Although bearing the name wood sage (Teucrium scorodonia) it is not a woodland plant as one might assume. It is much more frequently found on dry, sandy and acidic soils and, in Dorset, that generally means heathland although not exclusively so. I suspect the name wood sage comes from the woody texture of its stem rather than its preferred habitat.
Wood sage is very common in the right habitat and is quite unmistakeable being a stout plant, growing to between one and two feet tall. As I say, it has a sturdy stem and pointed, pale, downy leaves. The flowers are small, pale greenish yellow trumpets that run down the stem. There is no other flower that comes to mind that is quite like it. It is a member of the germander family which are related to mints (or labiates) and bear many features of this group of plants. It is also known as wood germander.
This plant flowers from July to September but is visible virtually all year round as it is a sturdy perennial. Although sharing a name with sage, the garden herb, wood sage has little scent or flavour and is of little use in the kitchen!