Populus.] SALICINEA. 267 
nor, indeed, in the British Isles unless the former is so in the 
south of England. Several fine trees occur about Listowel, 
Killarney, &c. ; one near Ross Castle almost beside the Lower 
Lake, measured in 1904, was 12 feet 8 inches in girth at 
3 feet from the ground, while another near by was 13 feet 
8 inches at the same height.] 
EMPETRACESA. 
EMPETRUM Linn. 
E. nigrum Linn. Crow-berry. 
Districts I. II. I. IV. V. VI. VII. VI. IX. 
Native. On heaths, usually at a high elevation. Common 
as a mountain plant, rare at low levels. A dwarf trailing 
shrub. April—June. Calcifuge A. 
Low-level stations are—II. Abundant on the Abbey 
Island, Darrynane (R.W.S.) Cyb. 1898, and at the west end 
of Lamb’s Head, from 100 to 325 feet above sea-level, 1904 : 
R.W.S.—III. On the western face of Bolus Head, Ballin- 
skelligs Bay, 1906, and abundant on Doulus Head, Valencia 
Harbour, 1908 : Miss Delap.—V. Near sea level on Brandon 
Head : Hart 1884. At about 700 feet on the Great Blasket 
Island : Barrington 1881.—VIII; In several places on Kerry 
Head: R W.S. 1889—IX. On heaths south-west of Bally- 
bunnion: Stewart 1890. 
From sea-level, to 3,314 feet on the summit of Beenkeragh, 
Reeks (Hart). 
First record in 1804: Wade Rar. ‘“ Near Killarney on 
Mangerton, Turc, and Purple mountains.” 
This plant occurs on nearly all the Kerry mountains above 
2,000 feet in height, often in great abundance. It rarely 
descends on them below 1,600 feet, a gap of 1,400-1,200 feet 
generally separating the mountain from the lowland stations. 
The berries are said to be greatly esteemed by grouse. 
CERATOPHYLLES. 
CERATOPHYLLUM Linn. 
C. demersum Linn. — Hornwort. 
District — — — — ~—~ VWI — ~— — 
Native. In still water. Very rare and local. Peren. 
June—July. 
VI. Abundant in a pool at the foot of Ross Castle, Kil- 
