Cape edelweiss, lambtails, or horse snow are all common names for Lanaria lanata. This is a species of “onlys”: it is the only species in its genus, which is the only genus in its family. It is also only found in South Africa, where it is restricted to the Western Cape and Eastern Cape provinces.
Lanaria lanata is associated with the highly-biodiverse fynbos, or the shrublands / heathlands of South Africa. Fires are a natural component of this Mediterranean-type ecosystem. Indeed, Cape edelweiss flowers best in the years immediately following a fire, similar to many other fire-adapted monocots. Perhaps someone who has seen the plant in the wild can comment as to whether or not the flowering stems wiggle in the wind like a lamb’s tail?
Additional photographs are available via African Plants: A Photo Guide.
Botany resource link: On the topic of ecosystems with fire regimes, Hakai Magazine recently published an article on Coastal Oakscapes. Richly photographed, it introduces some of the people and plants involved with British Columbia’s Garry oak ecosystems (or Oregon white oak ecosystems, for readers further south).