Observado.org is a site where people travelling away from home can record observations of plants, animals, etc. It is most used by folks from Belgium and the Netherlands. There are currently over 10.8m observations of which over 360,000 are plants. Narrowing this down a bit, there are currently 239 observations of plants from the Isle of Skye including a few interesting records. Jean-François has put his Beta vulgaris subsp. maritima (Sea Beet) record at Glenbrittle there, and there is a useful record of Parnassia palustris (Grass-of-Parnassus) which localises an older vague record at Lower Breakish.
Many records are accompanied by images which allows confirmation (or otherwise) of the recorded species. Locations are given only as latitude and longitude so it is necessary to convert these coordinates to the British National Grid if they are to fit into the standard UK recording schemes.
The website is not entirely user-friendly towards someone wanting to extract details but with a bit of effort it can be done.
Further afield there are, for example, 33 records for Mull including a new tetrad for Parnassia palustris (Grass-of-Parnassus), two for Okney and two for Fair Isle. Skye seems to especially favoured.