Key to the Species 
1. Lateral lobes of lip linear 
la. Lateral lobes of lip broad 
2.  Midlobe of lip sessile with a bead — 
2a. Midlobe of lip with a narrow, cuneate base ae eS 
3. Lip with entire margin except at tip. . . . . P. tricuspidata 
3a. Lip with a coarsely dentate margin throughout . P. pedunculata 
4, Stem pendulous; lateral lobes of lip subulate, 
p> CO DD tO 
deeply biparted .......... 2... . P. uniflora 
4a. Stem erect to suberect; lateral lobes of lip at 
most erose-denticulate .. . Sea ¢ a= 2 
5. Midlobe of lip deeply cleft, cutee fawees ies . PP, Biswasiana 
5a. Midlobe of lip biparted, erose- anecalate: 
flowers white... . 2 ew. eB. Vandarum 
6. Inflorescence longer than seen nididie of lip 
broadly $-lobed . . ..... ; . . . PP. Hookerana 
6a. Inflorescence as long as or shorter — Hiv: 
midlobe of lip entire or more or less 8-lobed . 
7. Flowers large, showy ; midlobe of lip cuneate- 
unguiculate, divergingly bilobed . . .... . . .P. teres 
Ta. Flowers small, not showy; midlobe of lip sessile, entire. . 8 
8. Petals widerthan sepals. ........ .. .. P. subulata 
8a. Petals narrowerthansepals. . .. . fo we a 
9. Lateral lobes of lip subquadrate- Swarieatas mite 
retuse .. . . . . . PP. Sillemiana 
9a. Lateral lobes a etiebe of tis obhuse oN. god a a ee 
10. Inflorescence 2- to 4-flowered, as long as leaves: 
petals obliquely subspathulate . . . . . . . . P. flavescens 
10a. Inflorescence 1-flowered, much shorter than leaves; 
petals sessile . . ........ 2... . . . Py Greenti 
List of Species 
Papilionanthe Biswasiana (Ghose & Mukerjee) Garay, comb. nov. 
Basionym: Aerides Biswasiana Ghose & Mukerjee in Orch. Rev. 538: 
124, 1945. 
Papilionanthe flavescens (Schltr.) Garay, comb. nov. 
Basionym: Aerides flavescens Schltr. in Fedde Rep. 19: 382, 1924. 
Papilionanthe Greenii (W.W.Sm.) Garay, comb. nov. 
Basionym: Aerides Greenit W.W.Sm. in Rec. Bot. Soc. Ind. 4: 271, 
1911. 
Papilionanthe Hookerana (Rchb.f.) Schltr. in Orchis 9: 80, 1915. 
Basionym: Vanda Hookerana Rchb.f. in Bonpl. 4: 324, 1856. 
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