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Burrows, J.E. & Willis, C.K. (eds) (2005). Plants of the Nyika Plateau Southern African Botanical Diversity Network Report No. 31 SABONET, Pretoria Page 260.
Chapano, C. & Mamuto, M. (2003). Plants of the Chimanimani District National Herbarium and Botanic Garden, Zimbabwe Page 4.
Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 77. Under Scrophulariaceae
Philcox, D. (1990). Scrophulariaceae Flora Zambesiaca 8(2) Pages 86 - 90.
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