Accepted name: Dendrochilum citrinum H.A.Pedersen, Nordic J. Bot. 15: 392 (1995 publ. 1996)


Subgenus – Platyclinis. Section – Platyclinis.


 
 
 

 

Synonyms

 

None

 

Origin in the Wild

 

Sulawesi

 

Elevation in the Wild

 

1,700-2,200 metres

 

Habitat in the Wild

 

This species has been collected on Mount Nokilalaki

 

The Plants Description

 

The roots are unbranched and grow from the rhizome that is short. The pseudobulbs are clustered on the rhizome and are shaped fusiform-terete. The pseudobulbs measure 6-6.7cm long and 0.5-0.6cm in diameter. The pseudobulbs are covered by 5-6 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres when the pseudobulbs mature. The leaves are petiolate; the petiole measures 4.8-8.3cm long. The leaf blades measure 17.1-23.8cm long and 2.8-3.5cm wide. The leaf blades are shaped linear-lanceolate and have obtuse apices. The leaf blades are thin textured and have 7 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 18.5-20.5cm long. The rachis is nodding, possibly pendent and measures 20.7-21.2cm long. The flowers alternate distichously and are spaced 4-6mm apart. There are 3-5 non floriferous bracts at the base of the rachis. The flowers open from the proximal part of the rachis.

 

The Flowers

 

The flowers are a lemon yellow colour. The sepals and petals open widely. The dorsal sepal is shaped lanceolate and has an acuminate apex, widest towards its base. The dorsal sepal measures 7.4-8mm long and 2.1-2.4mm wide. The dorsal sepal is 3-veined and has entire margins. The lateral sepals are shaped broadly lanceolate and have acuminate apices, widest towards their base. The lateral sepals measure 7.6-8.3mm long and 2.2-2.8mm wide. The lateral sepals are 3-veined and have entire margins. The petals are shaped broadly lanceolate and have subacuminate apices, widest at their base. The petals measure 5.9-6.6mm long and 1.9-2.2mm wide. The petals are 3 veined and have entire margins. The labellum is pendent, 3-lobed, glabrous, and 3-veined, the disc is flat. The labellum measures 5.4-5.8mm long and 2-2.3mm wide. The side lobes are smaller than the mid-lobe and are shaped obliquely-oblong with rounded to nearly acute apices. The mid-lobe is shaped lanceolate and has an acuminate apex. The labellum has two keels running from the base to the middle of the labellum. The column is slightly incurved and measures 3.6-4mm long. The apical hood exceeds the anther cap and has a rounded erose-dentate apex. The stelidia grow from the middle of the column, are suberect and shaped linear-oblong.

 

Herbarium Specimens

 

Holotype

 

National Herbarium Netherlands, Leiden (L)

 

Specimen L0043454

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected in the wild during April.

 

Culture

 

I do not think this species is in cultivation outside of a herbarium

 

Similar species

 

Dendrochilum beccarii

 

Additional Comments

 

Henrik Pedersen wrote that Dendrochilum citrinum resembles Dendrochilum beccarii from Sumatra but differs by its smaller habit and longer leaves, larger bracts and longer unequally emarginate stelidia.

 

Reference

 

PEDERSEN, Henrik. 1995, Thirteen new species of Dendrochilum (Orchidaceae), a new record from Burma, and a checklist of the genus in East Malesia. Nord. J. Bot 15:381-402. Copenhagen, Denmark.

 

World Checklist of Selected Plant Families. 12 September 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 12 September 2008.