Dendrobium niveolabium, Handoyo, Naive, Ormerod & J. Champ. A. Flower, 2021

Naive, Mark Arcebal K., Handoyo, Frankie, Ormerod, Paul & Champion, Jeffrey, 2021, Dendrobium niveolabium (Orchidaceae, section Grastidium), a new Dendrobiinae species from Papua, Indonesia, Phytotaxa 490 (3), pp. 271-277 : 276

Key to Dendrobium niveolabium and its allied species

1. Leaves less than 4 cm long, basally twisted so that the upper surfaces lie in an almost flat plane.................................................... 2

- Leaves 5–13 cm long, not basally twisted or lying in an almost flat plane........................................................................................ 3

2. Lip with midkeel forming a flap-like lamella on the hypochile; midlobe transversely elliptic .............................. D. patentissimum

- Lip with midkeel forming a low lamellate ridge on the hypochile; midlobe cuneate, apex with a retrorse barb ................................ ............................................................................................................................................................................................ D. igneum

3. Lip with midlobe suborbicular to suborbicular-hexangulate.............................................................................................................. 4

- Lip with midlobe obovate-obcordate.................................................................................................................................................. 5

4. Leaves linear-lanceolate, 0.95–1.5 cm wide; lip with midkeel crispate-undulate on hypochile; midlobe apiculate, broadly crossed by 6–8 transverse ridges .......................................................................................................................................... D. hollandianum

- Leaves oblong-lanceolate to lanceolate, 1.25–3.20 cm wide. Lip with midkeel straight on hypochile, its upper surface with regular shallow notches; midlobe subacute, each side of midline with short transverse, low ridges...................................... D. papyraceum

5. Leaves 10–13 cm long by 3–5 cm wide; flowers pale yellow, lip red margined with black-red sidelobes; dorsal sepal 15 mm long; lip 9 mm long, midlobe 5.5–6.0 mm wide ................................................................................................................. D. ochranthum

- Leaves to 7 cm long by 1.5 cm wide; flowers pale yellow, lip pure white; dorsal sepal 12 mm long; lip 13 mm long, midlobe 8–9 mm wide ..................................................................................................................................................................... D. niveolabium