Greinar (Vísindafélag Íslendinga) - 01.01.1967, Page 14

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Thus altogether 183 species of foreign plants had been
found growing in a wild state in the period 1900—1966,
not counting those foreign plants already permanently
established before 1900. Of these 26 may be said to have
become well established, while an additional 7—10 spe-
cies are probably just about to become so. The remainder
are of more irregular occurrence. (Some foreign Taraxa-
cum “species” seem to have become permanently esta-
blished but this remains to be studied closer). This is com-
parable with the number of species thought to have become
established in the country from the beginning of the settle-
ment (about 874) up to about 1960 (Steindórsson 1962).
Of these 183 species, 26 belong to Cruciferae, 28 to
Graminae, 25 to Compositae, 18 to Leguminosae, while
fewer species belong to other families.
The 26 permanently established species are the fol-
lowing:
Alopecurus pratensis
Avena pubescens
Bromus inermis
Dactylis glomerata
Holcus lanatus
Lolium perenne
Sieglingia decumbens
Allium oleracium
Rumex crispus
Cerastium glomeratum
Stéllaria graminea
Barbarea vulgaris
Rorippa silvestris
Trifolium pratensis
Aegopodium podagraria
Anthriscus silvestris
Myrrhis odorata
Myosotis pálustris
Lamium amplexicaule
L. purpureum
L. album
Veronica chamaedrys
Achillea ptarmica
Tussilago farfara
Chrysanthemum leucanthemum
Matricaria matricarioides
Records of foreign species at some selected
localities.
By far the greatest number of foreign species are found
in SW-Iceland, and especially in and around Reykjavík.
But many species are also found outside this areas,
especially in towns and noteably in or near the second
largest town, Akureyri, N-Iceland. In the accompanying
tables the foreign species recorded from 20 localities are