516 99. EQUISETACE^E. 



3 4 -toothed sheaths, their lowest joint (including its terminal 

 sheaths) exceeding the st .-sheath ; general outline narrowed up- 

 wards, usually naked at the end. Fertile st. short, with few 

 (4 5) sheaths, appearing before the sterile ones. Sterile and 

 fertile st. distinct. /3. alpestre (Wahl.) ; sterile st. short (2 3 

 in.) prostrate with ascending terminal point and secund sub- 

 erect branches. Damp meadows [cultivated land, &c.] j3. Mickle 

 Fell, Teesdale. P. IV. E. S. I. 



2. E. praten'se (Ehrh.) ; sterile st. with about 20 striae very 

 rough with prominent points particularly above, branches simple 

 with 3 or 4 simple angles, teeth of sheaths \-ribbed but not to the 

 tip, fertile st. simple with many crowded deeply toothed sheaths. 

 E. umbrosum, H. F. 59. S. 2. N. 63. E. Dnimmondii E. . S. 

 2777. Sterile st. 11^ ft. high, nearly naked below ; with 

 many whorls of slender solid branches in the upper part, having 

 3- or 4-toothed sheaths, their lowest joint and sheath falling 

 short of the st.-sheath ; general outline remarkably blunt. Branched 

 fertile st. with larger sheaths and whorls of about 6 branches ; 

 simple fertile st. short (4 6 in.), with many loose and still 

 larger yellowish-white sheaths with black prominent ribs up- 

 wards and 1220 teeth. Wet places, rare. P. IV. E. S. I. 



3. E. maximum (Lam.) ; sterile st. nearly smooth with about 

 30 striae and branches, branches rough doubly angular simple, 

 teeth of sheaths %-ribbed, fertile st. simple with many crowded 

 large deeply-toothed sheaths. E. Telmateja, H, F. 58. S. 3. 

 N. 67. E. fluwatile Sm. not Linn., E. B. 2022. Sterile st. 

 36 ft. high; occasionally bearing a small terminal spike ; 

 furnished from top to bottom with whorls of slender solid 

 branches with 4 longitudinally furrowed angles and 4-toothed 

 sheaths, their lowest joint and sheath exceeding the st.-sheath. 

 Fertile st. stout, 1 foot or more high, with many very long pale- 

 brown sheaths with 30 40 teeth ; spike large. [j. Braunii 

 (Milde), a form with deeply furrowed sterile st., was collected in Forfar 

 by Mr. W. Gardiner.] Wet places. P. IV. E. S. I, 



** Sterile and fertile st. subsimilar, contemporaneous, branched. 



4. E. sylvat'icum (L.) ; sterile and fertile st. with about 12 

 furrows and many whorls of slender compound spreading or 

 deflexed solid branches, sheath lax ending in 3 or 4 blunt lobes. 

 E. B. 1874. H. F. 61. .4. N. 59. St. 12 18 in. high. 

 Sheaths of the branches with 3 lorg acute teeth each l-ribbed to 

 its tip. Fertile st. occasionally simple. Spike blunt. General 

 outline of sterile st. usually pyramidal, of fertile abrupt. 



