In 1997 Senecio articulatus was placed in the genus Curio, together with a number of other succulent Senecios. As the changes were published in a not very well known journal, they have not been generally accepted (yet?).
Poor old S. articulatus must be in an identity crisis by now, because since it was named first, it has been placed in four different genera (Cacalia, Kleinia, Senecio and now Curio).
Maybe we should just stick to the beautifully descriptive Afrikaans name Worsies (sausages).
The species is widespread from Montagu to Uitenhage, on rocky slopes, usually in (partial) shade.