EQTnSETTTM:. 439 



1. EatncsE'riTM Linn. Horse-tail. 



• Fertile stems mostly unbranched and succulent ; barren stems 

 with solid whorled branches, appearing later. 



1. E. arven'se (L.) ; sterile at. with 6 — 19 furrows slightly 

 rough, branches rough with 3 or 4 simple angles, teeth of sheaths 

 long acute \-ribbed at the tip, fertile St. simple with few lax dis- 

 tant sheaths.—^. B. 2020. 8. 1. H. F. 60. N. 77.— Sterile 

 St. many, procumbent or ascending; with many whorls of 

 roughish solid usually simple branches with deep furrows and 

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

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

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

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

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

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

 erect branches. — Damp meadows. /3. Mickle Fell, Teesdale. 

 P. IV. E. S. I. 



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

 rough with prominent paints particularly above, branches simple 

 with 3 or 4 simple angles, teeth of sheaths 1-ribbed but not to the 

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

 —F. umbrosum S. F. 59. S. 2. JV. 63. F. Drummondii F. B. S. 

 2777. — SterUe st. 1 — -Ig ft. high, nearly naked below ; with 

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

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

 short of the st. -sheath; general outlineremMrkahlyblunt. 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 12—20 teeth.— Wet places, rare. P. IV. E. S. I, 



3. F. max'imum (Lam.) ; sterile st. nearly smooth with about 

 30 strise and branches, branches rough doubly angular simple, 

 teeth of sheaths 2-ribbed, fertile st. simple with many crowded 

 large deeply toothed sheaths. — See Bull. Soc. Bot. de Fr. viii. 

 637. F. Telmateia H. F. 58. S. 3. N. 67. F. fluviatik Sm., 

 F. B. %&% — Sterile st. 3 — 6 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 yerv long pale-brown sheaths with 30 — 40 teeth ; spike 



-Wet places. P. IV. E.S.I. 



