340 MR. H. N. RIDLEY ON TWO NEW GENERA 
On two New Genera of Orgbids from the East Indies. 
By H. N. Ripuey, M.A., F.L.S. 
[Read 2nd April, 1891.] 
(Pirates XLIII. & XLIV.) 
Or the two curious plants which I herewith describe, one, Leu- 
colena, was found growing in Malacca; the other I obtained 
through the courtesy of Drs. Treub and Burck from the her- 
barium at Buitenzorg, it having been collected many years ago 
in Amboyna by Teysmann. 
LEUCOLENA, n. gen. 
Herba fragilis, tenuis, saprophytica, rhizomate elongato fusi- 
formi-tuberoso, horizontali in humo profundo radicibus paucis 
gracilibus. Caulis erectus aphyllus gracilis, vaginis paucis 
dissitis. Racemus pauciflorus, flores parvi explanati. Bracteæ 
lanceolate, ovate, parve. Sepalum postieum lanceolatum obtu- 
sum, lateralia connata apicibus liberis, obliqua falcata obovata 
obtusa sub labello supposita. Petala quam sepalum posticum 
latiora ovata apice rotundata, sepalo postico adnata usque ad 
dimidium longitudinis. Labellum basi angusta lamina late ob- 
ovata triloba ; lobi laterales deflexi lati obtusi, medius dentifor- 
mis brevissimus. Columna libera erecta, stelidiis longissimis 
decurvis linearibus subacutis arcuatis. Anthera filamento lon- 
giuseulo, plana ovata truncata quadrata papillosa. Pollinia 2 
aurantiaca piriformia subgranulosa, latere uno canalieulato, 
disco quadrato truncato unico. Stigma haud profundum. Ros- 
tellum truncatum retusum. 
Species unica. 
LEUCOLENA ORNATA. (Plate XLIII.) 9 -12-uncialis, caule 
olivaceo, floribus parvis ad 7, sepalo postico et petalis olivaceis 
medio obscurioribus, sepalis lateralibus olivaceis striis duabus 
obscurioribus, basi roseis.  Labellum album, medio elevato 
violaceo, 4 unciam longa et lata. Columna alba. 
This remarkable little plant was found growing upon a path 
recently cut through the dense forest of Bukit Sadanen in 
Malacca. Owing to the clearing of the wood, a number of 
Saprophytes had appeared on the path; among them were Seia- 
phila tenella, Blume, Salomonia aphylla, Gymnosiphon borneense, 
Benn. and an undescribed species of Lecanorchis. Leucolena, 
which grew with these plants, seemed to be very local, and I 
