450 99. EQTnSETA.CEai. 



furrows, teeth of sheaths short rigid 'acute, branches simple 

 whorled or none.— St. 2—4 ft. high. Sheaths rather short. 

 Spike blunt. — a. E.limositin (L.); st. smooth, barren st. nar- 

 rowing gradually upwards, branches short rigid slightly taper- 

 ing upright and equalling st. -joints from green sheaths often 

 wanting. H. F. 62. — (3. JE. fluviatile (L.) ; st. subglabrous. 

 barren st. with a lax whiplike end, branches long slender taper- 

 ing lax exceeding St. -joints from dark-brown sheaths rarely 

 wanting. — In stagnant water. P. VI. VII. E. S. I. 



6. E. palus'tre (L.) ; st. loith 4—8 deep furroios branched 

 throughout, sheaths loose pale with acute wedgeshaped teeth 

 tipped with brown and membranous at the edges, branches 

 simple.—^. B. 2021. H. F. 63. S. 6. N. 43, 47 & 49.— St. 

 slightly rough. Barren st. whipshaped at the end. Spike 

 blunt. Sheaths coloured like the st. or paler ; teeth brown 

 with nearly transparent edges, ribs furrowed on the back. 

 Branches usually barren or {^. polystachiuni) each ending in a 

 spike, hollow, with shallow furrows, lowest joint of branch (often 

 reduced to its shenth) fallinff short of tlie st.-sheath. Occasion- 

 ally (y. nudum DC.) the angles and teeth are fewer and the st. 

 nearly or quite simple and dwarf. — Spongy bogs. y. Sandy 

 places. P. VI. VII. E. S. I. 



7. E. hyemah (L.) ; d. simple very rough with 14 — 20 slender 

 furrows, sheaths close whitish but the top and bottom blach, teeth 

 with slender black-brown very deciduous tips. — E. B. 915. 

 H. F. 64. 8. 8. N. 17.— St. 1—2 ft. high, simple, biennial, 

 its central hollow equalling at least | of diameter. Spike api- 

 culate. Sheaths widest at their top, at first green with black 

 crenate rim after the teeth have fallen, then entirely black, and 

 ultimately pale in the middle and black above and below. — 

 /3. E. Moorei (Newm.) ; st. annual very rough with about 12 

 furrows, sheaths loose white with the base black, teeth black- 

 based rather persistent. Phytol. v. 19 (1853). S. 12. St. 

 1 — 2 ft. high, its central hollow equalling about f of diameter. 

 Sheaths loose, pearly white ; teeth long, usually light brown, 

 whitish above, more persistent and longer.-— Damp banks and 

 woods. j3. Wioklow. P. VII. VIII. E. S. I. 



8. E. trachy' odon (A. Br.) ; st. simple or very slightly branched 

 very rough with 8 — 12 furrows, sheaths close ultimately wholly 

 black, teeth slender persistent. — H. F. 65. E. Machaii N. 24. 

 S. 9. — St. 1 — 3 feet high, simple or with solitary distant 

 branches, biennial, its central hollow equalling -J of diameter. 

 Spike apiculate. Sheaths quite cylindrical, pale green with a 

 black band beneath the teeth but ultimately wnolly black. 



