This is a fine semi-woody plant from Japan where it also has a synonym of Collinsonia.
Easy to grow in a lightly shaded site where the foliage is lance-shaped and will grow from the stiffly erect woody stems. The main attraction are the flowers which are all held at the stem tips in a bottlebrush-like formation. Colour is a nice clean white.
Interestingly, as it dies back into the ground for winter, the roots apparently keep pushing up water. During cold weather, this freezes in the stem but pushes out through the side producing quite attractive 'frost flowers'. Click the link below to see.
Best to cut back fairly hard like a Dogwood in early spring to encourage a bushy habit.