Volume 79, 1951
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Key to the Species
| 1. | Midlobe absent, lateral lobes primary | 2 |
| Midlobe present, lateral lobes secondary | 3 | |
| 2. | Lobes simple, without appendages | 4 |
| Lobes fimbriate | pulchella | |
| 4. | Lobes very large, oblong-falcate, fleshy (leaf expanded at the base then abruptly constricted) | matthewsii |
| Lobes acuminate, spirally involute, erect, entire | 5 | |
| Lobes acuminate, hardly involute, recumbent, bifid | venosa cyanea | |
| 5. | Lobes shorter than the anther, labellum sepaloid | venosa cedricsmithii |
| Lobes higher than the anther, labellum crenulate and repand | venosa typica |
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| 3. | Midlobe crested, secondary lobes without cilia (stem flexuose, leaf terete, flowers creamy-red) | carnea imberbis |
| Midlobe crested, secondary lobes with cilia | 6 | |
| Midlobe not crested, secondary lobes usually with cilia | 7 | |
| 6. | Crest of tall calli (sepals spotted with brown) | ixioides |
| Crest denticulate (sepals not spotted) raceme in the bud resembling an ear of wheat | aemula | |
| 7. | Midlobe erect, shorter than the anther, secondary cilia white (flowers pink) | longifolia intermedia |
| Midlobe erect, higher than the anther, secondary cilia yellow | 8 | |
| Midlobe cucullate, secondary cilia where present, white | 9 | |
| 8. | Midlobe apiculate, dark brown | caesia |
| Midlobe emarginate, pinkish-yellow | pachyphylla | |
| Midlobe sinuate, black (with small darker tubercles just below the top, sepals spotted with brown) | decora | |
| 9. | Midlobe truncate or emarginate | 10 |
| Midlobe deeply bifid, yellow, secondary lobes with cilia | pauciflora | |
| Midlobe deeply bifid, green, secondary lobes without cilia | sanscilia | |
| 10. | Tip of midlobe faced with yellow or white | 11 |
| Tip of midlobe dark all over | aristata | |
| 11. | Secondary cilia very dense, short | longifolia forsteri |
| Secondary cilia rather lax, long | longifolia stenopetala |