Accepted name: Dendrochilum foxworthyi Ames, Orchidaceae 3: 8 (1908)

Subgenus – Acoridium. Section – Acoridium.


 
 
 

Synonyms

 

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

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

1800 – 2042 metres

 

Habitat in the Wild

 

This Luzon endemic has been recorded from Ifugao Province on Mount Polis; Pampanga Province on Mount Pinatubo and Quezon Province on Mount Camatis. This species is recorded as growing as an epiphyte in mossy cloud forest. F.W. Foxworthy’s field notes of the Mount Pinatubo specimen (no 2542) state “This is the most prominent thing on top of the mountain. It covers the mossy tree trunks very densely. The leaves are a rather dark shiny green”

 

Ames wrote that it is an epiphyte from mountain tops.

 

The Plants Description

 

This Dendrochilum is medium sized and tufted. The pseudobulbs cluster on a short rhizome and are shaped fusiform to ellipsoid. The pseudobulbs measure 1.2-3.2cm long and 0.2-0.3cm in diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate, the petiole measures 1-5cm long. The leaves are coloured dark shiny green. The leaf blades are shaped linear-lanceolate and have obtuse to finely mucronate apices. The leaf blades measure 3.7-14.5cm long and 0.3-0.6cm wide. The leaves have 3 distinct nerves; the 2 outermost nerves are submarginal.

 

The Inflorescence

 

The inflorescence is synanthous and is free from the subtending leaf at the time of flowering.  The peduncle is suberect and measures 6.3-18.8cm long. The rachis is nodding and measures 3-9.2cm long. The flowers are spaced 2mm apart. The flowers open from the proximal end of the rachis.

 

The Flowers

 

Ames wrote that about 30 flowers grow on an inflorescence (Ames 1908). The flower is mainly yellow and greenish-yellow; sometimes the labellum is tinged with brown. The dorsal sepal is shaped oblong and has a subacute to rounded apex, sometimes minutely mucronate. The dorsal sepal measures 1.6-2.6mm long and 0.7-1.1mm wide. The dorsal sepal has an entire margin and is three veined. The lateral sepals are somewhat oblique and are shaped oblong-elliptic the apices are obtuse to acute, sometimes minutely carinate. The lateral sepals measure 1.7-2.7mm long and 1-1.3mm wide. The lateral sepals have entire margins and are three veined. The petals are shaped obovate and have rounded to obtuse apices. The petals measure 1.5-2.5mm long and 1-1.5mm wide. The petals have entire margins and are three veined. The labellum is porrect, entire and sometimes can be clawed. The labellum is shaped oblong to broadly cordate and has an obtuse, sometime apiculate apex. The labellum measures 1.3-1.5mm long and 0.9-1.8mm wide. The labellum is 3-veined, glabrous and has entire margins. There are 2 tiny lateral calli that look like swellings, there is no median calli. The column is suberect and nearly straight and measures 0.7-1mm long. The column does not have an apical hood. The anther cap is sub quadrangular from the upper view and truncate from the front.

 

Herbarium Specimens

 

Lectotype

 

AMES

Specimen 18859 (photo)

 

Isotype

 

Royal Botanic Gardens Kew (K)

 

I could not find the specimen

 

Philippine National Herbarium (PNH)

 

Specimen – destroyed

 

SING

 

US

 

Other herbarium specimens

 

National Herbarium Netherlands, Leiden (L)

Specimen L0322480

Specimen L0322481

Specimen L0322482

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild from March to May.

 

Culture

 

I do not think this species is in cultivation. If this species is in cultivation it could be labelled as something else.

 

Similar Species

 

Dendrochilum marginatum

Dendrochilum philippinense

Dendrochilum rhombophorum

Dendrochilum macgregorii

 

Other Information

 

Henrik Pedersen considered this species is similar to those above because, the peduncle is free from the leaf at the time of flowering (except D. philippinense), an entire labellum and obscure calli. L.O Williams considered this species to be closely related to D. rhombophorum. Henrik Pedersen considers this species to be closet to D. macgregorii because of the appearance of the calli.

 

Ames wrote “A wide range of variation is noticeable in the material gathered by Foxworthy on Mount Pinatubo, some of the specimens being twice as tall as others, but no corresponding variation that I have been able to discover occurs in the flowers of the extremes” (Ames 1908).

 

Reference

 

AMES, Oakes. 1908, Illustrations and studies of the Family Orchidaceae Facsimile 3, 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. 18 January 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 18 January 2008.