Coelogyne, Lindley

Vo, Doan Trung, Averyanov, Leonid V., Maisak, Tatiana V., Bui, Van Huong, Nguyen, Van Canh, Dang, Minh Quan, Nguyen, Quoc Bao & Truong, Ba Vuong, 2022, New species, Coelogyne sondangii (Orchidaceae), and a new national record, C. moi, in Vietnam, Phytotaxa 559 (2), pp. 200-206 : 201

Key to the Coelogyne species formerly classified under Panisea in Vietnam

1. Lip with side-lobes or auricles ...........................................................................................................................................................2

–. Lip entire ............................................................................................................................................................................................5

2. Lip with keels .....................................................................................................................................................................................3

–. Lip without keels ................................................................................................................................................................................4

3. Inflorescence 1-flowered; lip with 3 low straight keels; lip side lobes falcate, epichile margin more or less flat............ C. uniflora

–. Inflorescence normally few-flowered; lip with 2 fat undulate keels; lip side lobes broadly triangular, epichile margin undulate ..... ............................................................................................................................................................................................... C. vinhii

4. Sepals less than 2 cm long; the margin of lip and column wings at apex entire ............................................................... C. sagittata

–. Sepals longer than 2 cm; the margin of lip lobes erose-irregular denticulate, column wings at apex irregularly denticulate............. ......................................................................................................................................................................................... C. sondangii

5. Lip with calli or keels .........................................................................................................................................................................6

–. Lip without ornamentation .................................................................................................................................................................9

6. Lip with 3 calli, flowers yellowish-green to pale yellow-orange.......................................................................................................7

–. Lip with 2 keels, flowers white ..........................................................................................................................................................8

7. Leaves elliptic to elliptic-ovate ........................................................................................................................................ C. tricallosa

–. Leaves lanceolate to narrowly lanceolate........................................................................................................................... C. garrettii

8. Lip white, with brown-yellow blotch at middle; keels undulate, run from middle of hypochile to central part of epichile ............... ................................................................................................................................................................................................... C. moi

–. Lip uniformly white; keels straight, running from base of hypochile to base of epichile................................................. C. albiflora

9. Inflorescence with 1–2 flowers; flower purely white, sepals without keel, lateral sepals without saccate base; margin of petals entire........................................................................................................................................................................... C. yunnanensis

–. Inflorescence normally with up to 6 flowers; flower white with brown marks on base of lip and column, sepals keeled abaxially, lateral sepals at base obscurely saccate .............................................................................................................................. C. demissa