- 84 - 



lelis nunc sutura antica, nunc poris terminalibus dehiscenübus, margini 

 coiinectivi adnatis, cotinectivo angusto vel laliore canaliculato apice mutico 

 vcl appendice brevi vulgu recurvo vol reflexo, niinquam aiitheram 

 SLiperante luiioitudiiie, tcrniiiiato. Pollen nun cohaereiis, exine laevi, vel 

 aculeato (G. angusti/oliuni). Ovariiun 3-ioculare; pauci-vol multi-ovulatum. 

 Ovula erecta. Capsula oblonga 3-loculare, valvis interdum (Gastrochilus 

 javanum) carnosulis, dehiscentia revolutis. Semina arillo basilari laciniato 

 instructa. 



Rhizoma variuin nunc tuberculatum nunc longe repens, tenue et 

 stoloniferum ; radices saepe tuberosi clavati vel capitati interdum omnes 

 filiformes. Gaulis rare elongatus, saepe brevis et vaginis foliorum 

 inclusus. 



Inflorescentia spicata centrifuga: nunc terminalis, secundiflora, rachi 

 unilaterali, dorso nuda subcrassa elongata vel abbreviata, bracteis densis 

 numerosis bifariis, singula florem bracteola involutum comitante, sessilis 

 vel pedunculata; nunc lateralis, radicalis, nuda, vel axillaris et vagina 

 folii subinclusa, rachi gracili brevi vel elongata, bracteis distantibus 

 cymbiformibus vulgo paucis, flores singulos vel paucos bracteolis involutes 

 includentibus: nunc, in singula specie, strobiliformis bracteis latissimis 

 rotundatis imbricantibus. 



There are now 45 or more species known of this genus and these may 

 be ranged more or less naturally into groups by attending either to the 

 structure of the flower, especially of the anther, or to that of the inflores- 

 cence; but it must be considered that the modifications in either of these 

 characteristics do not run parallel. If the structure of the stamen is taken 

 as a base there are principally three types to be distinguished. 



1. Anthers straight, neither incurved nor recurved, cells parallel opening 

 by splits, connective not or very little prolonged above the cells. Often but 

 not always the labellum is more or less profoundly concave (saccate). '1 o 

 this group the two type species of the genus belong, G. pulcherrinuim 

 Wall and G. longlfollum Wall, further G. pulchellum Ridl., G. albosanguinea, 

 G. pulcherrimum, G. tubroluteum, G. ochroleucum (all of Ridley), G. xiphos- 

 tachyuni, G. phyllostachyum, G. Thorellii (of Qagnepain), and probably 

 many more: G. Prainianum Ridl., G. anomalum K. Sch, G. plicata Ridl. 

 With a few exceptions these species have a saccate labellum, and the in- 

 florescence is elongate, multiflorous and on the top of a leafbearing stem. 

 This group might be called: Eugastrochilus. 



2a. Anthers linear, a little recurved, cells parallel in the lower part, 

 diverging near the top opening longitudinally. Connective projecting above 

 the cells forming a short linear 3-dentate at last reflexed crest. Labellum 

 oblong with a subsaccate lower portion and a deflexed upper half. Inflo- 

 rescence central. 



