Accepted name: Dendrochilum longicaule J.J.Sm., Bull. Jard. Bot. Buitenzorg, III, 5: 34 (1922)

Subgenus – Platyclinis. Section – Eurybrachium.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sumatra

 

Elevation in the Wild

 

2,200-2,400 metres

 

Habitat in the Wild

 

This species has been collected from the summit area of Mount Kerinci

 

The Plants Description

 

The rhizomes are long, thin and pendent, the rhizomes branch and can grow to lengths of 1.15 metres long. The pseudobulbs are spaced 12.5cm apart. The pseudobulbs are terete and about as thick as the rhizome when dry and measure 3cm long. The leaves are petiolate the petiole measures 2cm long. The leaf blade is shaped narrowly lanceolate and has acute apices, narrowed at the top third. The leaf blades measure 13cm long and 1.2cm wide.

 

The Inflorescence

 

The inflorescence is synanthous. All the flowers are open before the leaves have developed. The peduncle measures 2.5-5cm long. The rachis is flattened, sparsely hairy and measures 5-8.5cm long. The flowers are spaced 3mm apart.

 

The Flowers

 

Jim Comber wrote that approximately 26 flowers grow on an inflorescence (Comber 2001). The flowers measure 7mm across, are bright green with a darker green patch in the centre of the labellum. The sepals are shaped elliptic-oblong and have acute apices. The sepals measures 5mm long and 1.8mm wide. The petals are narrower at their bases. The petals measure 4.4mm long and 2mm wide. The petal margins are erose. The labellum is parallel to the column and entire. The labellum measures 2.75mm long and 3.3mm wide. The apex of the labellum is broader and shaped ovate with an acuminate apex.  The basal margins are erect and erose. There are two short ridges that curve at the base and joined together transversely. The column measures 1.4mm long its apical hood is concave with bidentate or tridentate margin. The stelidia grow from half way up the column and are equal to or slightly exceed the column apex. The stelidia are shaped linear.

 

Herbarium Specimens

 

Isotype

 

National Herbarium Netherlands (L)

 

Specimen L0058430 (photo)

Specimen L0058431 (photo)

Specimen L0058432 (photo)

 

Isosyntype

 

AMES

 

Specimen 98779 (photo)

Specimen 98780 (photo)

Specimen 98781 (photo)

 

Scent

 

I could find no record

 

Flowering Season

 

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

 

Culture

 

I do not think this species is in cultivation.

 

Similar species

 

Dendrochilum acuminatum

Dendrochilum latilobum (see this page for differences)

 

Other Information

 

J.J Smith wrote that this species is similar in habit to Dendrochilum acuminatum but differs by its shorter inflorescences, fewer and larger flowers, the tepals are wider and the base of the labellum is shorter than the apex.

 

This species has the longest and thinnest rhizome of any Sumatran Dendrochilum in section Eurybrachium.

 

Reference

 

COMBER, J.B. Orchids of Sumatra, 2001, Royal Botanic Gardens Kew

 

World Checklist of Selected Plant Families. 02 October 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 02 October 2008.