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APOSTASIACEX OF THE MALAY PENINSULA. 291 
I have seen a form with dull purplish flowers on the top of the 
Larut Hills. 2H. floribunda, Lindl., and E. densa, Ridl., have a 
habit, common to some other orchids, of absolutely synchronous 
flowering. All plants of the same species blossom exactly on 
the same day ; and it is curious that, nearly allied as these two 
species are, they have different days for flowering. 
Erta (§ Hymenerta) ceriroua, Ridl. in Journ. Linn. Soc. 
(Bot.) xxxi. (1896) p. 282. 
Hab. Perak: Scortechini (Drawing 140). 
There isasketch of this species among Scortechini’s drawings, 
without locality. Ihave never seen it in the peninsula, knowing 
it only from Borneo. 
E. (§ Hymenerta) Matnoayt, Hook. f., Fl. Brit. Ind., v. p. 798. 
Hab. Penang: Government Hill, Maingay. 
This has not, so far as I know, been met with since Maingay 
collected it. 
E. (§ Hymeneria) saccirera, Hook. f., Fl. Brit. Ind., v. p. 797. 
Hab. Perak: Gunong Batu Putih, Wray. 
Pahang: Tahan River? 
IT am doubtful about the Pahang plant, as it is only in fruit. 
E. (§ Hymenerta) TENUIFLORA, Redl., sp. nova. Rhizoma 
crassiusculum ; pseudo-bulbi 6-8 poll. longi, { poll. crassi, 
approximati, teretes, subflexuosi; vagine pauce, tenues. 
Folia 3, 3-4 poll. longa, ¢ poll. lata, lanceolata acuta, tenuia, 
striata, carinata, apice inwqualiter biloba. Racemi 3-4, 5 poll. 
longi, graciles, undique floriferi, infra folia e basibus inter- 
nodorum orti. Flores tenues, copiosi, flavi, glabri; pedicelli 
+ poll. longi, tenues; bractew 3% poll. longe, ovato-lanceolate, 
reflex. Sepala +} poll. longa, lanceolata acuta; mentum 
nullum. Petala sepalis breviora, subsimilia. Labellum petalis 
brevius, lanceolatum acutum, integrum, flavum a macula 
mediané purpurea maculatum. Columna brevis; stelidia 
rotundata, inversa, stigma transversum partim § celantia. 
Anthera oblonga, margine antico truncato. 
Hab. Singapore: Sungei Morai! Toas! 
Johore: Batu Pahat! 
Perak: Hermitage Hill, C. Curtis. 
Pahang: Pekan! 
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