Scrub areas are composed of birch, hawthorn Crataegus monogyna, gorse " Ulex europaeus ", blackthorn " Prunus spinosa " bramble " Rubus fruticosus " and creeping soft-grass " Holcus mollis ".
12.
The exact origin of " Prunus domestica " subsp . " insititia " is still extremely debatable : it is often thought to have arisen in wild crosses, possibly in Asia Minor, between the sloe, " Prunus spinosa ", and the cherry plum, " Prunus cerasifera ".
13.
Like other varieties of " Prunus domestica ", the bullace may have had its origin in hybrids between the sloe ( " Prunus spinosa " ) and cherry plum ( " Prunus cerasifera " ), though there is also evidence that " domestica " was solely descended from the latter.
