CXvi PROCEEDINGS—PERTHSHIRE SOCIETY OF NATURAL SCIENCE. 
Perthshire distribution, and in its Tay marsh station has as compan¬ 
ions some undoubted aliens, yet in all three places in which it occurs 
it is associated with other rare and local plants which are admitted to 
be native. It seems to me, therefore, that there is more evidence in 
favour of the species being indigenous than there is for its being an 
introduction. It is widely distributed in Britain south of Perthshire, 
and is not marked in any list as being otherwise than native. 
Euphorbia Helioscopia , L.—A weed of cultivation. 
E. Pephis , L.— A weed of cultivation, confined almost to garden 
ground. 
E. exigua , L.— A rare weed of cultivation. 
Urtica urejis , L. — Restricted to the neighbourhood of houses, and 
hence dependent in some manner upon man. 
V dioica, L.—Although this occurs in wild enough places, as, e.g., 
high up on the mountains, it seems to be also a species dependent 
upon man. To the mountain ledges where it occurs it has probably 
been brought by sheep. 
[Populus alba , L.—A doubtful native of Britain. With us it never 
occurs but as a planted tree. Doubt has been expressed as to 
whether it flowers in Scotland. It flowers regularly here.] 
Salix iria?idra , L. — “ Doubtfully native of Scotland ” (Student’s 
Flora). It is impossible to say whether this willow is native or not. 
Self-sown and wild-looking plants occur, and I think that it is probably 
indigenous. 
S. alba, L. — “Always? planted” (Student’s Flora). Possibly not 
indigenous, but self-sown trees are not unfrequent. 
S. fragilis, L.—“ ? Native in Scotland ” (Student’s Flora). I think 
that we may claim this as probably native. 
Polygonatum verticillatum , All. — Watson thought that this was an 
“uncertain native.” It thus, like Lathyrus niger , affords an example 
of how an unquestionably indigenous species may be regarded with 
suspicion. Those who know it in its Perthshire habits can have no 
reason to believe that it is otherwise than thoroughly wild. 
Convallaria maialis , L.— “Naturalized in Scotland” (Student’s 
Flora). There is no doubt but that this is occasionally planted. At 
the same time it is evidently indigenous in several places, as in 
Methven Wood, about Pitlochry, and at Killiecrankie. 
Allium Scorodopi'asum, L.—The books admit this to be a native 
of Perthshire, while A. carinatum , L., is considered to be only natural¬ 
ized. The British distribution of these two is very different, but, so 
far as I have seen them in Perthshire, they must both come in the 
same category, although A. Scorodoprasjim is very scarce and A. cari- 
natum very abundant on the banks of the Tay below Perth. If one 
is a naturalized plant, so, I think, is the other. 
A. oleraceum, L. —This garlic may perhaps be also looked upon 
with suspicion. In some of its stations, however, it seems to be wild. , 
