SHADY EQUISETUM. 
03 
SHADY EQUISETUM {natural size). 
Equisetum umbrosum, Willdenow. 
Equisetum Drummondii, Hooker. 
For this addition to the [British] species of Equisetum we 
are indebted to Mr. Thomas Drummond, who found it on the 
banks of the Isla and Esk, in Forfarshire, extending up the val- 
