Accepted name: Dendrochilum convallariaeforme var. minor (Ames) H.A.Pedersen, Opera Bot. 130: 34 (1997)



Subgenus – Platyclinis. Section – Eurybrachium.


 
 
 

Synonyms

 

Dendrochilum bicallosum var. minor Ames, Orchidaceae 2: 118 (1908).

Dendrochilum confusum Ames, Philipp. J. Sci., C 6: 41 (1911).

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

 

Origin in the Wild

 

Luzon, Mindoro and Leyte

 

Elevation in the Wild

 

700-830 metres

 

Habitat in the Wild

 

On Luzon this species has been collected in Laguna Province on Mount Maquiling and in Sorsogon on the Bulusan Volcano. On Leyte this species has been collected at Masaganap near Jaro.

 

Ames described this plant as growing on a ledge in ridge forest on Mount Halcon, Mindoro (Ames 1907).

 

The Plants Description

 

The pseudobulbs cluster on a short to slightly elongate rhizome. The pseudobulbs are shaped fusiform to somewhat obpyriform. The pseudobulbs measure 1.7-2.6cm long and 0.3-0.6cm in diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.7-3.7cm long. The leaf blades are shaped lanceolate to narrowly elliptic and have obtuse to somewhat acuminate apices. The leaf blades measure 7.1-11.2cm long and 1.9-3.3cm wide. The leaves are thin textured and have 3-7 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 3.6-12.6cm long. The rachis is pendent and measures 4.3-8.2cm long. The flowers alternate distichously and are spaced 1.0-2.0mm apart; the rachis twists to form a cylindrical spiral. There is one appressed non-floriferous bract at the base of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The flower colour is salmon pink. The sepals and petals spread widely. The dorsal sepal is shaped oblong and has an obtuse to subacute apex. The dorsal sepal measures 3.0-3.8mm long and 1.3-1.7mm wide. The dorsal sepal is three veined and has entire margins. The lateral sepals are shaped slightly oblique, oblong and have obtuse to acuminate apices. The laterals measure 3.3-3.5mm long and 1.3-1.8mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped elliptic and have obtuse apices. The petals measure 2.6-3.8mm long and 1.3-1.5mm wide. The petals are three veined and have entire margins. The labellum is pendent and entire. The labellum is shaped obovate to obtuse to an abruptly acuminate apex. The labellum measures 2.6-2.8mm long and 1.7-1.9mm wide. The labellum is three veined and has entire margins. The labellum can have a few scattered ocelli that if present are found around the margin. The column is suberect or straight and measures 1.8-2.0mm long. The apical hood is prolonged into a rounded apex with an irregular to finely erose margin. The stelidia grow upwards from the top of the column and are almost equal to the apical hood. The stelidia are shaped linear-triangular, often slightly falcate with acute apices.

 

Herbarium Specimens

 

Holotype

 

Philippine National Herbarium, (PNH)

 

Specimen - destroyed

 

AMES

 

Specimen 18862 (photo) (Dendrochilum confusum)

 

Other herbarium specimens

 

Kew Botanical Gardens (K)

 

Specimen 71184.000

Specimen 70871.000

 

National Herbarium Netherlands, Leiden (L)

 

Specimen L0269525

 

Scent

 

Ames wrote that the plant was odourless (Ames 1907) and I have not detected a scent on my plant.

 

Flowering Season

 

Flowering plants have been collected in the wild during February, May and November.

 

Culture

 

This species is common in cultivation worldwide. It can be grown slightly warmer than many other species.

 

Similar Species

 

Dendrochilum copelandii

Dendrochilum ecallosum (see this page for differences)

Dendrochilum propinquum (see this page for differences)

Dendrochilum convallariaeforme var convallariaeforme

 

Other Information

 

Ames wrote of Dendrochilum confusum “This is the small flowered plant which I described in Orchidaceae II as Dendrochilum bicallosum var minor. More material has come to hand which necessitates a revision of my former views. Having compared the type location and other sparse material of Dendrochilum confusum to Dendrochilum convallariaeforme, however I reached the contrasting result that only the size of the flowers seems to represent a consistent difference between the two taxa. Due to the inclusion of Dendrochilum bicallosum as a synonym under Dendrochilum convallariaeforme, it thus become necessary to publish the new combination D. convallariaeforme var. minor”.

 

This species differs from var convallariaeforme by a different shaped, smaller labellum and dense rachis.

 

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.

 

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

 

World Checklist of Selected Plant Families. 24 July 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 24 July 2009.