Accepted name: Dendrochilum croceum H.A.Pedersen, Orchid Rev. 113: 286 (2005).

Subgenus – Acoridium. Section – Convoluta.


 
 
 

Synonyms

 

None

 

Origin in the Wild

 

Luzon (Jim Cootes pers comm.)

 

Elevation in the Wild

 

750 metres (Jim Cootes pers comm.)

 

Habitat in the Wild

 

This species is an epiphyte from Laguna Province (Jim Cootes pers comm.).

 

The Plants Description

 

The pseudobulbs cluster on the short rhizome and are shaped slenderly fusiform. The pseudobulbs measure 2.3-3.5cm long and 0.3cm in diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls soon disintegrate into non persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.9-1.2cm long. The leaf blades are shaped linear-lanceolate and have subacute apices. The leaves measure 4.8-6.3cm long and 0.7-1.0cm wide.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 2.8-4.3cm long. The rachis is quadrangular in cross section, nodding and measures 3.0-3.8cm long. The flowers alternate distichously and are spaced 2-3mm apart. There are 4-5 appressed non-floriferous bracts at the base of the rachis. The flowers open from the distal section of the rachis.

 

The Flowers

 

Henrik Pedersen wrote (Pedersen 2005) that between 12 and 14 flowers grow on an inflorescence. Pedersen’s description also states that the flowers are a bright saffron-yellow colour.  The sepals and petals open widely. The dorsal sepal is shaped oblanceolate-oblong and has an acuminate apex that is hooded. The dorsal sepal measures 3.9–4.1mm long and 1.4-1.5mm wide. The dorsal sepal is 3 veined and has an entire margin. The lateral sepals are shaped obliquely and narrowly obovate and have subacuminate apices. The lateral sepals measure 3.5-3.7mm long and 1.5-1.7mm wide. The lateral sepals are 3 veined and have entire margins. The petals are recurved, shaped obliquely obovate and have subacuminate apices. The petals measure 3.2-3.4mm long and 1.9-2.1mm wide. The petals are 3 veined and have entire margins. The labellum is porrect and 3-lobed. The labellum measures 1.0-1.1mm long and 1.5mm wide. The labellum is obscurely 3-veined, glabrous and has entire margins. The side lobes are erect, shaped obliquely and transversely rectangular and have truncate apices. The side lobes are shorter than the mid-lobe. The mid-lobe is shaped transversely rectangular and divided into three subequal teeth. There are 2 calli that are located along the lateral veins, the calli are situated at the base of the side lobes and are shaped pyramidal. The column is straight and measures 0.6-0.7mm long. The column is somewhat hooded at its apex. Stelidia and column foot are absent.

Herbarium Specimens

 

Holotype

 

C

 

Scent

 

I could find no record

 

Flowering Season

 

I could find no record

 

Culture

 

I know that this species is in cultivation in the UK and Australia. I am unsure if it is found elsewhere, if it is it could be a mislabelled plant.

 

Similar Species

 

Dendrochilum turpe

Dendrochilum philippinense

 

Other Information

 

Henrik Pedersen wrote (2005) that there were no close relatives known at the time Dendrochilum croceum was described. This species looks similar to Dendrochilum turpe and differs by its smaller leaves, shorter peduncle, narrower acuminate lateral sepals, flowering from the distal section of the rachis, two calli and a shallowly three lobed labellum.

 

Henrik Pedersen placed this species in section Convoluta on account of its entire rostellum, no stelidia or apical hood, convolute leaves, synanthous inflorescence, sessile labellum, short column and sequence of flowering.

 

The epithet refers to the colour of the flowers.

 

This description was taken from a specimen in the cultivation of Richard Warren in the UK. The plant came from the Philippines with other species and it was not known where it came from. Since the description Jim Cootes has identified this species as growing on the island on Luzon.

 

Reference

 

PEDERSEN, Henrik. 2005 A new miniature Dendrochilum, the Orchid Review volume 113 No 1265.

 

World Checklist of Selected Plant Families. 18 August 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 18 August 2009.