Accepted name: Dendrochilum hutchinsonianum Ames, Orchidaceae 2: 96 (1908)

Subgenus – Acoridium. Section – Convoluta.


 
 

Synonyms

 

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

Acoridium hutchinsonianum (Ames) Ames in E.D.Merrill, Enum. Philipp. Fl. Pl. 1: 286 (1924).

 

Origin in the Wild

 

Mindoro

 

Elevation in the Wild

 

1524-2660 metres

 

Habitat in the Wild

 

Ames wrote (1908) that this species was found by E.D. Merrill as an epiphyte in mossy thickets on Mount Halcon's exposed ridges. Ames also mentioned that this species grows as a terrestrial (Ames 1907).

 

The Plants Description

 

The pseudobulbs cluster on a short to slightly elongate rhizome and are shaped terete. The pseudobulbs measure 4.8-8.1cm long and 0.2-0.5cm 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 2.6-3.5cm long. The leaf blades are shaped narrowly lanceolate and have subacute apices. The leaf blades measure 12.3-16.8cm long and 1.9-2.2cm wide. The leaves have 5 distinct nerves; the 2 lateral nerves are 1mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect to curved and measures 3.0-4.8cm long. The rachis is nodding, probably pendent and measures 3.6-5.5cm long. The flowers alternate distichously and are spaced 4-4.5mm apart. There are 1-3 appressed non-floriferous bracts at the base of the rachis. It is not known what section of the rachis the flowers open from.

 

The Flowers

 

The flowers are a salmon-pink colour and number 8 to 12 on an inflorescence. The sepals and petals spread widely. The dorsal sepal is shaped oblong and has a rounded apex. The dorsal sepal measures 5.1-5.7mm long and 2.5-2.7mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped somewhat oblique, ovate and have obtuse apices. The lateral sepals measure 4.5-5.5mm long and 3.0-3.6mm wide. The lateral sepals are 3-4 veined and have entire margins. The petals are shaped broadly obovate and have rounded apices. The petals measure 4.5-5.4mm long and 3.8-3.9mm wide. The petals are three veined and have entire margins. The labellum is porrect, concave and 3-lobed. The labellum measures 1.7-1.8mm long and 2.4-3.3mm wide. The labellum is obscurely 3-veined, glabrous and has entire margins. The side lobes are erect, outcurve, crescent shaped with obtuse to subacute apices. The side lobes are equal in length to the mid-lobe. The mid-lobe is shaped broadly spathulate and has a rounded apex that is apiculate in its centre. There are three calli located on the disc; the lateral calli are located at the base of each side-lobe; the median callus is oblongoid and centrally located. The column is suberect to straight and measures 1.1-1.5mm long. The column is not hooded at its apex. Stelidia and column foot are absent.

 

Herbarium Specimens

 

Holotype

 

Philippine National Herbarium (PNH)

 

Specimen - destroyed

 

Isotype

 

AMES

 

Specimen 18834 (photo)

 

Royal Botanic Gardens, Kew (K)

 

I could not locate the specimen.

 

US

 

Scent

 

Ames wrote that this species does not have a scent.

 

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 irigense (see this page for differences)

Dendrochilum eximium

 

Other Information

 

Ames wrote in his facsimile 2 that this species belongs in a same group as Dendrochilum philippinense, D. pumilum and D. recurvum. Ames wrote that the elongated pseudobulbs and short peduncle make it distinguishable from the others. Dendrochilum philippinense is now considered to be in section Acoridium.

 

L.O. Williams wrote that it was closer to Dendrochilum irigense. Henrik Pedersen agreed that there was a similarity to Dendrochilum pumilum and Dendrochilum irigense. Pedersen wrote that this species is closest to Dendrochilum eximium.

 

This species is only known from the type collection.

 

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. 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.