APOSTASIACEZ OF THE MALAY PENINSULA. 343 
POLYSTACHYA SINGAPURENSIS, Ridl., sp. nova. Radices crasse. 
Pseudo-bulbi { poll. longi, vetusti globosi, arcte approximati. 
Folia 2-4, usque ad 4 poll. longa 1 poll. lata, insequalia lorata, 
apice ineequaliter biloba, lete virentia. Racemus 2 poll. longus, 
anceps, a vaginis papyraceis dissitis fere usque ad flores tectus ; 
rhachis pubescens. lores pauci, parvi, flavo-virentes. Bractew 
cum 3 parte pedicelli equilonge, ovate acuminate, virides. 
Sepala bullata, posticum lanceolatum, lateralia triangularia. 
Petala sepalis paullo breviora, anguste spathulata. Labelli 
lobi laterales longiusculi lineares falcati acuti, medius ovalis 
margine involutus apice subacutus decurvus, preter basin 
roseam flavescens, intus pulverulentus. Columna brevis, apice 
rosea; pes longus. Anthera galeata, obtusa, ferme bilocu- 
laris; margo anticus profunde emarginatus, quasi bilobus ; 
pollinia 4, semiglobosa, pulverulenta; rostellum nullum. 
Stigma magnum. 
Hab. Singapore : Sungei Morai, on old low trees on the edge 
of a mangrove swamp, rare ! 
This plant I find to be cleistogamous. The rostellum being 
absent, the pollinia slip easily into the stigmatic cavity. The 
lip is longer than broad, and the mid-lobe is considerably longer 
than the narrow falcate lateral lobes. The plant is allied to 
P. purpurea, Wight; but that is said to have purple flowers, 
and only a short median ridge furfuraceous on the lip; 
whereas, in P. singapurensis, the whole of the lip is mealy 
within. 
P. stamensis, Ridl., sp. nova. Pseudo-builbi 4 poll. longi, 
conici, vetusti approximati. Caulis supra pseudo-bulbum 
3 poll. longa. Folia usque ad 5 poll. longa, $ poll. lata, 
lineari-lanceolata, disticha, inequalia, apice inequaliter biloba. 
Racemus vix 4 poll. longus ; pedunculus anceps, a vaginis arcte 
appressis tectus. Flores c. 15, parvi, virides. Bractew minime, 
basi ovate, apice subulate. Pedicellus cum ovario ¢ poll. 
longus. Sepala prasina, posticum ovato-lanceolatum, lateralia 
postico multo majora triangularia acuta. Petala sepalis multo 
minora, cuneata, acuta, alba. Labellum obovatum, undique 
farinosum, album; lobi laterales parvi angusti falcati obtusi, 
medius rotundatus apice breviter bifidus, margine sinuatus. 
Columna brevis; pes longiusculus, canaliculatus ; clinandrium 
vix depressum. Anthera lata, ovata, obtusa, margine antico 
