Accepted name: Dendrochilum philippinense var. purpureum (Ames) H.A.Pedersen, Opera Bot. 130: 20 (1997)

Subgenus – Acoridium. Section – Acoridium.


 
 

Synonyms

 

Dendrochilum purpureum Ames, Orchidaceae 6: 286 (1920).

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

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

2,000 metres

 

Habitat in the Wild

 

This species has been collected from Mount Pasoan in Kalinga-Apayao.

 

The Plants Description

 

The pseudobulbs measure 1.3-1.6cm long and 0.3-0.5cm in diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate, the petioles measure 2.9-7.2cm long. The leaf blades are shaped lanceolate and have acute apices. The leaf blades measure 7.8-13cm long and 1.4-1.8cm wide. There leaves have five distinct nerves; the two outermost nerves are 1.5-2mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle measures 4.5-19.3cm long. The rachis is nodding and measures 3.6-9.5cm long. The flowers are spaced c2mm apart. There are 3-5 non floriferous bracts. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The flowers are purple. The dorsal sepal is shaped elliptic-oblong and has an acuminate apex. The dorsal sepal measures 4-4.8mm long and 1.7-1.9mm wide. The dorsal sepal has an entire margin and is three veined. The lateral sepals are shaped elliptic-oblong and have acuminate apices. The lateral sepals measure 3.8-4.5mm long and 1.7-2.2mm wide. The lateral sepals have entire margins and are three veined. The petals are shaped broadly elliptic-ovate and have subacuminate apices. The petals measure 3.5-4.7mm long and 2.4-3.3mm wide. The petals have entire margins and are three veined. The labellum is entire and obscurely three veined. The labellum is slightly hastate-auriculate at the base, shaped oblong and has an obtuse apex. The labellum measures 1.6-1.7mm long and 0.8-0.9mm wide. The column measures 0.7-0.9mm long. The anther cap is subquadrate from its upper view and rounded (mildly apiculate) from the front.

 

Herbarium Specimens

 

Holotype

 

AMES

 

Specimen 18844 (photo)

 

 

Isotype

 

New York Botanical Garden (NY)

 

Specimen 39525

 

British Natural History Museum (BM)

 

Bogor (BO)

 

Kew (K)

 

Singapore (SING)

 

P

 

US

 

W

 

Scent

 

I could find no record

 

Flowering Season

 

The type was collected in flower during January

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum marginatum

Dendrochilum rhombophorum

Dendrochilum macgregorii

Dendrochilum foxworthyi

Dendrochilum philippinense var. philippinense (see this page for differences)

 

Other Information

 

Oakes Ames wrote that Dendrochilum purpureum is similar to Dendrochilum philippinense and could only be distinguished by the entire and trowel-shaped labellum and colour. Henrik Pedersen reduced this species as a variety of Dendrochilum philippinense due to this (Pedersen 1997).

 

Reference -

 

AMES, Oakes. 1920, Illustrations and studies of the Family Orchidaceae Facsimile 6 The Orchids of Mount Kinabalu British North Borneo, 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. 30 November 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 30 November 2008.