| 1 |
Leaves deciduous in dry season; inflorescence (including rachis, bracts, and flowers) densely villous; column with a distinct column foot; lip adnate to column foot. |
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51 C. labrosa |
| + |
Leaves not deciduous; inflorescence glabrous or puberulent; column without a column foot; lip adnate to column wings or adnate to base of column |
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(2) |
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| 2 (1) |
Floral bracts caducous; rostellum unlobed |
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(3) |
| + |
Floral bracts persistent; rostellum 2- or 3-lobed |
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(8) |
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| 3 (2) |
Lip similar to petals, spurless. |
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1 C. actinomorpha |
| + |
Lip different from petals, spurred at base |
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(4) |
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| 4 (3) |
Flowers white. |
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2 C. angustifolia |
| + |
Flowers yellow |
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(5) |
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| 5 (4) |
Lip obscurely 3-lobed; lateral lobes very small, to 1 mm, sometimes inconspicuous. |
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3 C. lyroglossa |
| + |
Lip distinctly 3-lobed; lateral lobes relatively large, 2-5 mm |
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(6) |
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| 6 (5) |
Spur cylindric; lip adnate to base of column wings; column slender, ca. 12 mm. |
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4 C. densiflora |
| + |
Spur clavate; lip adnate to entire length of column wings; column thick, 5-7 mm |
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(7) |
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| 7 (6) |
Leaves narrowly elliptic; lip with 2 triangular lamellae at base of disk. |
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5 C. clavata |
| + |
Leaves oblong-elliptic to oblanceolate; lip with 2 lunar calli between lateral lobes of disk. |
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6 C. speciosa |
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| 8 (2) |
Lip spurless |
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(9) |
| + |
Lip spurred |
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(14) |
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| 9 (8) |
Flowers small; sepals to 7 mm. |
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7 C. tsoongiana |
| + |
Flowers large; sepals 10-20 mm |
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(10) |
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| 10 (9) |
Lip clawed at base, claw forming a shallow sac at base. |
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8 C. sacculata |
| + |
Lip not clawed |
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(11) |
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| 11 (10) |
Lip with 3-5 crested lamellae on disk. |
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9 C. tricarinata |
| + |
Lip without lamellae or calli on disk |
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(12) |
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| 12 (11) |
Flowers pale yellow. |
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10 C. ecarinata |
| + |
Flowers pink or pale purplish pink |
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(13) |
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| 13 (12) |
Sepals and petals not reflexed. |
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11 C. puberula |
| + |
Sepals and petals strongly reflexed. |
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12 C. reflexa |
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| 14 (8) |
Lip unlobed |
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(15) |
| + |
Lip 2- or 3-lobed |
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(19) |
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| 15 (14) |
Lip margin fimbriate. |
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13 C. alpina |
| + |
Lip margin entire, undulate, erose, or emarginate, but not fimbriate |
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(16) |
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| 16 (15) |
Floral bracts and sepals reflexed. |
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14 C. whiteana |
| + |
Floral bracts and sepals not reflexed |
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(17) |
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| 17 (16) |
Leaves 4 or 5, narrowly oblong, 1.5-2.6 cm wide. |
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15 C. fargesii |
| + |
Leaves 2 or 3, oblong or oblanceolate, 4-8 cm wide |
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(18) |
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| 18 (17) |
Flowers yellowish green; lip reniform; spur 11-14 mm. |
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16 C. simplex |
| + |
Flowers white, tinged purple; lip elliptic; spur ca. 28 mm. |
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17 C. petelotiana |
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| 19 (14) |
Lip 2-lobed. |
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18 C. biloba |
| + |
Lip 3-lobed |
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(20) |
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| 20 (19) |
Lip adorned with wartlike calli on disk |
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(21) |
| + |
Lip adorned with ridges or lamellae, or without any appendages on disk |
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(30) |
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| 21 (20) |
Mid-lobe of lip entire or shallowly emarginate, mucronate at apex or not |
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(22) |
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Mid-lobe of lip divided by a deep sinus into 2 lobules |
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(24) |
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| 22 (21) |
Flowers yellow-green; spur ca. 5.5 mm. |
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19 C. dulongensis |
| + |
Flowers pinkish purple or purple-red; spur 25-50 mm |
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(23) |
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| 23 (22) |
Leaves densely pubescent on both surfaces; pedicel and ovary ca. 20 mm; lip 8-9 mm. |
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20 C. sinica |
| + |
Leaves sparsely pubescent abaxially; pedicel and ovary ca. 35 mm; lip 11-17 mm. |
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21 C. sylvatica |
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| 24 (21) |
Scape arising from previous year’s leafless pseudobulb. |
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23 C. odora |
| + |
Scape arising from leaf axil of current year’s growth |
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(25) |
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| 25 (24) |
Spur 2-3 mm. |
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22 C. ×dominyi |
| + |
Spur 5-30 mm |
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(26) |
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| 26 (25) |
Leaves ensiform or lorate, 0.8-2(-5) cm wide; floral bracts reflexed; dorsal sepal to 9 mm. |
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24 C. davidii |
| + |
Leaves elliptic, elliptic-lanceolate, ovate-elliptic, or ovate-lanceolate, 4-12 cm wide; floral bracts not reflexed; dorsal sepal 10-15 mm |
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(27) |
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| 27 (26) |
Flowers yellowish green; lateral lobes of lip ovate or flabellate, 5-7 mm wide |
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(28) |
| + |
Flowers white, sometimes tinged purplish violet, or occasionally purplish red; lateral lobes of lip linear, oblong, or narrowly obovate-cuneate, 2-3 mm wide |
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(29) |
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| 28 (27) |
Leaves uniformly green, without silver-gray bands on adaxial surface; spur longer than 20 mm. |
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25 C. herbacea |
| + |
Leaves with several silver-gray bands on adaxial surface; spur less than 20 mm. |
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26 C. argenteostriata |
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| 29 (27) |
Pedicel and ovary 10-20 mm; lobules of lip mid-lobe subrhombic, 5-6 mm wide. |
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27 C. alismatifolia |
| + |
Pedicel and ovary 30-40 mm; lobules of lip mid-lobe linear-oblong, ca. 3 mm wide. |
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28 C. triplicata |
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| 30 (20) |
Lip without any appendages on disk |
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(31) |
| + |
Lip adorned with ridges or lamellae on disk (sometimes inconspicuous in C. arisanensis and C. plantaginea) |
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(32) |
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| 31 (30) |
Mid-lobe of lip obovate, ca. 8 mm wide. |
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29 C. yuana |
| + |
Mid-lobe of lip oblong-ligulate, ca. 2 mm wide. |
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30 C. limprichtii |
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| 32 (30) |
Ovary and capsule with 6 longitudinal winglike ridges. |
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46 C. arisanensis |
| + |
Ovary and capsule without longitudinal ridges |
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(33) |
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| 33 (32) |
Ridges on lip connecting to column wings |
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(34) |
| + |
Ridges and lamellae on lip free from column wings |
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(37) |
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| 34 (33) |
Lip with 3-5(-7) ridges on disk; spur 20-32 mm. |
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45 C. aristulifera |
| + |
Lip with 3 ridges on disk; spur 5-20 mm |
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(35) |
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| 35 (34) |
Lip with 4 brown marks on disk; sepals 12-13 mm. |
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43 C. graciliflora |
| + |
Lip lacking brown marks on disk; sepals 15-17 mm |
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(36) |
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| 36 (35) |
Ridges on disk of lip inconspicuous; lip mid-lobe as broad as or broader than long. |
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42 C. plantaginea |
| + |
Ridges on disk of lip tall and conspicuous, running onto mid-lobe; lip mid-lobe much longer than broad. |
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44 C. henryi |
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| 37 (33) |
Lateral lobes of lip distinctly broader than mid-lobe |
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(38) |
| + |
Lateral lobes of lip narrower than mid-lobe |
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(40) |
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| 38 (37) |
Petiole-like leaf base 30-37 cm; lip ca. 5.5 mm. |
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39 C. trifida |
| + |
Petiole-like leaf base 3-9 cm; lip 10-13 mm |
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(39) |
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| 39 (38) |
Spur much shorter than pedicel and ovary, 5-10 mm; lip mid-lobe emarginate. |
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40 C. discolor |
| + |
Spur longer than pedicel and ovary, 20 mm or more; lip mid-lobe shortly apiculate. |
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41 C. alleizettei |
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| 40 (37) |
Spur 8-15 mm |
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(41) |
| + |
Spur to 6 mm |
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(44) |
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| 41 (40) |
Flowers bright yellow; lip with 5 ridges on disk. |
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50 C. sieboldii |
| + |
Flowers white, pink, or pale red; lip with 3 lamellae or ridges on disk |
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(42) |
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| 42 (41) |
Margins of lip mid-lobe fimbriate. |
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47 C. metoensis |
| + |
Margins of lip mid-lobe slightly erose or emarginate, but not fimbriate |
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(43) |
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| 43 (42) |
Leaf solitary; flowers pale red; lip mid-lobe broadly ovate-cuneate, ca. 10 × 10 mm. |
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48 C. lechangensis |
| + |
Leaves 2; flowers white; lip mid-lobe obovate, ca. 7 × 8 mm. |
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49 C. nankunensis |
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| 44 (40) |
Dorsal sepal 7-9 mm. |
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31 C. mannii |
| + |
Dorsal sepal 12-35 mm |
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(45) |
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| 45 (44) |
Leaves 0.7-3.5 cm wide |
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(46) |
| + |
Leaves 5-12 cm wide |
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(48) |
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| 46 (45) |
Flowers with purplish red striations; lip with 7 crested lamellae on disk. |
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36 C. emeishanica |
| + |
Flowers without striations; lip with 3-5 ridges or lamellae |
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(47) |
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| 47 (46) |
Mid-lobe of lip elliptic-rhombic, 8-10 × 6-7 mm, apex aristate. |
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37 C. arcuata |
| + |
Mid-lobe of lip suboblong, ca. 6 × 4.5 mm, apex acute. |
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38 C. nipponica |
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| 48 (45) |
Lip with a single lamella on mid-lobe. |
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35 C. griffithii |
| + |
Lip with 3 lamellae on mid-lobe |
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(49) |
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| 49 (48) |
Lateral lobes of lip broader than long; spur adnate to ovary, 4.5-6 mm; lip disk lamellae taller than long. |
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34 C. fugongensis |
| + |
Lateral lobes of lip longer than broad; spur free from ovary, 2-3 mm; lip disk lamellae longer than tall |
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(50) |
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| 50 (49) |
Sepals and petals buff colored, with pinkish red striations; lip 6-10 mm wide. |
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32 C. brevicornu |
| + |
Sepals and petals yellow; lip 14-15 mm wide. |
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33 C. hancockii |
