380 
EQUISETACE/E. 
2. E. Drummondii (Hook.) ; sterile st. with about 20 striae 
very scabrous with prominent points particularly above, branches 
simple with 4 simple angles, fertile st. simple with numerous 
crowded deeply toothed sheaths. — E. B. S. 2777- — Sterile st. 
1 — 1% foot high, nearly naked below, with numerous whorls of 
slender simply 4-angled branches in the upper part ; general out- 
line remarkably obtuse at the top. Fertile st. short, with nu- 
merous yellowish-white sheaths with black prominent ribs up- 
wards and 12 — 14 teeth. — This appears to be the E. arvense of 
the Linn. Herb. — Wet places, rare. P. IV. S. I. 
3. E. arvense (L.); sterile st. with few furrows slightly sca- 
brous, branches simple rough with 4 simple angles, fertile st. 
simple with few lax distant sheaths. — E. B. 2020. — Sterile st. 
numerous, procumbent or ascending, with numerous whorls of 
numerous roughish simply 4-angled branches ; general outline 
attenuated upwards. Fertile st. short, with few (4 — 5) sheaths. 
— Damp meadows. P. IV. 
** Sterile and fertile stems similar, simple or branched. 
4. E. sylvaticum (L.) ; sterile and fertile st with about 12 fur- 
rows and numerous whorls of slender compound spreading or 
deflexed branches, sheaths lax with 6 — 10 membranous rather 
blunt teeth.— E. B. 1874.— St. 12—18 in. high. General out- 
line of the sterile st. pyramidal, of the fertile abrupt. — Wet 
shady places. P. IV. V. 
5. E. limosum (L.) ; st. smooth with 14 — 16 slight furrows, 
teeth of the sheaths short rigid acute, branches erect simple 
whorled often abortive. — E. B. 929- — Usually growing in water. 
St. about 2 feet high, very smooth, simple below. Sheaths ra- 
ther short with quite distinct short dark brown acute teeth. 
The branches are often not produced. — In stagnant water. P. 
VI. VII. 
6. E. palustre (L.) ; st. with 6 — 8 deep furrows branched 
throughout, sheaths loose pale with acute wedgeshaped teeth 
tipped with brown and membranous at the edges. — E. B. 2021. 
— St. slightly rough. Catkin without an apiculus. Sheaths the 
colour of the stem or paler ; membranous margins of the brown 
teeth nearly transparent. Occasionally on mountains the angles 
and teeth are fewer. — Spongy bogs. P. VI. VII. 
7. E. hyemale (L.) ; st. simple very rough with 14 — 20 slender 
furrows, sheaths close whitish but the top and bottom blaclc, teeth 
slender black deciduous. — E. B. 915. — St. 1 — 2 feet high, simple. 
Catkins with an apiculus. Sheaths widest at their top, at first 
green with a black crenate rim, then entirely black and ultimately 
pale in the middle and black above and below. — Damp banks 
and woods. P. VII. VIII. 
