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4. E. PALusTRis. Marsh Horsetail. June — July. 
W et places, not unfreqnent. 
5. E. LiMOSUM. Smooth Naked Horsetail. June — July. 
Hoh moor brick-ponds, near York. At tbe bottom of Wensley- 
dale. 
6. E. HYEMALE. Rough Horsetail Shave-grass. July — August. 
In marshy places. By the side of the river Derwent, three miles 
from Castle Howard. From Wakefield to Pontefract. Goadland 
dale, near Whitby. Hackness, near Scarbro’. Near Halifax. 
7. E. VARIEGATTJM. Variegated Rough Horsetail. May. 
About Winch bridge, and near the Tees, frequent. 
MARSILIACEiE. 
16. PILULAUIA. 
1. P. GLOBULiFERA. Pillwort. June — September. 
On Stockton forest, near Copsie’s wood. Near Richmond. 
