Published in Journal of South African Botany, in 1955, in volume 21, pages 1-8

Published in Journal of South African botany, in 1955, in volume 21, pages 9-50

Published in Journal of South African Botany, in 1955, in volume 21, pages 51-53

Published in Journal of South African botany, in 1955, in volume 21, pages 55-57

Published in Journal of South African botany, in 1955, in volume 21, pages 59-61

Published in Journal of South African botany, in 1955, in volume 21, pages 77-82

Published in Journal of South African botany, in 1955, in volume 21, pages 83-95

Published in Journal of South African Botany, in 1955, in volume 21, pages 97-99

Published in Journal of South African Botany, in 1955, in volume 21, pages 101-108

Published in Journal of South African botany, in 1955, in volume 21, pages 109-154

Published in Journal of South African Botany, in 1955, in volume 21, pages 155-217

Published in Journal of South African Botany, in 1955, in volume 25, pages 51-68