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b. Labelliini white and yellowish or orange coloured, never with purple 

 mottling, emarginate or bifid at the top. 



a'. Labelluin rounded-ovate, wider than long or orbicular emarginate, 

 faux broad; staminodes orbicular or broadly ovate, placed below 

 the lip or very little projecting in the explicated flower, 

 a^ Flowers large, pure white or cream, lip and filament often yello- 

 wish, spikes large blunt: Z. Zerumbet. 

 b^ Flowers small, yellow with an orange coloured lip and filament, 

 a^. Lip broadly ovate with a broad base. Staminodes almost 

 orbicular: Z. aromaticum. 

 b^. Lip orbicular, staminodes broadly elliptic or ovate. Spikes 

 very dark brown : Z. aromaticum var. obscura. 

 b'. Labellum oblong or obovate, staminodes oblong, laterally promi- 

 nent (erect in the living flower). Flowers pale yellow or white, la- 

 bellum yellowish, sometimes bifid. 



a^. Labellum obcordate or oblong, emarginate, unguiculate, staminodes 

 oblong erect, narrowed at the base. Spike ovate pointed. Flowers 

 small : Z. amaricans. 



b^ Labellum obovate oblong, staminodes obovate oblong. Spike at 

 first ovate with very large sterile bracts, afterwards fusiform acute. 

 Flowers pale yellow: Z. littorale. 



C-. Labellum obovate and unguiculate, bifid to the middle (in the 

 open flower). Staminodes large, elliptic subacute quite free and 

 clawed, erect. Flower large white, labellum pale yellow. Spike 

 small, bracts smooth with a very narrow margo: Z. papuanum. 

 d^. Labellum oblong, emarginate, staminodes elliptic, flowers very 

 small pale yellow. Spike ovoid, acute, afterwards cylindric and 

 reaching a length of 165 mm. Bracts in old spikes inflexed: 



Z. amaricans, var elongaia. 

 c'. Flowers large, very pale yellow, lip and staminodes very pale 

 pink mottled with pale yellow. Lip oblong, emarginate, staminodes 

 very large (a little shorter than the dorsal petal) obovate, erect, 

 adnate at the base; anther dark yellow. Rhizome internally viola- 

 ceous or ink-coloured. Bracts much inflexed at the top: Z. Oitensii. 

 B. Staminodes more or less connate to the labellum, either forming a 

 three lobed labellum or almost inconspicuous. 



a. Lip orbicular and finely crisped, staminodes not conspicuous or 

 small, ovate and placed below ihe lip in the open laid flower, lip 

 white or pale yellow. 



a'. Lip very broad, somewhat bifid at the top, cleft to the middle 

 in old flowers, staminodes ovate acute placed below the lip: 



Z. Cassumunar. 



