The Botany of Iceland - 01.12.1942, Qupperneq 341

THE PTERIDOPHYTA AND SPERMATOPHYTA OF ICELAND
339
355. Limosella aquatica Linn., Sp. pl. ed. I (1753) p. 631.
K. & M., 1770, p. 208.—Babington, 1871, p. 320,—Gronlund, Isl. Fl., 1881,
p. 65.—Stefánsson, Fl. ísl., ed. 1, 1901, p. 169.—Ibid., ed. 2, 1924, p. 191,—
O. & Gr., 1934, p. 123.
Flora Dan. tab. 69.
Icelandic: Efjugras. Danish : Dyndurt. English : Mudwort.
Rather common in the southwestern parts, otherwise here and there, but only
occurring in the lowland. See fig. 153.
var. borealis Less. is a dwarfish form, without stolons; leaf blades not, or very
little, broader than the stalks; here and there, often with transitional forms to the
common form.
Life-form : Th.
On mud, in shallow lakes near the shore, in ponds and pools; often submerged;
near hot springs, etc.
Flor. VII—VIII ; fr. mat. VII—VIII.
Max. height: 6 cm ; average : 3 cm.
Geogr. area: Am. : Labrador to New Jersey, and in the far North and West.—
Greenl.: W. 61°2' and 61°13'.—Eur.: E.S.I.; northern and central Eur., southward
to Italy.—Asia : Siberia ; Himalaya.—Afr.: Abyssinia, Egypt.—Australia.
Linaria vulgaris Linn.
A sterile specimen was found in a grass field at Hornafjörður in July 1934, by
Miss Aase Jorgensen. No doubt it has been introduced with foreign seed.
356. Melampyrum sylvaticum Linn., Sp. pl. ed. I (1753) p. 605.
Stefánsson, 1896, p. 148.—Idem, Fl. tsl., ed. 1, 1901, p. 167.—Ibid., ed. 2,
1924, p. 189.—O. & Gr., 1934,
p. 120.
Flora Dan. tab. 145.
Icelandic : Krossjurt. Danish : Skov-Kofode.
English: Horse-flower, Alpine Cow-wheat.
M. sylvaticum was first found by Ste-
fánsson in 1893, at Laugabólsdalur near the
head of Isafjörður, where it was growing
rather abundantly. Recently it has been
found in several places at ísafjörður, and
in some valleys on the southern coast of
the Vestfirðir Peninsula: Kollabúðir, in
Þorskafjörður, Djúpidalur, in Djúpifjörður
and Gufufjörður (G.Þ., 1938). See fig. 154.
The Icelandic plant seems to answer
fairly well to the description of the f. larice-
torum (Kern.) Ronniger, in Vierteljahrsschr.
d. naturf. Gesellsch. Zúrich, LV (1910)
p. 327. Stem 10—15 cm high, simple, rarely
with a pair of sterile branches. Cotyledons
still persisting on the flowering plant. Flowers
in the axils of the second or third pair of Fig. 154. Melampyrum sylvaticum L.
22*