Stems of two kinds, - \, 
Branches simple, 
5. E. arvense L. PI. 8. 
Equisetiun ai'vense & Gron. 1. c. Fl. Virg. 123. 
E, arvcjiseXu, I.e. 1061. Eaton^^xw QfX-<rj ^ 1. c. 
676. Underw. in 111. Fl. i : 36 ; Nat. Ferns 1 27 ; 
in Britt. I.e. 22. Clute,^ 1. e. 43. 
IIOKSE'l AIL. 
Plants 3-6 dm. or hig-her ; sterile stems ^ mm. or wider 
at the base and sometimes 6 dm. or higher, bearing r.n- 
merous linear branches of 'Variable lengths ; sheaths abont 
I em. long including the dark-brown, acuminate teeth: 
fertile stems (appearing in early spring) about 2 dm. h., 
branchless ; spikes oblong, 3 cm. or shorter. 
A 1 o n g r a i 1 r o a d e m b a 11 k m e n t s , infields 
and 1 o \v ground. 
'%% Branches componnd. 
6. E. sylvaticum L. PI. 8. 
Eqnisetnm sylvaticiim 1, c. 1061. Eaton ^ in 
Gray, 1. e. 676. ^//c/^^rzt^. in 111 . Fl. i : 36 ; Nat. 
Ferns 127; in Britt. 1 c. 22. Glutea l, c. 55. 
1 1 oijsirr A I r.. 
62 
