Accepted name: Dendrochilum affine Ames, Orchidaceae 2: 95 (1908).

Subgenus – Acoridium. Section – Convoluta.

 

 

This drawing is by Oakes Ames and is from the Syntype.

 

Synonyms

 

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

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

950-1130 metres

 

Habitat in the Wild

 

This species has been collected along the Lamao River on Mount Mariveles and in the Lamao Forest Reserve. Foxworthy wrote in his field notes that the flowers were found on mossy tree trunks.

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome and are shaped slenderly fusiform. The pseudobulbs measure 1.2-2.7cm long and 0.2-0.3cm diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls soon disintegrate into non-persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.5-1.2cm long. The leaf blades are shaped lanceolate and have subacute to obtuse apices. The blades measure 3.4-7.2cm long and 0.6-0.9cm wide. The leaves are thin textured to slightly leathery with 3 distinct nerves on the blade, the 2 outermost nerves 0.5-1mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 1.6-3.4cm long. The rachis is nodding and measures 2.0-3.3cm long. The flowers alternate distichously and are spaced 3-4.5mm apart. There is 1 appressed non-floriferous bract at the base of the rachis. The flowers open from the distal section of the rachis.

 

The Flowers

 

Ames described, from the field notes of F. W. Foxworthy, that the flowers are a lemon yellow colour (Ames 1908). Henrik Pedersen wrote that between 6 and 10 flowers grow on an inflorescence (Pedersen 1997). The sepals and petals spread widely. The dorsal sepal is shaped oblanceolate and has a obtuse to nearly acute apex. The dorsal sepal measures 3.9-5.2mm long and 1.6-1.8mm wide. The dorsal sepal is 3 veined and has entire margins. The lateral sepals are shaped obliquely elliptic with obtuse to acute apices. The laterals measure 4.0-4.9mm long and 2.0-2.2mm wide. The lateral sepals are 3 veined and have entire margins. The petals are somewhat oblique and are shaped trulliform-spathulate with rounded to obtuse apices. The petals measure 3.6-5.3mm long and 2.3-3.2mm wide. The petals are 3 veined and have entire margins. The labellum is porrect and 3-lobed. The labellum measures 1.5-1.8mm long and 1.8-2.3mm wide. The labellum is 3-veined, glabrous and has entire margins. The side lobes are erect, falcately oblong shaped with rounded apices shorter than the mid-lobe. The mid-lobe is shaped cordate with a subacuminate apex. There are 3 calli, the lateral calli are located at the base of the side lobes close to the front margin. The median callus is shaped oblongoid and is located at the centre of the hypochile. The column is suberect, it measures 0.8-1.2mm long. The column is hooded at its apex. Stelidia and column foot are absent.

 

Herbarium Specimens

 

Lectotype

 

AMES

 

Specimen 1026 (photo)

 

Syntype

 

AMES

 

Specimen 1027 (photo)

 

Other herbarium specimens

 

Natural History Museum (BM)

 

Specimen 3193

 

AMES

 

Specimen 23 (photo) (specimen on same sheet as specimen 1026)

 

Scent

 

No

 

Flowering Season

 

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

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum pumilum

Dendrochilum irigense (see this page for differences)

Dendrochilum mindorense

 

Other Information

 

Ames recognised that this species was closely related to Dendrochilum pumilum and Dendrochilum simulacrum. This species differs from D. pumilum and D. simulacrum because it has a longer mid-lobe. Henrik Pedersen wrote that this species is closer to Dendrochilum mindorense and Dendrochilum irigense. Pedersen wrote that he could see no direct connection to Dendrochilum simulacrum.

 

Reference

 

AMES, Oakes. 1908, Illustrations and studies of the Family Orchidaceae Facsimile 2, 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. 17 January 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 17 January 2009.