Template:Downie, 1925a
- Downie, D.G. 1925. Contributions to the Flora of Siam. Additamentum XVII. Bulletin of Miscellaneous Information, Royal Gardens, Kew 1925(10): 404–423. DOI: 10.2307/4115102
New taxa:
- Anoectochilus lylei Rolfe
- Anoectochilus multiflorus Rolfe
- Aphyllorchis caudata Rolfe
- Aphyllorchis unguiculata Rolfe
- Ascochilus loratus Rolfe ex Downie
- Cleisostoma siamense Rolfe
- Disperis siamensis Rolfe
- Galeola integra Rolfe
- Galeola kerrii Rolfe
- Galeola nana Rolfe
- Galeola siamensis Rolfe
- Gastrodia siamensis Rolfe
- Habenaria amplexicaulis Rolfe
- Habenaria aurantiaca Rolfe
- Habenaria garrettii Rolfe
- Habenaria humistrata Rolfe
- Habenaria recurva Rolfe
- Habenaria sutepensis Rolfe
- Habenaria trichochila Rolfe
- Leucolena siamensis Rolfe
- Odontochilus repens Rolfe
- Platanthera lacei Rolfe
- Sarcanthus carinatus Rolfe
- Sarcanthus recurvus Rolfe
- Sarcanthus siamensis Rolfe
- Vanilla siamensis Rolfe
- Zeuxine sutepensis Rolfe
- Zeuxine vittata Rolfe