elliptic and have acute to acuminate apices. The lateral sepals measure 8.2-9.3mm long and 3.6-4.7mm wide. The lateral sepals are five veined and have entire margins. The petals are shaped obliquely oblong to elliptic and have obtuse to abruptly acuminate apices. The petals measure 7.4-7.8mm long and 3.0-3.8mm wide. The petals are three veined and have entire margins. The labellum is easily versatile, pendent and 3-lobed. The labellum measures 6.5-7.0mm long and 3.3-3.8mm wide. The labellum is five veined and has finely crenate margins around the side lobes; the rest of the labellum has entire margins. The side lobes are flat, shaped obliquely subtriangular and have rounded to obtuse apices. The side lobes are distinctly shorter than the mid-lobe. The mid-lobe is shaped elliptic and has an obtuse to subacuminate apex. There are two keels that run from base of the labellum and terminate just past the base of the mid-lobe. The column is suberect, incurved and measures 4.3-4.7mm long. The apical wing is prolonged into a rounded apex with an erose-crenate margin. The apical wing distinctly exceeds the anther cap. The column foot is short. The stelidia grow outwards from the top of the column and are distinctly shorter than the column apex. The stelidia are shaped obliquely rhombic and have obtuse to subacute apices.

 

Herbarium Specimens

 

Holotype

 

AMES


Specimen 18829 (photo)

 

 

Other herbarium specimens

 

Royal Botanic Gardens, Kew (K)

 

Specimen 64120.000

Specimen 72719.000

 

NSW

 

PNH

 

Scent

 

Yes, a subtle but sweet scent.

 

Flowering Season

 

Flowering plants have been collected in the wild during May. In European cultivation this plant flowers from late spring to late summer. In Australia this plant flowers during the early summer (Cootes et al 1995).

 

Culture

 

This species is found in cultivation in Europe, Australia, Brazil and the USA.

 

I have noticed that this species is becoming increasingly common in cultivation. This species is often mislabelled as Dendrochilum abbreviatum; Flickr, E-bay and other sources have many mislabelled plants. A Hawaiian seller on e-bay, has recently (2010) been selling this species incorrectly mislabelled as Dendrochilum clemensiae, a synonym of Dendrochilum longifolium. A Belgian e-bay seller has recently been incorrectly selling this plant as Dendrochilum abbreviatum and a French e-bay seller has recently been incorrectly selling this plant as Dendrochilum cobbianum.

 

This species can be grown slightly warmer than many others in the genus.

 

Similar Species

 

Dendrochilum amesianum

Dendrochilum cobbianum

Dendrochilum longifolium

 

Other Information

 

Ames wrote (Ames 1923) that he thought this species was closely allied to Dendrochilum clemensiae (Dendrochilum longifolium). Ames wrote that it differed from Dendrochilum longifolium by the five nerved sepals, terminal stelidia, slightly larger flowers and obtuse side lobes.

 

Jim Cootes and David Banks called this species 'Dendrochilum species "J" in 1995 (Cootes et al). Jim Cootes later wrote that this species was in Australian collections under the name of Dendrochilum cobbianum 'green' (Cootes 2005). Once Henrik Pedersen's enumeration was published in 1997 the 'green' plant was found to be Dendrochilum pangasinanense.

 

Until Jim Cootes observed flowering plants on the island of Cebu in 2000 this species was only scientifically known by the original collection in 1909. Pedersen identified the plants Jim Cootes collected and preserved in alcohol (Cootes 2005).

 

The epithet refers to the Luzon province where the type was collected.

 

Reference -

 

AMES, Oakes. 1923, New and Noteworthy Orchids, Schedulae Orchidianae, No 6. Massachusetts, Boston.

 

COOTES, Jim. BANKS, David. 1995, The genus Dendrochilum a guide to the species in cultivation, Orchids Australia, AOC

 

COOTES, Jim. Dendrochilum pangasinanense, The Orchid Review, March-April 2005 Vol 113 No 1262

 

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

 

PEDERSEN, Henrik. 2001, One new and one rediscovered species of Dendrochilum from the Philippines, Lindleyana 16(4) 231-234.

 

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