Jack is correct. The President of a Clan Society may also wear two feathers, if I'm not mistaken.

I know in the Clan Scott Society, the elected President of the Society is titled 'Chieftan' and is accepted as a clan chieftan by the heraldic chief of Clan Scott. (I don't want to start a big discussion here about 'what constitutes a clan'. Essentially, a Clan Society is an incorporated collection of folks with the name of, or relatives/ancestors with - but not necessarily blood-kin related to - the original clan or one of the generally accepted septs. Seeing as how the clan system broke down over 200 years ago, I imagine it would be difficult to ascertain an actual blood-kin relationship to a chief or one of the septs.)

If you want to put a piece of plant on your Balmoral, wyld, why not a spring of heather or thistle? They're generally identified with Scotland, and most people wouldn't really know the difference anyway. (I know I wouldn't.)