The Botany of Iceland - 01.12.1942, Blaðsíða 259
THE PTERIDOPHYTA AND SPERMATOPHYTA OF ICELAND
257
Crassulaceae.
236. Crassula aquatica (L.) Schoenland in Engl. u. Prantl, Nat.
Pflzfam. II, 2a (1891) p. 37.
Tillaea aquatica, K. & M., 1770, p. 205.—Bulliarda aquatica DC., Babington,
1871, p. 307.—Gronlund, Isl. Fl., 1881, p. 58.—Stefánsson, Fl. ísl., ed. 1,
1901, p. 121.—Crassula aq. (L.) Schönl., Ibid., ed. 2, 1924, p. 137.—B. aq.
(L.) DC., H. Jónsson, 1909, p. 32.—
C. aq. (L.) Schönl., O. & Gr., 1934,
p. 81.
Flora Dan. tab. 1510.
Icelandic: Vatnsögn. Danish: Dværgurt.
English: Piging-weed.
First recorded by K. & M., loc. cit.,
without locality; Zoega, 1772, p. 4, records
it from Laugarvatn, S., and later on, in
1907, Helgi Jónsson found it growing
abundantly both at Laugarvatn and at the
hot springs at Laugarás near Skálholt (H.J.,
loc. cit.). See fig. 103.
Life-form : Th.
In shallow water in ponds and pools, on damp soil near hot springs.
Flor. VI—VII; fr. mat. VIII.
Max. height: 2 cm; average : 1 cm.
Geogr. area: Am.: N. Am. Quebec to Maryland and southward ; California.—Eur.:
Scandinavia and Russia, from 63°45' lat. N., southward to central Eur.—Northern
Asia. Ussur Prov., Japan, Korea.
237. Sedum acre Linn., Sp. pl. ed. I (1753) p. 432.
K. & M., 1770, p. 207.—Babington, 1871, p. 307.—Gronlund, Isl. Fl., 1881,
p. 57.—Stefánsson, Fl. ísl., ed. 1, 1901, p. 120.—Ibid., ed. 2, 1924, p. 135.—
O. & Gr., 1934, p. 82.
Flora Dan. tab. 1457.
Icelandic: Helluhnoðri. Danish : Bidende Stenurt. English: Biting Stone-crop, Wall-
Pepper.
Seems to be frequent, even common, in most parts of the lowland; also found
in several localities of the central highland : Arnarfell hið mikla, and at Hvítárvatn
(J.Gr., 1934). Grágæsadalur (copious), Lindafell (S.S.).
In many places it is very seldom seen flowering.
Life-form : Ch.
On gravelly and sandy, dry soil, in rocks, on sunny slopes.
Flor. VII—VIII (IX); fr. mat. (?).
Max. height: 9 cm; average: 4 cm.
Geogr. area: Am.: (naturalized from Eur.) Quebec to Ontario, southern New
York, Virginia.—Greenl.: E. 65°30'—66'.—Eur.: E.S.I.; throughout Europe from
northern Scandinavia and Russia southward. Caucasus.—Western and northern Asia,
southward to Altai, Asia Minor.—North Africa.
The Botany of Iceland. Vol. IV. Part I.
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