You chose as the main characteristic : 2. WOODLAND EDGE. Plants for a more or less open space with an occasional tree or shrub. In principle occasionally some sun.

The links below lead you to the third level

Plants close to trees or shrubs, but in the sunshine.

Plants between trees or shrubs, mostly light shade.

The links below lead you to the list of perennials that all share the main characteristic plus :

Plants close to trees or shrubs, but in the sunshine.

Plants between trees or shrubs, mostly light shade.