Accepted name: Dendrochilum eximium (Ames) L.O.Williams, Philipp. J. Sci. 80: 327 (1952)


Subgenus – Acoridium. Section – Convoluta.


 
 
 

Synonyms

 

Acoridium eximium Ames, Blumea, Suppl. 1: 70 (1937).

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

I could find no record.

 

Habitat in the Wild

 

Plants have been collected from Rizal Province on Montalban and Paningtingan near Montalban.

 

Nothing is recorded about the habitat of this species.

 

The Plants Description

 

The pseudobulbs are shaped slenderly obpyriform-terete. The pseudobulbs measure c3.0cm long and c0.5cm diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. I do not know if the cataphylls disintegrate into persistent or non-persistent fibres as the pseudobulbs mature. The leaves are petiolate; the length of the petiole is unknown. The leaves measure 7.0-11.0cm long, including the petiole and 0.6-1.3cm wide. The leaf blades are shaped lanceolate. There are 3-5 distinct nerves on the blade, the 2 lateral nerves are 1mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect to curved and measures 5.6-11.5cm long. The rachis is nodding to pendent and measures 4.9-7.0cm long. The flowers alternate distichously and are spaced 3.0-4.0mm 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

 

I could not find a reference to the colour of the flower. Henrik Pedersen wrote that between 13 and 20 flowers grow on the inflorescence. The sepals and petals spread widely. The dorsal sepal is shaped elliptic and has an obtuse to subacuminate apex. The dorsal sepal measures 4.2-5.1mm long and 1.6-2.1mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped slightly oblique and ovate and have acuminate apices. The lateral sepals measure 4.3-4.6mm long and 1.9-2.1mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped elliptic and have acuminate apices. The petals measure 3.9-4.4mm long and 1.8-2.0mm wide. The petals are three veined and have entire margins. The labellum is porrect and 3-lobed. The labellum measures 0.7-0.8mm long and 1.8-2.2mm wide. The labellum is obscurely one veined, glabrous and has entire margins. The side lobes are suberect or spreading, shaped flabellate and have rounded apices. The side lobes are shorter than the mid-lobe. The mid-lobe is shaped cruciform and has an obtuse apex. There are 3 tiny calli located on the disc, the lateral calli are located at the base of each side-lobe, the median callus is a swelling and centrally located. The column is suberect to slightly incurved and measures 0.5-0.8mm long. The column is hooded at its apex. Stelidia and column foot are absent.

 

Herbarium Specimens

 

Holotype

 

AMES

 

Specimen 28 (photo)

 

Isotype

 

Philippine National Herbarium, (PNH)

 

Specimen – destroyed

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild during September.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum hutchinsonianum

 

Other Information

 

Henrik Pedersen wrote that this plant is allied to Dendrochilum hutchinsonianum and together they represent a link between Dendrochilum curranii and the D. turpe group. Pedersen also commented that Dendrochilum eximium has a habit closely allied to the D. turpe group and Dendrochilum hutchinsonianum has a habit similar to D. irigense and the D. mindorense group (Pedersen 1997).

 

Reference

 

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

 

World Checklist of Selected Plant Families. 19 March 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 19 March 2009.