long. Stems 1-3 cm. long and about 2-8 mm. in diame- 
ter, cylindric to subfusiform, with several nodes, branched 
or simple, one- to several-leaved, the leaves borne termi- 
nally and from the uppermost nodes. Leaves 3-6 cm. 
long and 1.2 mm. broad, linear-filiform, coriaceous or 
subterete. Inflorescence terminal, short, one- to three- 
flowered; bracts oval to suborbicular, chartaceous, sub- 
aristate, shorter than the ovary. Flowers large for the 
section, pale slate blue with the lip deep red. Ovary 
strongly three-winged. Dorsal sepal 8-10 mm. long and 
3-4 mm. broad, lanceolate, acute or acuminate, five- 
nerved, slightly cucullate. Lateral sepals adnate to the 
column-foot and elongated at the base into a mentum; 
lamina free, 8-10 mm. long and 4-5 mm. broad, lanceo- 
late-triangular, acute or acuminate, somewhat oblique, 
base forming a mentum 16—20 mm. long which is saccate- 
cylindric and closed for about 8-9 mm. Petals about 7-9 
mm. long and 1.5—2 mm. broad, linear-oblanceolate, 
acute or acuminate, two- (three-) nerved. Lip (free por- 
tion) about 12 mm. long and 3.5—4 mm. broad, oblong- 
oblanceolate, acute, subtrilobulate toward the tip, seven- 
nerved, somewhat fleshy but ecallose. Column short, 
about 38 mm. long, but the column-foot much elongated 
and about 16-20 mm. or more long. 
British New Guinea: Amieng, on Yaneng River, a tributary of the 
Buso River, above mouth of 'Tosapik Creek, Morobe District, elevation 
5000-6000 ft., flowers pale slate blue, lip deep red, tube purplish 
pink, March 26, 1941, Clemens 12089b (Tyre in Herb. Ames). 
Dendrobium cyananthum belongs to the subgenus Eu- 
dendrobium, section Oxyglossum of Schlechter’s treat- 
ment of the ‘‘Deutsch-Neu-Guinea’’ species of the genus 
in Fedde Repert. 1 (1912) 440 et seq. It is most closely 
allied to D. eyanocentrum Schlitr., but is a larger plant 
with flowers twice or more as large, narrower petals, 
larger leaves and other distinguishing details. 
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