LITERATURE
- Thunberg , C. P. —Travels in Europe, Africa, and Asia, 1770–1779, 2nd English edition, 1795, pp. 167 and 290
- Smith , A. —A Contribution to South African Materia Medica, 2nd edition, 1888, pp. 47 and 58
- Marloth , R. —A Dictionary of the Common Names of Plants, 1917, pp. 12 and 125
- Gadamer , J. —Lehrbuch der chemischen Toxikologie, 1909, pp. 428 and 439