The Hebenstretias belong to the Scrophulariaceae or snapdragon family and are sometimes called slugworts or slakblomme in Afrikaans. Several of them are common in the southern African summer rainfall area, while Hebenstretia robusta is a resident of the Western Cape. The flowers often have slender tubes and conspicuous petal lobes, occurring on erect flower spikes.  This one will not be Hebenstretia dura, H. robusta, H. oatesii or H. dentata as it does not have the orange (or red) patches in the flower throat that those species have.  Are those black spots protruding anthers?