The species occur mainly in mountainous areas of the Western and Eastern Cape provinces from the Cederberg to Uitenhage, with the highest numbers found in the districts of Caledon, Worcester and Swellendam.
Some of the well known families that settled in the region and have stayed for decades are the Barry family, the Moodies from Scotland, the Steyns, the Streicher family, the van Eedens, the Rothmanns, the Tomlinson and the Dunn family
Gert Andries Jacobus Alberts (born 3 January 1836 in Swellendam – died 29 March 1927 in Humpata) was the leader of the First Dorsland Trek.
Two extensions of the line from Caledon were possible: eastwards towards Riviersonderend and Swellendam, with the ultimate possibility of reaching Mossel Bay; or southwards towards Napier and Caledon.
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"Protem" means "for the time being", reflecting the intention to continue the line to Swellendam at some time in the future.