108 METROPOLITAN PARK FLORA. 
that the Blue Hills and Middlesex Fells Reservations have 
been more thoroughly worked over than the Stony Brook and 
Beaver Brook Reservations, although the latter can scarcely be 
any the less interesting to a botanist studying the Ferns and 
their Allies. 
The arrangement adopted here is that of the late Prof. D.C. 
Eaton, in the 6th edition of Gray’s Manual, and comments are 
made in connection with the different species for the purpose 
of calling attention to certain points that may lead to a more 
thorough investigation, and result in restoring under proper 
guidance many species once common, or fairly plentiful, but 
now nearly or wholly extirpated from various causes now 
happily within control and future prevention. 
EQUISETACE-E. HorseTaIL FAmIty. 
EQUISETUM, L. Horsetam. Scovurine Rusa. 
FE. arvense, L. Common Horsevatt. 
Common everywhere in sandy soil; the fertile stems appear- 
ing very early in spring and soon perishing, the sterile stems 
appearing later and lasting allsummer. Band M, common :— 
B B*, near the ponds. 
E. sylvaticum, L. 
A rather scarce plant growing in wet shady woodlands; the 
fertile stems fruiting early in spring, the fruit soon withering 
away, but the stems remaining all summer with the sterile. 
B*, occurs. 
E. limosum, L. 
A rare plant; stems all of one kind, in shallow water, fruit- 
ing in summer. M*, occasional; ditch, S. of Bear Hill; 
meadows, N. side of Spot Pond, etc.:—S*, meadow near 
Office. 
E. hyemale, L. Scourmne Rus#. 
Wet places, evergreen. M*, occurs: — 5B, meadow near 
the brook. 

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