Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1951, in volume 17, pages 1-48
Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1951, in volume 17, pages 49-72
Published in Journal of South African botany, in 1951, in volume 17, pages 73-75
Published in Journal of South African botany, in 1951, in volume 17, pages 77-82
Published in Journal of South African botany, in 1951, in volume 17, pages 83-92
Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1951, in volume 17, pages 93-166
Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1951, in volume 17, pages 167-188
Published in Journal of South African botany, in 1951, in volume 17, pages 189-194