| Author | Title | Journal/publisher | Literature ref. no. |
| Beard, J.S. (1963) | The genus Protea in Tropical Africa | Kirkia 3 138-206 | 661 |
Note that the process of capturing references from species to the literature and the reverse may be incomplete.
| Species found: 4 |
| Protea angolensis var. trichanthera |
| Protea gaguedi |
| Protea madiensis subsp. madiensis |
| Protea petiolaris subsp. petiolaris |