— 122 — 



After what has been said (Valeton 1904) about the dimorphous inflo- 

 rescence of Z. gramineum, the first section cannot be maintained. 



Cryptanthium is represented in Java by Z. acuminatum, here the pe- 

 duncles are very short, or if elongate they are procumbent or subterraneous 

 and of a whitish colour. The nearest allied species however is Z. püöm//f/m 

 RiDL. which according to K. Schumann is a true Lampugium (next to Z. gracile) 

 thus the distinction between these sections is not a very sharp one. 



If the structure of spikes and flowers is considered, the genus maybe 

 subdivised in a more natural way: 



Group ! Lampuzia. Bracts appressed, more or less convex, rarely a 

 little inflexed in old spikes, provided with a more or less broad, more or 

 less villous membranous margo; staminodes free or little adnate: 



Subsection 1 Zerumbet: Flowers without purple mottling. Lip emarginate 

 or bifid: (Z. Zerumbet, amaricans, aromaticum, littorale, papuanum). 



Subsection 11 Euzingiber: Flowers yellow and purple. Lip entire: Z. 

 officinale. 



Group II. Inflexa: Bracts with a rounded or attenuate much inflexed 

 upper edge, rarely appressed, commonly very convex and patent or decur- 

 ved, forming open pouches. Lip emarginate or subentire, staminodes more 

 or less adnate, flowers yellow and purple or red: Z. Ottensii, spectabile, 

 macradenia, neglectum, inflexum, Kunstleri, Lörzingii. 



Group in Cassumunar: Bracts ovate or lanceolate, appressed or with 

 patent tips. Lip orbicular bifid or entire, staminodes much adnate, lip white 

 or pale yellow, spikes often terminal: Z. Cassumunar, Z. gramineum, here 

 also Z. elatum Roxb, and Z. capitatum Roxb. 



Group IV Fusiformia. Spike more or less fusiform. Bracts ovate, obtuse 

 or lanceolate. Lip more or less connate with the staminodes to a 3 

 lobed disc. 



Subsection 1 Calycina. Calyx as long as or surpassing the bracteoles. 

 Sidelobes of the lip large. Flowers purple and yellow. Z. odoriferum, 

 acuminatum, puberulum etc. 



Subsection 11 Leptostachya : Calyx shorter than bracteole. 



This arrangement is based on malayan species, 'but i suppose that the 

 asiatic continental species may be ranged into the same groups. 



Key to determination of species by means of the flo- 

 werstructure. 



A. Staminodes narrowed at the base, almost or quite free from the labellum. 

 a. Labellum (and staminodes) atropurpureous, obovate with a rounded 

 entire top. 



al. Staminodes elliptic with a narrowed base. Z. officinale. 



bl. Staminodes ovate blunt vj'üh a roundeû hase. Z. officinale, var. Sunti. 



