EQTJISETTJM'. 517 



/?. E. capilkire (Hoffm.) ; sterile st. with many long- slender 

 branches of about equal length, branchleta very fine threadlike, 

 emerald green, 23 ft. high. Wet shady plaees. P. IV. V. 



E. S. I. 



*** Stems of one kind, with or without simple hollow whorled 

 branches. 



5. E. limosum (L.) ; stem nearly smooth with many slight 

 furrows, teeth of sheaths short rigid acute, branches simple 

 whorled or none. St. 2 4 ft. nigh. Sheaths rather short. 

 Spike blunt. a. E. limosum (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. II. F. 02. jS. E. 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. [E. litorale (Kiihl.), with barren and fertile st. similar, st. 

 more deeply grooved and rougher, and with a smaller central hollow thai* 

 sp. 5, spores abortive, elaters 0, found at Bisley, Surrey, by Mr. W. H. 

 Heeby, is usually considered a hybrid betr^ sp. 1 & 5. See J~. of B. xxv, 

 (1887) p. 65, t. 273.] In stagnant water. P. VI. VII. E. S. I. 



6. E. palus'tre (L.) ; st. with 4 8 deep furrows branched 

 throughout, sheaths loose pale with acute wedgeshaped teeth 

 tipped with brown and membranous _at the edges, branches 

 simple. J?. B. 2021. H. F. 63. S. ~6. N. 43, 47 & 49. St. 

 slightly rough. Barren si. 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 ((3. polystachium) each ending in a 

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

 reduced to its sheath } falling short of the st. -sheath. Occasion- 

 ally (y.nudum DO.) 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. hyemdle (L.) ; st. simple very rough with 14 20 slender 

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

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

 H. F. 64. S. 8. N. 17. St. 12 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 

 crenaie 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- 



