Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1957, in volume 23, pages 1-12

Published in Journal of South African botany, in 1957, in volume 23, pages 15-17

Published in Journal of South African botany, in 1957, in volume 23, pages 19-37

Published in Journal of South African botany, in 1957, in volume 23, pages 43-63

Published in Journal of South African botany, in 1957, in volume 23, pages 65-73

Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1957, in volume 23, pages 75-102

Published in Journal of South African Botany, in 1957, in volume 23, pages 103-104

Published in Journal of South African botany, in 1957, in volume 23, pages 105-109

Published in Journal of South African botany, in 1957, in volume 23, pages 111-119

Published in Journal of South African botany, in 1957, in volume 23, pages 121

Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1957, in volume 23, pages 123-125

Published in Journal of South African botany, in 1957, in volume 23, pages 127-137

Published in Journal of South African botany, in 1957, in volume 23, pages 139-149