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

Subgenus – Acoridium. Section – Convoluta.



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




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


Origin in the Wild




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






Specimen 1026 (photo)






Specimen 1027 (photo)


Other herbarium specimens


Natural History Museum (BM)


Specimen 3193




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






Flowering Season


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




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.




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; accessed 17 January 2009.