LYSICHITON CAMTSCHATCENSE (l.) SCHOTT 
successions outlined above, particularly in the alnetum and in the 
shrub zone. In the former situation it reaches the same gigantic 
size as in the forested alluvial deposits. Figure 2 shows the spring 
aspect of an alnetum where some windfalls have occurred (Lake 
Washington, April, 1914). Lysichiton camtschatcense grows here 
in an Oenanthe sarmentosa association with Agrostis depressa, Angelica 
Fig. 2. Alnetum with Lysichiton and Oenanthe sarmentosa. Author's photcgraph. 
genuflexa, Epilobium adenocaulon and Myosotis laxa as secondary 
species. A slow-flowing brook empties its water on the northern 
side and here (not visible in the figure) has a quite different flora 
established itself. Roripa nasturtium, characteristic of such localities, 
forms an almost closed carpet in which Lysichiton camtschatcense, 
Agrostis depressa, Mimulus moschatus, Panicularia nervata and Ver- 
onica americana are interspersed. 
When the topographic conditions are such that complete loss of 
drainage ensues a series of successions originate which differ radically 
from those of the half-drained swamp. Bog successions take the 
