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Key to tlie determination of Species. 



A. Spike radical or axillary, elongate, slender, with distant cyrabiform 

 bracts involucrating one or more flowers. Anttiercells dehiscing by splits. 



a. Spike radical much longer than petiole (+ 130 mm.) Bracts enclo- 

 sing 3 or more flowers. Leaves lanceolate long petioled. Anthercrest 

 conspicuous : G. laxiflorum. 



b. Spike very short axillary. Bracts few, enclosing one flower; 

 connective very little prolonged, blunt. Labellum saccate. 



a'. Leaves subsessile, very long linear lanceolated, spikes sometimes 

 extraaxillary. G. angustifolium. 



b'. Leaves ovate-lanceolate, slender petioled, spikes in all the axils. 



G. gracile. 



c. Spike very short axillary, branched. Bracts 4 enclosing numerous 

 flowers. Leaves petioled with long sheaths, lanceolate. Crest 

 conspicuous, (non vidi.) G- bractescens.? 



B. Spike terminal, flowers and bracts unilateral, secund, biseriate. Anther- 

 cells opening by splits or pores. 



a. Spike elongate on the top of a green foliate stem, Bracts green. 

 Anthercells opening by longitudinal splits, no crest. Labellum saccate 

 (Eugastrochilus). G. pulcherrimum. 



b. Spike more or less abbreviate, very dense flowered, ovate-fusiform, 

 enclosed by one or two large sheaths, axis short broad, bracts 

 white or very pale green; cells opening by splits or pores. 



a'. Spike from the center of a tuft of leaves. 

 d}. Leaves radical or approximated on a very short stem, inflorescence 

 long peduncled, peduncle nude with one or two leaves at the top, 

 flowers rather large, lip panduriform or oblong, subsaccate, 

 crest, of the anther short. Leaves long petioled, elliptic-oblong, 

 a^. Anthers dehiscing longitudinally,, crest recurved or reflexed; 

 staminodes obovate much shorter than labellum, flowers 

 reddish pink. ' G. panduratum. 



■ b^. Anthers dehiscing by pores. Crest very short, bidentate, a little 

 curved. Staminodes oblong, flowers white, tinged yellow and red. 

 a"*. Flowers rather large, labellum oblong cuneate much longer 

 than the petals a little deflexed. Herb 2-5-foliate: 



G. javanum. 



h^. Flowers much shorter, labellum rhomboid obcuneate. Herb 

 1 -foliate, 2-foliate in variety B. • G. Lörzingii. 



c^. Anther cells opening longitudinally, no crest. G. pulchella. 

 b-. Leaves alternate and distanced but with imbricating sheaths 

 on an erect stem. Inflorescence sessile on the top, sheathed 

 by the uppermost smaller Jeaf. ■ ■ 



