The photo attached is of a small shrub in a local coastal reserve outside Warkworth, there are a number of specimens growing under pohutukawas and around the area which also contains privet and other weed species. The habit is as per the photo - most are around a metre tall and given the time of year there is no fruit or flower to assist although one appeared to have small spike inflorescence. Suspect it is an undesirable such as a rhamnus or privet sub-species of some description but haven't been able to confirm from viewing many images. Any ideas welcome