EQUISETUM. 405 
6. E. palustre (L.); st. with 6—8 deep furrows branched 
aide kr sheaths loose pale with acute wedgeshaped teeth 
tipped with brown and membranous at the edges —E. B. 2021. 
N. 43, 47 and 49.—St. slightly rough. Catkin blunt. Sheaths 
of the colour of the st. or paler; teeth brown with nearly trans- 
parent margins, rib furrowed on the back. Branches usually 
barren, or (8. polystachion) each terminating in a catkin. Occa~ 
sionally (y. nudum DC.) the angles and teeth are fewer and the 
st. nearly or quite simple and dwarf—Spongy bogs. y. Sand 
places. *P, vi VII. i Roar tat 
7. E. hyemale(L.); st. simple very rough with 14—20 slender 
furrows, sheaths close whitish but the top and bottom black, teeth 
slender black deciduous.—E. B. 915. N.17.—St. 1—2 ft. high, 
simple. Catkin with an apiculus. Sheaths widest at their top, 
at first green 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. VIII. 
8. E. Mackaii (Newm.); st. simple or very slightly branched 
very rough with 8—12 furrows, sheaths close ultimately wholly 
black, teeth slender persistent.—N. 24. E. elongatum Hook. not 
Willd. E. trachyodon (Braun) Koch?—St. 1—3 feet high, 
simple or with solitary distant branches. Catkins with an api- 
culus. Sheaths quite cylindrical, pale green with a black band 
beneath the oath Out ultimately wholly black. Teeth much more 
persistent than in the preceding, usually black.—Mr. Newman 
has shown (Phyt. i. 306.) that this is not the E. elongatum 
(Willd.), the European form of which is the same as E. ramo- 
sissimum (Desf.) and E. ramosum (Schleich.) Koch.—Mountain 
glens. P. VII. VIII. 
9. E. variegatum (Weber and Mohr); st. simple or very 
slightly branched very rough with 4—10 furrows, sheaths slightly 
enlarged upwards green below black above, teeth obtuse each 
tipped with a deciduous bristle-—N. 31.—St. about a foot high, 
erect, usually simple except at the base. Lower half’ of the 
sheaths green like the stem, upper part black ; teeth persistent, 
ovate, black in the centre, with a white membranous margin. 
Catkin apiculate.—8. arenarium; st. procumbent, usually more 
slender, teeth of the sheaths wedgeshaped. LE. variegatum Sm., 
E. B. 1987.—y. Wilsoni (Newm.); st. erect tall (3 ft.), sheaths 
with a black rmg at the summit, teeth short obtuse. N. 39.— 
Wet places, or in water, chiefly in mountainous districts. 8. sandy 
places near the sea. y. “in a ditch at Mucruss, Killarney.” Mr. 
W. Wilson. P. VII. VUI. 
