The Botany of Iceland - 01.12.1942, Blaðsíða 94

92
JOHS. GRONTVED
2. Equisetum fluviatile Linn., Sp. pl., ed. I (1753) p. 1062.
K. & M., 1770, p. 211.—E. limosum L., Babington, 1871, p. 345.—Gronlund,
Isl. Fl., 1881, p. 138.—Stefánsson, Fl. Isl. ed. 1, 1901, p. 10.—Ibid. ed. 2, 1924,
p. 10.—C.H.O., Fl. arct. 1901, p. 11 ,—E. fluviatile L., O. & Gr., 1934,
p. 3.
Flora Dan. tab. 1184 and tab. 2925 (E. limosum L.).
Icelandic: Tjarnelfting, Fergin. Danish : Dynd-Padderokke. English : Marsh Horse-
tail.
This species also occurs in the main form var. Linnaeana Döll, Fl. Bad. I, 1855,
p. 64, as also in the var. verticillatum Döll (l.c.).—Most of the specimens in H.H.
belong to the main form, bearing none or very few branches on the stem. Of the
var. verticillatum the f. leþtocladum Döll is found too (Krókur, S.).
Common in most parts of the lowland but seems as yet not to have been found
in the central highland. Where it occurs abundantly it is used for hay-making and
on rather a large scale as a fodder plant for cows and sheep.
Life-form: HH. (Helophyte).
In shallow lakes, in ponds; often in great abundance; also on moist moors, flooded
land, and in other moist places.
Max. height: 100 cm; average: 55—60 cm (sterile stems), 45 cm (fertile stems).
Geogr. area: North Am.: Alaska to Newfoundland and south to Oregon, Nebraska,
Virginia.—Eur.: Fær. ; E.S.I.; northern Europe to the Mediterranean.—Northern
Asia, southward to Asia Minor, Mongolia, Japan.
Equisetum fluviatile X E. palustre (= E. litorale Kiihlew.).
Helgi Jónsson (1896, p. 329) records this hybrid from Valþjófsstaður in Fljóts-
dalur, E.
3. Equisetum hyemale Linn., Sp. pl. ed. I (1753) p. 1062.
K. & M., 1770, p. 211.—Babington, 1871, p. 346.—Gronlund, Isl. FI., 1881,
p. 138.—Stefánsson, Fl. ísl. ed. 1, 1901, p. 11.—Ibid. ed. 2, 1924, p. 11.—
C.H.O., Fl. arct., 1902, p. 9,—O. & Gr. 1934, p. 3.
Flora Dan. tab. 1409.
Icelandic : Eski. Danish : Skavgræs. English : Scouring Rush.
Except for East Icel. whence it is only recorded from one place (Víðidalur), it
is rather common in most parts, in the lowland as also in the central highland. Thus
I found it in many places in the country around Hvítárvatn, 1934; also recorded
from Fagridalur (S.S. 1933), and from Sáta and Kýlingar (S.S. 1931).
Life-form : H.
In copses, on heaths, grassy slopes, sandy and gravelly soil.
Max. height: 40 cm; average: 21 cm.
Geogr. area: North Am.: Southwards to Calif.—Greenl.: (?).—Eur.: Fær.; E.S.I.;
north and central Europe. Caucasus.—N. Asia, south to Mongolia, Korea, Honshu.
4. Equisetum palustre Linn., Sp. pl. ed. I
(1753) p. 1061.
K. & M., 1770, p. 211.—Babington, 1871, p.
346.—Gronlund, Isl. Fl., 1881,.