Accepted name: Dendrochilum propinquum Ames, Orchidaceae 6: 286 (1920).

Subgenus – Platyclinis. Section – Eurybrachium.


 
 
 

Synonyms

 

None

 

Origin in the Wild

 

Luzon and Leyte

 

Elevation in the Wild

 

500-700 metres

 

Habitat in the Wild

 

On Luzon this species has been collected in Albay Province on the Mayon Volcano and on Mount Malinao. On Leyte this species has been found at Buenavista and Masaganap near Jaro and on Mount Suiro’s northern slope. Wenzel’s field notes described this plant as an epiphyte in forest.

 

The Plants Description

 

The pseudobulbs cluster along a short rhizome. The pseudobulbs are shaped pyriform to slenderly subfusiform. The pseudobulbs measure 1.3-5.2cm long and 0.2-0.9cm in diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 1.2-6.6cm long. The leaf blades are shaped lanceolate and have obtuse to subacute or somewhat acuminate apices. The leaf blades measure 7.1-21.0cm long and 1.7-4.6cm wide. The leaves are thin textured and have 5-7 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 10.4-25.5cm long. The rachis is nodding to pendent and measures 6.5-16.3cm long. The flowers alternate distichously and are spaced 1.5-2.0mm apart; the rachis twists to form a cylindrical spiral. There is one appressed non-floriferous bract at the base of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

Wenzel’s field notes described the colour as yellow. Henrik Pedersen wrote that the flower colour is red or yellow (Pedersen 1997). The sepals and petals spread widely and contain a few ocelli. The dorsal sepal is shaped elliptic to oblong and has an obtuse apex. The dorsal sepal measures 4.2-5.4mm long and 1.7-2.1mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped elliptic to somewhat ovate and have obtuse to subacute apices sometimes finely mucronate. The laterals measure 4.1-4.6mm long and 1.9-2.1mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped elliptic and have rounded to acute apices. The petals measure 3.4-4.8mm long and 1.5-2.3mm wide. The petals are three veined and have entire margins. The labellum is porrect but gradually recurved and entire. The labellum is shaped broadly elliptic to ovate and has a rounded to obtuse apex that is finely apiculate in its centre. The labellum measures 3.2-4.4mm long and 2.1-2.8mm wide. The labellum is three veined and has an entire margin. The labellum has a few scattered ocelli and no ornaments. The column is suberect or straight and measures 1.8-2.1mm long. The apical hood is prolonged into a rounded few dentate apex and it exceeds the anther cap. The stelidia grow upwards from the top of the column and slightly exceed the apical hood. The stelidia are shaped obliquely-oblong and have rounded or obtuse apices.

 

Herbarium Specimens

 

Holotype

 

AMES

 

Specimen 18832 (photo)

 

 

Isotype

 

Royal Botanic Gardens, Kew (K)

 

I could not locate the specimen

 

 

Other herbarium Specimens

 

National Herbarium Netherlands (L)

 

Specimen L0322701

Specimen L0322702

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected in the wild during February, March and December.

 

Culture

 

This species is in cultivation but very difficult to find. I know there are a couple of plants in Europe. The plants I know of were unidentified species initially.

 

There are pictures on the internet labelled as this species but they are not and are of something else.

 

Similar Species

 

Dendrochilum ecallosum (see this page for differences)

Dendrochilum convallariaeforme

 

Other Information

 

Ames wrote that this species is a near ally of Dendrochilum bicallosum (D. convallariaeforme) but differs by the ecallose labellum which looks like its petals.

 

Henrik Pedersen grouped this species is with Dendrochilum convallariaeforme and Dendrochilum ecallosum and wrote that it differs from the D. graciliscapum group by not having the transverse callus at the base of the labellum (Pedersen 1997).

 

Reference

 

AMES, Oakes. 1920, Illustrations and studies of the Family Orchidaceae Facsimile 6 The Orchids of Mount Kinabalu British North Borneo, Ames Botanical Laboratory, North Easton, Massachusetts, Boston.

 

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

 

World Checklist of Selected Plant Families. 08 January 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 08 January 2009.