Like all nerines (including Nerine bodwenii), Nerine undulata is native (and endemic) to South Africa.
Floristically speaking, Nerine undulata is found within the bounds of the Cape Floristic Region, a biodiversity hotspot. There, it is one of roughly nine thousand species of plants that occur in an area one-third the size of the United Kingdom. For comparison’s sake, the entire UK flora contains roughly fifteen hundred species of plants (source: Calflora.net’s Flora of the Western Cape).
There are between twenty-three and thirty species of Nerine; you can see photographs of many of them via the Pacific Bulb Society: Nerine.
Photography resource link: The Art of Disconnection, an article by Niall Benvie on Nature Photographers Online. The piece starts out with a discussion on the recognition (or lack thereof) of the artistic merit of nature photography and ends with a commentary on the decline of natural history in education. I’ll let you decide if the transition between the two points is a smooth one.