— 126 — 



a*. Bracts few, smooth, ligula 15 mm., or shorter. 



Z. papuanum. 



b'. Bracts numerous, gibbous, ligula 20 mm; leaves more 

 attenuate. Z. littorale. 



GeneralKey. 



I. Bracts very convex, with much incurved margo, appressed to each other 

 with the side edges, forming open pouches. In dried specimens-the bracts 

 are extant, rather coriaceous and ribbed, the spike is squarrose. 



A. Bracts with extant tips, more or less recurved, forming ovate pouches. 



a. Infi. 100 mm. tall or less; bracts rounded not very much recurved. 

 Flowers atropurpureous and yellow. Labelium ovate with short acute 

 sidelobes: Z. inflexum. 



b. Infi. 140 mm. tall, bracts lanceolate very much recurved, acute. 

 Flowers yellow and red. Labelium very broad, rounded with short 

 rounded sidelobes: Z. Lörzingii. 



B. Bracts erect with rounded or subtruncate very much inflexed upper- 

 margo, forming semilunar or semicircular pouches. 



a. Inflorescence very large, subglobose or broadly elliptic (often 180. 

 mm. X 150 mm.). Flowers 85 mm. long: Z. macradeniiim. 



b. Inflorescence elliptic or at last cylindric, 160X50 or shorter. 

 Flowers 50 mm. or less: Z. neglectum 



II. Bracts appressed with their margo over the entire outline, flat or convex, 

 not forming open pouches. 



A. Peduncle rather fleshy, often short, (25—150) procumbent, ascending, 

 never quite erect, more or less subterraneous. Spike elliptical or ovate 

 (70—200 mm. long), pink. Flowers large quite yellow, staminodes 

 adnate with a broad base. Bracts shorter than calyx, Ligula bilobed, 

 with short ovate lobes: Z. acuminatum. 



a. Inflorescence many times taller than wide. Spike acuminate bracts 

 rounded. Herb and bracts smooth: Z. acuminatum, genuina. 



b. Inflorescence large elliptical or cylindrical, (260X40) bracts obtuse 

 (dried subacute) and mucronate; sericeous with a tomentose margo : 



Z. acuminatum, vai . acutibractea. 



c. Inflorescence short (70X40) ovate or elliptic, blunt. Herb densely 

 tomentose. Bracts hairy: Z. acuminatum, var. borneensis. 



B. Scape and peduncle erect, short or elongate, rarely arcuate or pro- 

 cumbent, not subterraneous. 



a. Inflorescence fusiform or cylindric, many times longer than wide. 

 Bracts (dry) elongate-obcuneate acute. 



a', inflorescence fusiform or ovate-fusiform very acute. Bracts coria- 

 ceous with a narrow membranous margo, acute, puberous. 



