344 AracecB. [Pistia. 



or pendulous, orthotropous, amphitropous, or half anatropous; 

 fr. a I- or few-seeded berry ; embryo small in copious endo- 

 sperm, or macropodous without endosperm. 



Fl. unisexual. 



Anth. -cells broader than the connective. 

 Ovules orthotropous. Herbs leafing and 

 flg, simultaneously {Arinecc). 

 Ovary solitary. A stemless floating herb i. PiSTlA. 

 Ovaries many whorled. 

 Ovaries in one whorl at the base of the 



spadix 2. Cryptocoryne. 



Ovaries in several whorls or spirally 

 arranged. 

 Aquatic or marsh herbs . . .3. Lagenandra. 

 Terrestrial herbs. 



L. compound 4. AriS/EMA. 



L. simple or lobed. 

 Ovules 1-2, basal 

 Ovules many, basal and apical . 

 Ovules anatropous. Herbs flg. before leafing; 

 1. compound. {Pythoniece.) 



Spadix without neuter fl 



Spadix with neuter fl. below the males 

 Anth. cells much narrower than the fleshy, 

 prismatic, truncate connective. [Colo- 

 casiea.) 

 Limb of spathe refracted .... 

 Limb of spathe erect. 



Ovules many, parietal .... 



Ovules few, basal 



Fl. bisexual. 



Perianth o, climbing shrubs. {Callece.) . 

 Perianth of 4-6 scales. {Oronttea:.) 

 Climbing shrubs with distichous 1. 

 Erect herbs. 



Prickly herbs, with long twisted spathe . 

 Smooth herbs, with ensiform 1. 



I. PISTIA/ L. 



A floating, stemless, gregarious, monoecious herb with 

 tufted root-fibres ; 1. sessile in a close spiral, obovate-cuncate, 

 together forming a cup, veins parallel, stipulary sheaths small, 

 membranous ; spathe small, shortly peduncled, tube short, 

 limb ovate, concave, spreading; spadix adnate to the back of 

 the tube of the spathe, free above; male infl. : — a whorl of 2-8 

 connate anth. near the top of the spadix, with a whorl of 

 minute neuters below it, anth. -slits vertical; fem. infl.: — a 

 solitary, oblong, i -celled ov., obliquely adnate to the spadix 



* Name from itkitoq, a drinker. 



