Rusty-haired Saxifrage (Saxifraga rufidula) May 7, 2013 / Dave Ingram The cog-edged leathery leaves of the Rusty-haired Saxifrage (Saxifraga rufidula) are often rusty-hairy underneath. The cog-edged leathery leaves of the Rusty-haired Saxifrage (Saxifraga rufidula) are often rusty-hairy underneath.