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Leaves linear or narrowly ovate, at least 10 X taller than wide, 

 acute, with obtuse base. Ligula small biiobed. Labellum round, 

 bifid to the middle. Staniinodcs small, placed below the lip (in 

 the explained flower): Z. cassuniunar. 



b'. Inflorescence elongate cylindric or fusiform. Bracts with a broad 

 tomentose margo. Leaves elliptic or lanceolate. Ligula biiobed, 

 lobes widely ovate (in adult plants). Lip ovate, staminodes ovate 

 projecting laterally. 



a^ Inflorescence cylindrical one finger thick, acute. Peduncle 

 often 500 mm. long. Staminodes fused with the lip, tips projecting 

 only 2 mm. Lip concolorous pale yellow: Z. leptostachym. 



b^. Inflorescence cylindric or cylindric-fusiform, broad. Lip oblong- 

 ovate, black purple. Staminodes large ovate projecting, pale 

 yellow. Bracteoles shorter than calyx: 



a^. Two lowest bracts of the spike (one empty) very large 

 and conspicuously inflated. Staminodes rounded. Bracts rather 

 obiuse mucronate: Z. odoriferum gemiina. 



b-*. Two lowest bracts not very inflated, staminodes oblong 

 acute. Bracts acute: Z. odoriienim. var. borneensis. 



c^. Staminodes rounded. Bracts acute-acuminate, glabrous: 



Z. odoriferum. var. aquosa. 

 c". Inflorescence ovate-oblong subacute. Bracts rounded not acute 

 with a very broad redbrown margo. Leaves large lanceolate sessile, 

 ligula very large (2 or 3 inches). Lip pale yellow : Z. moc/'o^g'/ossuOT. 

 b. Inflorescence when young ovate or widely elliptic, rarely at last 

 elongate conical or conical-cylindric. acute: 



a'. Inflorescence at first obcuneate afterwards ovate, squarrose, pu- 

 bescent, tips of the bracts hairy, extant. Leaves linear. Inflores- 

 cences lateral and terminal. Ligula very short, lobes trigonous 

 pubescent. Lip orbicular, pale yellow, no or very small staminodes: 



Z. gr ami ne urn. 



b'. Inflorescence not pubescent. Bracts appressed without free tips, 

 more or less convex, rounded. Staminodes attenuate or rounded 

 at the base, or almost free from the lip. 



a^. Inflorescence small fusiform-elliptic; bracts of the scape often 

 mucronate, bracts appressed without a conspicuous margo, not 

 convex. Lip rounded, entire, atropurpureous. Staminodes elliptic 

 with a rounded or obtuse base, atropurpureous. Ligula small 

 emarginate, lobes with a wide membranaceous edge. Leaves 

 grasslike : Z. officinale. 



h'^. Inflorescence rounded ovate or elliptic, sometimes elongate 

 and acute when old. Bracts rounded or subtruncate, convex with 



