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The books tell me that Mentha suavolens has reflexed (turned under the blade) leaf teeth, whilst its hybrid Mentha x villosa has patent (roughly coplanar with the blade) leaf teeth.
The books also tell me that the leaf shape of Mentha x villosa is variable, but includes round-leaved forms.
Lat/Lng: 53.1529, -1.2881
OS grid ref: SK477619
In Silverhill Country Park, land reclaimed from old colliery workings and spoil tips.