Ecologists tend to talk about the field layer (one of several layers in a wood: ground, field, undercanopy, canopy, emergent). The classic bluebell wood in Britain has no field layer, but many woods have a thick field layer (bracken, brambles etc). This is usually captured in vegetation classifications where the various plants in ground and field layers discriminate between different kinds of wood with the same dominant trees, but I have long thought it might be appropriate to have a distinct tag for these. Use cases: pretty woods (bluebells etc); runnability etc.
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