214 JOURNAL OF THE PLYMOUTH INSTITUTION. 
the two Elms, Ulmus suberosa and Ulmus montana; Carpinus 
Betulus (Hornbeam); and six Willows, Salia fragilis, S. alba, S. 
triandra, S. viminalis, S. Smithiana, and S. ferruginea. It is 
quite possible some of these willows may be indigenous. 
The Aliens, Tilia intermedia (Lime) and Castanea vesca (Chest- 
nut) complete our catalogue. 
Probably the Hazel is the most abundant and general of all our 
hedge-row bushes, though in certain spots we find the Oak pre- 
dominating, and in some places the Common Elm is very plentiful, 
though a decidedly local species as regards the whole area. The 
Ash occurs in well-nigh all our hedges, though it does not often 
form long continuous lines in them like the Hazel, and sometimes 
the Oak, being rather dotted in amongst the other things. The 
Sycamore is principally met with at no great distance from houses. 
In damp spots the Common Sallow generally appears, intermixed 
perhaps with Alder. The above, with some Hawthorn, Sloe, and 
Wild Cornel, are the chief constituents of our hedge-rows. 
I now proceed to make some remarks on a few of the species 
enumerated in my lists, dealing to-night with those belonging to 
the order Rosacee, several of which are of peculiar interest from 
the connection between them and our cultivated Plums, Cherries, 
Pears, or Apples. These all belong either to the genus Prunus or 
Pyrus, Under the former we find three bushes that all come under 
the aggregate P. communis of Hudson, but appear in the London 
Catalogue, and in my lists, as P. spinosa, P. insititia, and P. 
domestica; in other words, the Sloe, Bullace, and Wild Plum. 
Concerning them there is abundant room for critical remarks; for 
whilst some leading botanists regard the three as distinct species, 
several consider them varieties of but one variable species, and 
others adopt an intermediate course by applying to them the term 
sub-species. Let us see how they are dealt with in some of the 
best known works on British botany. Watson, in the London 
Catalogue of British Plants, ed. 7, and Smith, in English Flora, 
have alike sp. 1, spinosa; sp. 2, insititia; sp. 8, domestica. Dr. 
Boswell, in English Botany, ed. 3, and Sir Jos. Hooker, in 
Students’ Flora, sub-sp. 1, spinosa; sub-sp. 2, insititia ; sub-sp. 8, 
domestica. Babington, in Manual of British Botany, has Prunus 
communis: variety 1, spinosa; var. 2, insititia; var. 8 domestica. 
Bentham, in British Flora, has 1 species, P. communis, adding 
some remarks on its varieties. 
