Accepted name: Dendrochilum elmeri Ames, Leafl. Philipp. Bot. 5: 1558 (1912)



Subgenus – Platyclinis. Section – Mindanaorchis.


 
 

Synonyms

 

Acoridium elmeri (Ames) Ames, Orchidaceae 7: 80 (1922).

 

Origin in the Wild

 

Mindanao

 

Elevation in the Wild

 

2300-2465 metres

 

Habitat in the Wild

 

Plants have been collected from Mindanao on Mount Apo and Mount McKinley in Davao del Sur Province.

 

This species has been found growing in clumps of moss on tree branches.

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome. The pseudobulbs are shaped fusiform. The pseudobulbs measure 1.6-2.3cm long and 0.4-0.7cm in diameter. The pseudobulbs are dull green or brown. 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 3.0-8.2cm long. The leaf blades are shaped lanceolate and have acute apices. The leaf blades measure 13.1-21.0cm long and 2.1-3.3cm wide. The leaves are coriaceous, thin textured and have 5-7 distinct nerves.

 

Herbarium Specimens

 

Holotype

 

AMES

 

Specimen 18872 (photo)

 

Isotype

 

New York Botanical Garden (NY)

 

Specimen 39521 (photo)

 

AMES

 

Specimen 18873 (photo)

 

Other herbarium specimens

 

National Herbarium Netherlands, Leiden (L)

 

Specimen L0322472

 

Scent

 

No

 

Flowering Season

 

Flowering plants have been collected in the wild during May and September.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 19-20cm long. The rachis is nodding and measures c7.9cm long. The flowers alternate distichously and are spaced 3.0-4.0mm 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 (1997) that the flower colour is yellow to dark yellow. The sepals and petals are reflexed. The dorsal sepal is shaped elliptic-oblong and has an obtuse to subacute apex. The dorsal sepal measures 5.3-6.0mm long and 2.0-2.3mm wide. The dorsal sepal is three veined and has entire margins. The lateral sepals are shaped oblong and have obtuse apices. The lateral sepals measure 5.2-6.1mm long and 2.0-2.2mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped elliptic and have obtuse apices. The petals measure 5.2-5.4mm long and 2.7-2.8mm wide. The petals are three veined and have entire margins. The labellum is porrect and entire. The labellum is shaped orbicular and has a rounded-obtuse apex. The labellum measures 5.7-7.1mm long and 5.5-6.0mm wide. The labellum is five to seven veined and has entire to slightly crenate margins, the lateral margins incurve. There are two obscure swellings at the base of the hypochile. The column is slightly incurved and measures 2.2-2.5mm long. The column foot is strongly concave. The apical hood is prolonged into a rounded quite entire apex which distinctly exceeds the anther cap. The stelidia grow upwards from the top of the column and are equal to the column apex. The stelidia are shaped obliquely-oblong and have rounded apices.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

None

 

Other Information

 

Oakes Ames considered this species to be closely related to Dendrochilum turpe and L.O. Williams placed this species in Acoridium stating that it was close to Dendrochilum irigense.

 

Henrik Pedersen placed (1997) this species in Platyclinis on account of its stelidia and distinct apical hood. Pedersen placed this species along with Dendrochilum longilabre in section Mindanaorchis because of its deeply concave column foot.

 

Reference -

 

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

 

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