Accepted name: Dendrochilum mindorense Ames, Orchidaceae 2: 91 (1908)

Subgenus – Acoridium. Section – Convoluta.


 
 
 

Synonyms

 

Acoridium mindorense (Ames) Ames, Orchidaceae 7: 81 (1922).

 

Origin in the Wild

 

Mindoro

 

Elevation in the Wild

 

860-1995 metres

 

Habitat in the Wild

 

E.D Merrill collected the type specimen plant on Mount Halcon in 1906. Further plants have collected on Mount Ilong on Mindoro. There is nothing recorded on the habitat other than Ames mentioning that the plant is found as an epiphyte in forests (Ames 1907).

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome and are shaped fusiform-terete. The pseudobulbs measure 2.0-4.2cm long and 0.2-0.4cm 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 1.5-3.1cm long. The leaf blades are shaped lanceolate and have obtuse apices that are sometimes minutely mucronate. The leaf blades measure 7.2-16cm long and 1.3-2.4cm wide. The leaves are thin textured and have five distinct nerves, the two outermost nerves 1-2mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect to curved and measures 4.9-7.8cm long. The rachis is nodding and measures 4.3-6.6cm long. The flowers alternate distichously and are spaced 2mm apart. There is one appressed non-floriferous bract at the base of the rachis. The flowers open at the same time.

 

The Flowers

 

The flowers are greenish yellow. The sepals and petals spread widely. The dorsal sepal is shaped elliptic-oblong and has an obtuse to acute apex. The dorsal sepal measures 4.5-6mm long and 1.8-2.3mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are slightly oblique, shaped ovate to elliptic and have subacuminate to acute apices that are slightly carinate. The lateral sepals measure 4.8-5.2mm long and 1.8-2.9mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped obliquely obovate and have obtuse to acute apices. The petals measure 4.3-5.1mm long and 2.3-2.6mm wide. The petals are three veined and have entire or sometimes irregular margins. The labellum is porrect and 3-lobed. The labellum measures 1.4-1.6mm long and 2.0-2.2mm wide. The labellum is obscurely three veined, glabrous and has entire margins. The side lobes are erect, crescent shaped and have obtuse to subacuminate apices. The side lobes are subequal to the mid-lobe. The mid-lobe is shaped triangular-oblong to ovate and has an obtuse to subacute apex. There are three calli, the lateral calli are located at the base of the side lobes and crescent shaped. The median callus is shaped oblongoid and is located at the centre of the hypochile. The column is suberect to somewhat incurved and measures 0.7-1.1mm long. The column is hooded at its apex. Stelidia and column foot are absent.

 

Herbarium Specimens

 

Lectotype

 

AMES

 

Specimen 40 (photo)

 

 

Isotype

 

Royal Botanic Garden, Kew (K)

 

I could not locate a specimen

 

SING

 

US

 

Scent

 

No

 

Flowering Season

 

Flowering plants have been collected in the wild during November.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum vanoverberghii

Dendrochilum affine

Dendrochilum irigense

Dendrochilum exile

Dendrochilum longibulbum

Dendrochilum pumilum

 

Other Information

 

Ames wrote that this species is allied to Dendrochilum recurvum (Dendrochilum pumilum var recurvum) but differs by its labellum. L.O. Williams agreed with Ames. Henrik Pedersen wrote that this species is closely related to Dendrochilum irigense on account of its furrowed pseudobulbs, thin textured leaves, few flowered inflorescence and a transversely E shaped labellum.

 

Reference -

 

AMES, Oakes. 1907, Orchidaceae Halconenses: An Enumeration of the Orchids Collected on and Near Mount Halcon, Mindoro, Chiefly By E.D. Merrill, Bureau of Printing, Manila.

 

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. 01 November 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 01 November 2008.