Streptocarpus cyaneus subsp. cyaneus is a stemless perennial reaching 20 cm in height. The soft plant grows from a horizontal rhizome.
It is closely related to S. rexii that bears bigger flowers without yellow throats and grows further to the south.
The subspecies distribution is in a part of Mpumalanga near the escarpment and its foothills, also in Eswatini.
The habitat is mostly forest floors near water and shaded, damp, rocky places. The subspecies is not considered to be threatened in its habitat early in the twenty first century (Manning, 2009; Onderstall, 1984; Germishuizen and Fabian, 1982; Letty, 1962; iNaturalist; http://pza.sanbi.org; http://redlist.sanbi.org).