Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 1-90

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 91-131

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 132-147

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 148-160

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 161-169

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 170-176

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 177-179

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 180-183

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 184-186

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 189-201

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 203-208

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 209-222

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 223-225

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 229-238

Published in Gardens' Bulletin, Singapore, in 1981, in volume 34, issue 1, pages 239-242