462 A roide@w— Calla. 
succeed as a water plant in the South-west if planted at a 
sufficient depth. The fine foliage, pure white spathe, and 
SSiese 
Fig. 223, Richardia Athiopica, (About } nat. size.) 
yellow spadix are too well known to need further description. 
This plant is a native of the Cape of Good Hope. 
2. ARUM. 
Erect or dwarf perennials with thick rhizomes and pedate or 
hastateleaves. Flowers devoid of perianth, unisexnal, clustered on 
the lower part of the spadix ; female flowers below, and separated 
from the males by barren or rudimentary ones. Spathe large, 
convolute ; spadix naked and club-shaped at the top. About 
forty species are known, from the temperate and warm regions 
of the North. The derivation of the generic name is doubtful. 
Besides the British species alluded to above, there are two or 
three other hardy species occasionally seen in gardens. Of 
