Published in Sida, Contributions To Botany, in 1970, in volume 3, issue 7, pages 451-465

Published in Sida, Contributions To Botany, in 1970, in volume 3, issue 7, pages 466-503

Published in Sida, Contributions To Botany, in 1970, in volume 3, issue 7, pages 504-524

Published in Sida, Contributions To Botany, in 1970, in volume 3, issue 7, pages 525

Published in Sida, Contributions To Botany, in 1970, in volume 3, issue 7, pages 533-536