Hydrangea macrophylla subsp. macrophylla 'Pia'

Dwarf plant to 30 cm or so tall, sometimes reverting to a larger form, especially when fed well. Flower clusters small, pink, compressed, the centre whitish. Sepals of different sizes and with tiny teeth, pointed when young.Origin unknown. ['Pia Mina' a New Zealand-raised dwarf cultivar with foliage colouring well is possibly the same as above]