Published in Gardens' Bulletin, Singapore, in 1972, in volume 26, issue 1, pages 49-61
Created: 2016-08-10, modified: 2016-08-10![](https://www.biodiversitylibrary.org/pagethumb/43666587,60,60)
Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 1-11
Created: 2018-12-17, modified: 2018-12-17![](https://www.biodiversitylibrary.org/pagethumb/43616050,60,60)
Published in Gardens' Bulletin, Singapore, in 1987, in volume 40, issue 1, pages 15-30
Created: 2016-07-14, modified: 2016-07-14