E, hyemale L. I.e. 1062. Eaton^ in Gray, 1. c. 677. 
Undci-iv, in 111. Fl. I 138 ; Nat. Ferns 129: in 
Britt. I.e. 23. Cliff 1. e. 19. 
ScouKiNG llusir. 
Plants 1 m. more or less high ; stems 5 mm. or wider ; 
sheaths about i em. long, somewhat spreading, marked 
with one or two narrow girdles ; teeth aeuminate, brown- 
ish, deciduous; spike somewhat eonieal, mueronate. 
In wet places, alongcreeks and rivers. 
§§§ Ridges of the stem almost smooth, 
3. E. laevigatum A. Br. 
Eqttisetum laevlgatum A. Br. 1. e. 87. Eaton ^ in 
Gray, 1. e. 677. Undej^w, in 111. Fl. i : 38 ; Nat. 
Ferns 129; in Britt. 1 e. 23. Clute,^ 1. c. 30. 
Horsetail. 
Plants 5-10 dm. or higher; stems smooth; sheaths i 
cm. or longer, spreading; teeth about 3 mm. 1., acumi- 
nate, black at the base with a brown apex ; spike i cm. 
or longer, oblong or ovate. 
Reported in the Manuals 'Delaware R. in N.J, and E. Pen?i. 
to iV. Car. and La. ^ west to Br. Col. and the Mexican border." 
Britt. 1. c. Although it may occur in our region, so far aslknow 
it has never been collected here. 
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