Accepted name: Dendrochilum hastatum Ames, Orchidaceae 2: 99 (1908)

Subgenus – Platyclinis. Section – Eurybrachium.


 
 

Synonyms

 

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

 

Origin in the Wild

 

Mindoro and Visayas Antique

 

Elevation in the Wild

 

1,440-2,072 metres

 

Habitat in the Wild

 

So far this species has only been collected on Mount Halcon on Mindoro and on Mount Madia-as on Visayas Antique. E.D. Merrill's notes stated that this species was found growing as a terrestrial and on the bases of trees. This species is also found as an epiphyte in ridge forest.

 

The Plants Description

 

The pseudobulbs cluster and are spaced up to 1cm apart on a slightly elongate rhizome. The pseudobulbs are shaped fusiform. The pseudobulbs measure 0.5-1.2cm long and 0.2-0.3cm in diameter. The pseudobulbs are covered by c5 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.9-1.9cm long. The leaf blades are convolute, shaped oblanceolate to elliptic and have obtuse apices. The leaf blades distinctly narrow 1/5 or 1/7 from the apex. The leaf blades measure 2.6-6.0cm long and 0.7-1.5cm wide. The leaves are thin textured and have 3 distinct nerves on the blade.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect to somewhat curved and measures 2.0-7.6cm long. The rachis is nodding to pendent and measures 1.2-2.5cm long. The flowers alternate distichously and are spaced 2-3mm apart. There is one appressed non-floriferous bract at the base of the rachis. The flowers open from the distal section of the rachis.

 

The Flowers

 

Ames described the flower colour as pale purplish (Ames 1908). Henrik Pedersen wrote that between 5 and 11 flowers grow on an inflorescence (Pedersen 1997). The sepals and petals spread widely. The dorsal sepal is shaped broadly lanceolate and has an acuminate apex. The dorsal sepal measures 2.9-3.4mm long and 1.0-1.2mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped broadly lanceolate and have acuminate apices. The lateral sepals measure 2.8-3.3mm long and 1.2-1.4mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped linear and have acute apices. The petals measure 2.2-2.7mm long and 0.5-0.6mm wide. The petals are three veined and have entire margins. The labellum is pendent and 3-lobed. The labellum measures 1.9-2.5mm long and 1.9-2.5mm wide. The labellum is 3-veined and has entire margins. The side lobes spread widely; are shaped triangular and have acute apices. The side lobes are distinctly shorter than the mid-lobe. The mid-lobe is large, shaped oblong and has an acute apex that is recurved. There are no ornaments on the labellum. The column is straight to somewhat incurved and measures 0.8-1.0mm long. The column apex is smooth, distally prolonged, entire and rounded. The column apex slightly exceeds the anther cap. Stelidia and column foot are absent.

 

Herbarium Specimens

 

Lectotype

 

AMES

 

Specimen 1028 (photo)

 

Syntype

 

AMES

 

Specimen 34 (photo)

Isotype

 

BO

 

Royal Botanic Gardens, Kew (K)

 

I could not locate the specimen

 

SING

 

US

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild during April, June and November.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum merapiense

 

Other Information

 

Ames wrote that this species differs from all others described in the Philippines because of its hastate labellum (Ames 1908).

 

L.O. Williams placed this species in subgenus Acoridium. Henrik Pedersen (1997) placed it in subgenus Platyclinis. This species has a column apex that is dilated rather than prolonged beyond the anther cap; Pedersen wrote that this species is better placed in subgenus Platyclinis.

 

Pedersen suggested that this species looks similar to Dendrochilum merapiense from Sumatra on account of the outline of the labellum; however Dendrochilum merapiense's column has a different morphology (Pedersen 1997).

 

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.