THE MONOCOTYLEDONES 



2013 



Fig. 1949. — Lysichiton camtschatense. 

 Flowering plant. Culti\ated. 



VI. Colocasioideae 



Land or marsh plants possessing latex. Leaves net-veined, stems 

 mostly tuberous. Flowers unisexual, usually naked. Stamens in synandria. 

 Thirteen genera, including Remiisatia, Colocasia, Xanthosoma. 



VI L Aroideae 



Land or marsh plants possessing latex. Leaves net-veined. Stems 

 mostly tuberous. Flowers unisexual, usually naked. Stamens free or in 

 synandria. Twenty-seven genera, including Spathicarpa, Arum, Dracun- 

 ciilus, Heltcodiceros, Arisaema. 



VIII. Pistioideae 



Floating aquatic plants without latex. Flowers unisexual, female 

 flowers solitary, male flowers in whorls. There is only one genus, Pisti'a. 



In the Pothoideae we have a number of genera fovmd mostly in the 

 tropics. Pot/ios itself contains about sixty species, all shrubby climbers 

 found in Malaya, while the genus Atithurium has over 500 species of 

 American origin, many of which are cultivated in greenhouses (Fig, 1950). 

 There are two species of Acorus; A. gramineus which occurs in Japan and 

 A. calamus which is known wild in Britain under the name of Sweet Flag. 

 Its native home is western Asia, but it has been introduced into many 

 countries for the sake of its sweet odour. It was naturalized in Britain in 



