22i 
XXIV. Ferns. Crypr. Filiccs^ 
721. Corn Horse-taiL — E. arvense. 
Fertile stalk naked^ barren one leafy. — 
Curtis, IV. 64. 
Cornfields, March, P. Common. 
Obs : 
Sheaths of the joints with from 4 ia 5 teeth. 
722. Marsh Horse-tail, — E. palustrc. 
Stem angular, fronds undivided. — Bolton. 
35 * 
Marshes, June, P. Rare. 
Atnpthill MooTy — Stevington Bogs. 
723. River Horse-taiL — E. fluviatilef 
Stem scored, fronds nearly simple. — Bolton. 
36* 
Marshy Places, May, P. Common. 
724. Smooth Horse-tail. — E. limosum. 
Stem somewhat naked, smooth. — Ray’s Sy- 
nopsis. V. 2. 
Rivers, May, P. Common. 
Obs : 
Sheaths of the joints more sharply and narrowly toothed 
than in the foregoing. 
*"25. Rough Horse-taiL — E. hyemale. 
Stem naked, rough to the touch, somewhat 
branched at the base. — BoltoQ. 39. 
Bogs, 
