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b'. Lip orbicular, quite entire, staminodes small or inconspicuous-. 



Z. graniineum. 



b. Lip ovate or oblong, not bifid at the top. 

 a'. Staminodes entirely connected with the lip at their inner edge, 

 a^. Lip quite simple, seemingly entire, pale yellow, broadly ovate: 



Z. kptostachyum. 



b-. Lip much narrower than the broad faux to which the staminodes 

 are laterally adnate, with blunt short free tops, 

 a^. Lip pale yellow, ovate-oblong, blunt, flowers very long: 



Z. acuminatum. 



b-'. Lip and staminodes mottled-violet, broadly ovate, staminodes 

 with very short blunt or acute tops: Z inflexum. 



c\ Lip broader than long, bluntly bidentate at the top, yellow 

 and red, staminodes rounded yellow: Z. Lörzingii. 



b'. Staminodes free in their upper half, forming a threelobed lip. 

 a^ Lip violet, staminodes pale yellow. Flowers large: Z. odoriferum. 

 b". Lip and staminodes dark violet, yellow mottled, 

 a^. Flowers very small, lip oblong, staminodes extant: Z. neglectum. 

 b-'. Flowers very large, lip ovate, staminodes erect : Z. 



Key for determination of herbarium. 



A. Ligula 50—70 mm. long: Z. macroglossum Val. 



B. Ligula shorter than 35 mm. 



A'. Leaves linear tapering to the top, sessile, ten times or more longer 

 than wide, ligula very short. 



a. Spikes stems etc. densely hirsute pubescent, spikes subsquarrose 

 by the free tips of the bracts. Spike often terminal: 



Z. gramineum. 



b. Spikes etc. not hirsute pubescent. 



a'. Robust herb, leaves patent, spikes large oblong conical acute, 

 bracts rather hard, very acute, Ligula 2 mm. long or shorter. 



Z. Cassumunar. 



b'. Leaves grasslike, spike small elliptical or fusiform smooth; 

 bracts obtuse ligula 6 mm. long, refuse: Z. officinale. 



B'. Leaves not linear tapering, to the top, or not more than 8 times 

 longer than wide. 



a. Spikes cylindric or fusiform or ovate-fusiform, many times longer 

 than wide. 



a'. Spikes ovate-fusiform acuminate, subglabrous bracts a little in- 

 flexed, peduncles short procumbent, ascendent: Z. acuminatum. 



b'. Spikes cylindric, peduncles very long, bracts not inflexed. 

 a-. Spikes a finger thick, bracts acute. Herb glabrous. Leaves 

 200X65 or shorter, caudate acuminate: Z. kptostachyum. 



