http://wiki.openstreetmap.org/wiki/Tag:natural%3Dfell
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HB: heath is already used for mixed scrub, so I propose we use fell (meaning mountain grass).
http://en.wikipedia.org/wiki/Fell
or we could just use a custom natural=tussock.
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RP: interesting - wp lists nz tussock as unique worldwide http://en.wikipedia.org/wiki/New_Zealand_tussock_grasslands
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