Dendrobium niveolabium (Orchidaceae, section Grastidium), a new Dendrobiinae species from Papua, Indonesia Author Naive, Mark Arcebal K. Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China. & University of Chinese Academy of Sciences, Beijing 100049, China. Author Handoyo, Frankie Kemang Golf 2 DC- 5, Kemang, Pratama Bekasi 17116, West Java, Indonesia. Author Ormerod, Paul 7 P. O. Box 8210, Cairns, Qld., 4870, Australia. Author Champion, Jeffrey Omahku di Awan, Jl. Raya Candi Kuning, Candi Kuning 2, Bedugul, Tabanan, Bali, Indonesia. text Phytotaxa 2021 2021-03-16 490 3 271 277 http://dx.doi.org/10.11646/phytotaxa.490.3.5 journal article 10.11646/phytotaxa.490.3.5 1179-3163 5754280 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