The Botany of Iceland - 01.12.1942, Blaðsíða 93

B. Special Part
ENUMERATION OF VASCULAR PLANTS AND
THEIR DISTRIBUTION
Equisetaceae.
1. Equisetum arvense Linn. Sp. pl. ed. I (1753) p. 1061.
K. & M., 1770, p. 211.—Babington, 1871, p. 345.—Gronlund, Isl. Fl., 1881,
p. 137.—Stefánsson, Fl. ísl. cd. 1, 1901, p. 9,—Ibid. ed. 2, 1924, p. 9,—
C.H.O., Fl. arct. 1902, p. 10.—O. & Gr. 1934, p. 4.
Flora Dan. tab. 2001.
Icelandic: Klóelfting. Danish : Ager Padderokke. English : Field Horsetail.
Common throughout Iceland, in the lowland as well as in the central highland ;
it may be found even in the most barren and exposed places, often rather abundantly.
It occurs in practically all types of associations as well as in nearly all kinds of soil,
dry and wet, and, according to the nature of the habitat, it is very varying. It would
take us too far here to enter upon a detailed treatment of all the varieties occurring,
it will suffice to quote the more typical forms met with in Iceland :
f. alpestre Wg. 1812 (— f. decumbens Mey.). Fl. Dan. tab. 1942 & 2924.
f. riparium Fr. 1845 (= ? f. rivulare Huth, f. arcticum Rupr.).
f. nemorosum A. Br.
f. campestre (Schult. 1819). Milde (f. serotinum Mey. 1836).
Life-form: G. (Rhizome Geophyte).
In urðs, copses, heaths, on grassy slopes, in swamps and bogs.
Max. height: 50 cm; average: 15 cm (sterile stems). Fertile stems from 3—15
cm high.
Geogr. area: N. Am.: From the Arc'tic Archipelago, southward to Calif. and N.
Carolina.—Greenl.: W. from 60° northwards. E. 60°—79°30\ Eur.: Fær.; E.S.I.;
from northernmost Scandinavia to the Mediterranean. Novaya Zemlya.—Asia: From
the Arctic coast southward to A. Minor and Himalaya.—N. Afr. : Canary Icelands;
Cape.
E. arvense X E. fluviatile (= E. litorale Kíihlew.).
A specimen collected at Vallanes, E., 1893 (H.J.) is determined by O. Gelert,
with some doubt, as this hybrid.
The specimen is, however, sterile and poorly preserved, so that it may be difficult
to corroborate Gelert’s determination.