216 



[CLASS 



CLASS II. MONOCOTYLEDONS. 

 SUB-CLASS, Spadiciflorae. 



6 1. Natural Order Aroideae. The Arum Family. 



DISTRIBUTION. A large Family, most numerous in 

 tropical and sub-tropical countries. British genera 2, 

 species 2. 



Herbs. Flowers upon a spadix. 



FIG; 160. Barren pistillate flower 

 of same. 



FIG. 159. Spadvx 01 Arum. st. 

 stamens ; b. st. rudimentary sta- 

 mens ; p. pistils ; b. p. barren 

 pistils. 



Fi3. 161. Single stamen of same, 

 constituting a naked, monandrous 

 flower. 



Type Common Arum (Arum maculatuni). 



Herb, with tuberous stock (corm) .radical sagittate 

 leaves, and numerous unisexual achlamydeous flowers 

 upon a succulent spike (spadix), sheathed by a large 

 membranous bract (spathe). 



