Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1950, in volume 16, pages 1-2
Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1950, in volume 16, pages 3-13
Published in Journal of South African botany, in 1950, in volume 16, pages 15-22
Published in Journal of South African botany, in 1950, in volume 16, pages 23-38
Published in Journal of South African botany, in 1950, in volume 16, pages 39-45
Published in Journal of South African botany, in 1950, in volume 16, pages 47-53
Published in JOURNAL OF SOUTH AFRICAN BOTANY, in 1950, in volume 16, pages 55-177