Accepted name: Dendrochilum vanoverberghii Ames, Philipp. J. Sci., C 7: 27 (1912)



Subgenus – Platyclinis. Section – Convoluta.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

2000 metres

 

Habitat in the Wild

 

This plant has been collected on Mount Polis in Ifugao Province. The habitat has been recorded as mossy forest. Dendrochilum vanoverberghii is an epiphyte and found on mossy tree trunks and branches (Cootes 2001).

 

The Plants Description

 

The pseudobulbs cluster along a short rhizome and are shaped fusiform to ellipsoid. The pseudobulbs measure 0.9-1.7cm long and 0.2-0.4cm diameter. The pseudobulbs are covered by c4 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.3-0.8cm long. The leaf blades are shaped narrowly linear and have acute apices. The leaf blades measure 4.1-8.6cm long and 0.2cm wide. The leaves have one distinct nerve.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect to curved and measures 6.6-9cm long. The rachis is nodding and probably pendent and measures 3.0-6.4cm long. The flowers alternate distichously and are spaced 2-3mm apart. There are 2-3 appressed non-floriferous bracts at the base of the rachis. It is not known what section of the rachis the flowers open from.

 

The Flowers

 

The flowers are a pale yellow colour and have a red labellum. Up to 20 flowers can grow on an inflorescence. The sepals and petals spread widely. The dorsal sepal is shaped oblong and has a subacute apex. The dorsal sepal measures 2.3-2.5mm long and 0.7-0.9mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped obliquely ovate and have subacute to slightly carinate apices. The lateral sepals measure 2.0-2.2mm long and 1.3-1.5mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped slightly oblique and oblanceolate and have acuminate apices. The petals measure 2.1-2.3mm long and 0.7-0.9mm wide. The petals are three veined and have entire margins. The labellum is porrect and 3-lobed. The labellum measures 1.3-1.4mm long and 2.7-3.0mm wide. The labellum is obscurely three veined, glabrous and has entire margins. The side lobes are erect, shaped broadly and falcately oblong and have obtuse to acuminate apices. The side lobes are shorter than the mid-lobe. The mid-lobe is shaped transversely rectangular and has a truncate apex that is apiculate in its centre. There are two calli located at the base of the hypochile and close to the margin. The column is suberect to slightly incurved and measures 0.9-1.0mm long. The column is hooded at its apex. Stelidia and column foot are absent.

 

Herbarium Specimens

 

Lectotype

 

AMES


Specimen 18852 (photo)

 

Isolectotype

 

Specimen 18853 (photo)

 

Isotype

 

Philippine National Herbarium (PNH)

 

Specimen – destroyed

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild from November to February. I know of plants in cultivation in the United States of America and Australia.

 

Culture

 

This species is in cultivation but hard to find.

 

Similar Species

 

Dendrochilum exile

Dendrochilum mindorense

 

Other Information

 

Ames and L.O. Williams wrote that this species was closely allied to Dendrochilum exile. Henrik Pedersen wrote that this species is quite isolated but closer to Dendrochilum mindorense.

 

The epithet refers to a Belgian Priest, Morice Vanoverbergh who worked with tribes in central Luzon (Cootes 2001).

 

Reference

 

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

 

World Checklist of Selected Plant Families. 14 April 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 14 April 2009.