Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 195-210

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 211

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 213-222

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 223-225

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 227-232

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 233-237

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 239-244

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 245-257

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 259-261

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 263-268

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 269-287

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 289-302

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 303-311