There are about 400 clerodendrum species in the genus that falls in the verbenaceae family. Among them are trees, climbers and shrubs. The specimen in the photo resembles the 'blue butterfly', C. ugandense. The proper name may now be Rotheca hirsuta.  It is a perennial herb with angular stems, (according to www.plantzafrica.com) and occurs widely on southern African grassland.

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Judd Kirkel