LYSICHITON CAMTSCHATCENSE (l.) SCHOTT 
191 
gaining a foothold on the streambed, but as the energy of the current 
is slackened by the accumulation of debris and temporary floodings 
occur in the wet seasons, a characteristic brookside flora soon appears. 
Lysichiton camtschatcense plays a prominent part in such situations 
in this region. A representative area from a ravine of the above- 
mentioned nature was selected at Seattle, Washington, August, 1914, 
and the plants recorded. 
Herbs: Agrostis depressa, Athyrium cyclosorum, Cardamine pennsyl- 
vanica, Cardamine oligosperma, Cinna latifolia, Circaea pacifica, Clay- 
tonia sibirica, Epilobium halleanum, Epilobium adenocaulon, Equi- 
setum telmateia, Geum macro phyllum, Leptaxis menziesii, Lysichiton 
camtschatcense, Polystichum munitum, Ranunculus bongardi, Ranun- 
culus bongardi greenei, Roripa curvisiliqua, R. nasturtium, Stachys 
ciliata, Tiarella trifoliata, Washingtonia brevipes. 
Shrubs: Echinopanax horridum, Ribes bracteosum, R. divaricatum, 
Sambucus callicarpa. 
Trees: Acer macrophyllum, Alniis oregona. 
The steep slopes of the ravine were covered with the follow^ing 
conifers: Pseudotsuga taxifolia, Thuja plicata, Tsiiga heterophylla 
and Taxus brevifolia. 
The later stages in the history of the river, e. g., the establishing 
of the flood plain make possible a development of Lysichiton unat- 
tained in any of the previous stages. As the river grows old and the 
flow of the water sluggish the deposition of sand and silt becomes 
more effective. In the extensive mud flats formed in this way along 
or at the mouth of slow flowing streams, we often find Lysichiton 
more gigantic in size than anywhere else. The following data have 
reference to an alluvion of such nature located on the Little Spokane 
River at Waikiki (May, 191 3). The ligneous vegetation was made 
up of Alnus tenuifolia, Ribes aureum) R. irriguum, Salix lasiandra 
caudata, Salix sitchensis, Sambucus glauca, Spiraea menziesii. The 
herbaceous vegetation was almost exclusively composed of Lysichiton 
camtschatcense. The mud lay bare between the thickets, and scattered 
here and there were Limnorchis stricta and Cardamine pennsylvanica. 
Typical estival plants were absent, the shade being too dense. 
Likewise where wet meadows instead of forest cover the flood 
plains as is often the case in the Puget Sound region the conditions 
are very favorable for a luxuriant growth of Lysichiton. The exten- 
sive meadows around Bothell mainly composed of Agrostis depressa, 
