Research suggest losses of Scotland's upland species including snow pearlwort could be down to declining snow cover.
Data used to produce the report included more than three million plant records of 2,555 species collected by hundreds of botanists across Scotland.
Peatbog and moorland were other habitats deemed to be at threat - particularly from the spread of Sitka spruce, a non-native tree. "Its ability to regenerate successfully on peaty soils that are vital for native biodiversity and carbon sequestration means that future planting will need to be carefully managed to ensure that these important peatland habitats are protected."
Last summer, University of Stirling researchers said climate change had pushed Scotland's rare arctic-alpine plants to the brink of extinction.
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