The Botany of Iceland - 01.12.1942, Blaðsíða 256

254
JOHS. GRONTVED
(L.) R.Br., Grenlund, Isl. Fl., 1881, p. 42.—JV. pal. (Leyss.) DC., Stefáns-
son, Fl. ísl., ed. 1, 1901, p. 108.—Radicula isl. (Oeder) Druce, Ibid., ed. 2,
1924, p. 120.—Roriþpa islandica (Oed.) Schinz & Thellung, O. & Gr.,
1934, p. 74.
Flora Dan. tab. 409 (Sisymbrium islandicum) & tab. 931 [N. palustre).
Icelandic: Kattarjurt. Danish: Kær-Guldkarse. English: Marsh Water Cress.
In N. found in many places from Eyjafjörður eastward to Jökulsá á Fjöllum,
especially in the country around Mývatn. It also occurs frequently in S. and S.W.,
and is recorded from N.W. (Isafjörður, cp. St.St., 1924, p. 121). Not found in E.
or in the central parts. See fig. 100.
Life-form : H.
On moist sandy and gravelly soil; often at hot springs.
Flor. VII—VIII; fr. mat. VII—IX.
Max. height: 40 cm; average: 15 cm. ,
Geogr. area: Am.: Throughout N. Am. except the extreme north.—Greenl.: W.
(introduced) Ivigtút.—Eur.: Fær.; E.S.I.; in Scandinavia from Varanger south-
ward to central Eur., Caucasus.—Asia.—Africa.—Australia. New Zealand.
Sinapis alba Linn.
Helgi Jónsson, 1896, p. 342.—Stefánsson, Fl. tsl., ed. 1, 1901, p. 103.—Ibid., ed. 2,
1924, p. 115,—O. & Gr., 1934, p. 70.
May, like S. arvensis, be found introduced, but it is very rare (Akranes, S.W.
(B.Ó., 1891), Stakkahlíð, E. (H.J.)).
Sinapis arvensis Linn.
Gliemann, 1824, p. 145.—Babington, 1871, p. 293.—Granlund, Isl. Fl., 1881, p. 49.
-—Stefánsson, Fl. ísl., ed. 1, 1901, p. 103.—Ibid., ed. 2, 1924, p. 115.—O. & Gr.,
1934, p. 70.
Accidentally introduced or occurring as an escape from culture; in some places
in cultivated areas as a weed around farmsteads and towns, in N. and S.W. Not
naturalized in Iceland.
Sisymbrium officinale (L.) Scop.
Helgi Jónsson, 1896, p. 342.
Accidentally introduced (Haugar, E.).
Sisymbrium altissimum L.
S. Sinapistrum Crtz., H. Jónsson, 1896, p. 342.—Stefánsson, Fl. Isl., ed. 1, 1901,
p. 111.—Ibid., ed. 2, 1924, p. 125.—S. altissimum L., Stefánsson, 1919, p. 35.—
S. Sinap. Crtz., O. & Gr., 1934, p. 70.
Accidentally introduced; found in two places in N.: Rif (St.St., 1895) and
Þverá in Svarfaðardalur (Elinor Þorleifsson, 1917); further, in one place in E.:
Haugar (H.J., 1894).
234. Subularia aquatica Linn., Sp. pl. ed. I (1753) p. 642.
Mohr, 1786, p. 198.—Babington, 1871, p. 295.—Granlund, Isl. FL, 1881,
p. 46.—Stefánsson, Fl. ísl., ed. 1, 1901, p. 107.—Ibid., ed. 2, 1924, p. 119.—
O. & Gr., 1934, p. 72.
Flora Dan. tab. 35.
Icelandic : Alurt. Danish : Sylblad. English : Water Awl-wort.
In N. found in many places. In E. in a few localities at Lagarfljót. In S. in