Materials for a Flora of the Malayan 

 Peninsula. 



PART III. 



XXI. AEACEAE. 



Hr""' > . t tuberoUvS or with a creeping rhizome or scandent 

 jhrubs. Leaver alternate petioled, petiole sheathing at base or for 

 3ts whole length, lamina herbaceous or coriaceous entire or lobed. 

 Plowers uni- or bisexual sessile spicatc, on a spadix more or less 

 enclosed in a green or coloured spathe. In unisexual plants, the 

 males are at the top of the spadix the females at the base, with 

 usually abortive flowers (neuters) between them. Perianth lobes 

 scale-like or absent. Anthers 2-4 celled dehiscing by pores or slits. 

 Ovary sessile 1-3 celled. Style usually short. Stigma discoid, or 

 lobed. Ovules 1 or more. Fruit baccate rarely capsular. Seeds 

 few or 1 rarely numerous usually imbedded in pulp. Albumen ab- 

 sent or plentiful. 



Species about 1000. Whole world but most in the tropics. 



(A.) 



Flowers monoecious (occasionally dioecious in Arisaema). 



Perianth absent. 



Tribe I. Arixeae. Spadix with an ap- 

 pendage (except Pistia aiid Cnjptocorijne). 

 Stamens free, ovary 1 celled, ovules ortho- 

 tropous. 



Floating stemless herbs . . . . . . 1. Pistia. 



Submerged or nuirsh plants. Spadix very 



short, spathe long tubular . . . . 2. Cryptocoryne. 



Terrestrial tuberous lier!)s often unisexual. 



Xeuter flowers few or none . . . . 3. Arisarnia. 



Bisexual. Xeulers numerous above llie fe- 

 males . . . . . . , . . . 4. Ttjphonium. 



CI 



