Senecio also referred to as the string of pearls, is a popular succulent that is treasured for its delicate, attractive look and easy care. This plant is native to South Africa and is a tracking or climbing succulent that can mature to several feet long. The Senecio plant is part of the larger aster family, and it is among the most distinct succulents you can grow. 30 Types Of Popular Senecio Pictorial Guide.