EaUISETUM. 
4] 7 
throiifihmit, sheaths loose pale with acute wedgeshaped teeth 
tipped with brown and nicmbrauons at the ed^^es, branches 
simple.— -E. 5. 2021. S. 6. JV. 4;3, 47 & 49.— St. slightlv rough. 
Barren st. w hipshaped at the end. Spike blunt. Sheaths 
coloured like the st. or paler ; teeth brown with nearly transpa- 
rent edges, ribs furrowed on the back. Branches usually barren 
or (/3. poh/stachion) each ending in a spike, hollow, with shallow 
fnrrows,lmvest Joint of branch (often reduced to its sheath) /"«//(■//// 
short of the st.-sheaf'h. Occasionally (y. midum DC.) the angles 
and teeth are fewer and the st. nearly or quite simple and dwarf. 
—Spongy bogs. y. Sandy places. P. VI. \Tl. E. S. I. 
7. JS. hjemdle (L.) ; d. simple very rough with 14 — 20 slender 
fiuTow.s, sheaths close whitish but the top ami bottom black, teeth 
with slender black-brown very deciduous tips. — E. B. 915. S. 8. 
X. 17.— St. 1—2 ft. high, simple, biennial, its central hollow 
equalling. at least I of diameter. Spike apiciilate. Sheaths 
widest at their top, at first gi-een with a black crenate rim after 
the teeth have fallen, then entirely black, and ultimately pale 
in the middle and black above and below. — Damp banks and 
woods. P. VII. Vm. E. S. I 
8. P E. Moor'ei (Newm.) ; st. simple annual ven' rough with 
about 12 fm-rows, sheaths loose white with the base black, teeth 
black-based rather persistent. — Phytol. v. 19. 6'. 12. — St. 1 — 2 
ft. high, never branched, its centi-al hollow equalling about f of 
diameter. Spike apiculate. Sheaths loose, pearly white ; teeth 
long, usuallj' light brown, whitish above, more persistent and 
longer than those of E. hyvmalc. — Probably not distinct from 
E. trachyodon, from which the annual st. and loose sheaths alone 
seem to separate it. — Wicklow. P. WH. I. 
9. E. trachyodon (A. Br.); st. simple or veiy slightly branched 
very rough with 8 — 12 furrows, sheaths close tdtimately wholly 
black, teeth slender persistent. — E. Mackaii 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 wholly black. Teeth more persistent 
than in the two preceding, usually black. — Mountain g^lens. P. 
vn. vm. s. I. 
10. E. vnrieydtum (Schleich.) ; st. simple or slightl}' branched 
very rough with 4 — -10 furrows, sheaths slightly enlarged uptvards 
green below black above, teeth blimt each tipped with a deciduous 
bristle. — N. 31. — St. about a foot high, erect, usually simple 
except at the base or irregularly branched, its central hollow 
equalling i of diameter. Lower half of the sheaths green like 
the stem, upper part black ; teeth persistent ovate, black in the 
centre, with a white membranous margin. Spike apiculate. — 
T 5 
