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| 1 |
Inflorescence with imbricate sterile bracts |
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(2) |
| + |
Inflorescence bare to first flower, or rarely with 1 or a few sterile bracts; flowers opening simultaneously |
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(18) |
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| 2 (1) |
Inflorescence with imbricate sterile bracts mainly at base of peduncle; lip with 3 lamellae, margin of mid-lobe fimbriate |
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(3) |
| + |
Inflorescence with imbricate sterile bracts at junction of peduncle and rachis |
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(5) |
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| 3 (2) |
Petals ovate-lanceolate, nearly as wide as sepals, lip not 3-lobed. |
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1 C. leungiana |
| + |
Petals filiform to linear, much narrower than sepals, lip 3-lobed |
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(4) |
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| 4 (3) |
Lip mid-lobe ovate, callus with 3 lamellae, median lamella indistinct, lateral lamellae terminating near tip of mid-lobe, undulate. |
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2 C. ovalis |
| + |
Lip mid-lobe orbicular, fimbriate, callus with 3 lamellae, median lamella virtually a brown vein, lateral lamellae terminating at tip of mid-lobe, initially diverging then converging at tip of mid-lobe. |
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3 C. fimbriata |
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| 5 (2) |
Rachis extending with new imbricate bracts to produce further annual sets of flowers |
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(6) |
| + |
Rachis producing single set of flowers |
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(10) |
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| 6 (5) |
Pseudobulbs cylindric or narrowly ovoid |
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(7) |
| + |
Pseudobulbs ovoid or ellipsoid |
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(8) |
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| 7 (6) |
Lip mid-lobe oblong-obcordate, 3-4 mm, callus with 3 lamellae, median lamella short, lateral lamellae parallel, extending from base of lip to 2/3 onto mid-lobe, low initially, then rising, abruptly terminating. |
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4 C. raizadae |
| + |
Lip mid-lobe broadly oblong or subelliptic, ca. 6 mm, callus with 2 narrow longitudinal lamellae extending from base of lip to near middle of mid-lobe, prominent on mid-lobe only. |
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5 C. longipes |
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| 8 (6) |
Lip with no callus; flowers red with a partly black apex to mid-lobe. |
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6 C. tsii |
| + |
Lip with a callus with 2 lamellae |
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(9) |
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| 9 (8) |
Lip mid-lobe nearly broadly oblong, 2 lamellae faint near base of lip, elevated and prominent on mid-lobe. |
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7 C. schultesii |
| + |
Lip mid-lobe nearly elliptic, 2 lamellae terminating 2/3 onto mid-lobe. |
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8 C. prolifera |
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| 10 (5) |
Lip with 5 lamellae |
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(11) |
| + |
Lip with 2 or 3 lamellae |
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(12) |
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| 11 (10) |
Lip with prominent lamellae, outer lamellae broader. |
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9 C. griffithii |
| + |
Lip with median keel fleshy on mid-lobe. |
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10 C. zhenkangensis |
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| 12 (10) |
Dorsal sepal more than 1.5 cm |
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(13) |
| + |
Dorsal sepal less than 1.5 cm |
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(15) |
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| 13 (12) |
Lip with crenulate lamellae, mid-lobe suborbicular or cordate, margin erose, 2 crenulate lamellae terminating at base of mid-lobe. |
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11 C. stricta |
| + |
Lip with fimbriate lamellae |
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(14) |
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| 14 (13) |
Dorsal sepal ca. 4 cm; lip mid-lobe triangular with fimbriate margin and 3 fimbriate lamellae terminating at tip of mid-lobe. |
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12 C. barbata |
| + |
Dorsal sepal nearly 3 cm; lip mid-lobe quadrangular with fimbriate margin and 2 fimbriate lamellae terminating at middle of mid-lobe, lamellae becoming a warty projection toward tip. |
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13 C. calcicola |
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| 15 (12) |
Pseudobulbs less than 4 cm; lip mid-lobe nearly orbicular, bilobed, with 3 simple, straight lamellae; flowers white with some yellow. |
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14 C. leucantha |
| + |
Pseudobulbs more than 5 cm |
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(16) |
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| 16 (15) |
Inflorescence slender and arching; lip mid-lobe suborbicular, 3 crenulate or fimbriate lamellae terminating at base of mid-lobe, median keel shorter. |
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15 C. rigida |
| + |
Inflorescence erect; lip with fimbriate or crenulate lamellae |
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(17) |
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| 17 (16) |
Lip with 3 crenulate and fleshy lamellae terminating at base of mid-lobe, median keel shorter. |
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16 C. pulchella |
| + |
Lip with 3 fimbriate lamellae. |
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17 C. sanderae |
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| 18 (1) |
Pseudobulb with 1 leaf; flowers fleshy; lip ± entire without distinct lateral lobes, and 3 smooth lamellae. |
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18 C. malipoensis |
| + |
Pseudobulbs with 2 leaves; flowers membranous; lip with distinct lateral lobes, basal part not embracing column, lip lacking transverse fold at base |
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(19) |
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| 19 (18) |
Inflorescence heteranthous; lip mid-lobe suborbicular, callus with 4 or 5 fimbriate lamellae. |
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19 C. cristata |
| + |
Sepals, petals, and lip margins not undulate; lamellae not fimbriate, deeply serrate, deeply crenulate, or laciniate but entire or erose, papillate or verrucose, dentate or crenulate to irregularly cristate |
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(20) |
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| 20 (19) |
Dorsal sepal forming a hood over column, larger than lateral sepals and petals; lateral sepals and petals not widespread away from column |
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(21) |
| + |
Dorsal sepal erect, away from column; lateral sepals and petals widespread away from column; sepals and petals of ca. equal length |
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(22) |
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| 21 (20) |
Lip with mid-lobe orbicular, callus with 3 lamellae, but median lamella shorter. |
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20 C. assamica |
| + |
Lip with lateral lobes rounded in front, mid-lobe broadly ovate to cordate, callus with 3 fleshy, undulate lamellae. |
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21 C. fuscescens |
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| 22 (20) |
Dorsal sepal and lateral sepals of ca. equal width, petals narrower |
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(23) |
| + |
Dorsal sepal, lateral sepals, and petals of ca. equal width; sepals, petals, and lip tending toward being fleshy |
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(26) |
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| 23 (22) |
Lip with mid-lobe large in relation to overall size of flower, sometimes clawed; lip with margin tending toward being membranous |
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(24) |
| + |
Lip with mid-lobe not large relative to overall size of flower; lip without evident claw; lip with margin tending toward being fleshy |
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(25) |
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| 24 (23) |
Lip mid-lobe ovate, margin membranous, callus with 3 lamellae terminating at tip of mid-lobe, median keel ca. 1/2 as long. |
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22 C. taronensis |
| + |
Lip mid-lobe oblong-ovate, callus with 5 lamellae, 3 crenate lamellae terminating at base of mid-lobe, 2 further lamellae continue to tip of mid-lobe. |
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23 C. suaveolens |
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| 25 (23) |
Inflorescence heteranthous, with arching peduncle and rachis; lip mid-lobe ovate-lanceolate, crenate at sinuses, callus with 3 undulate lamellae terminating at base of mid-lobe. |
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24 C. flaccida |
| + |
Inflorescence proteranthous; lip mid-lobe initially with parallel sides then expanding, callus with 3 crenate lamellae terminating at ca. 1/3 way on mid-lobe. |
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25 C. viscosa |
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| 26 (22) |
Inflorescence hysteranthous |
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(27) |
| + |
Inflorescence proteranthous or synanthous |
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(28) |
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| 27 (26) |
Inflorescence peduncle enclosed with bracts to rachis, lower flowers concealed by bracts; lip with 3 lamellae, median keel short, lateral lamellae terminating on mid-lobe, crenate, thickened. |
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26 C. occultata |
| + |
Inflorescence bare; lip with 3 dentate lamellae converging toward base of mid-lobe then diverging and disappearing on mid-lobe, further dentate, curled lamellae appearing on outside of existing lamellae. |
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27 C. punctulata |
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| 28 (26) |
Inflorescence proteranthous |
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(29) |
| + |
Inflorescence synanthous |
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(30) |
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| 29 (28) |
Inflorescence 3-8-flowered; flowers white; lip with continuous golden yellow eyes on lateral lobes, 2 yellow patches bordered with red on mid-lobe, 3 lamellae terminating at base of mid-lobe. |
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28 C. nitida |
| + |
Inflorescence 2- or 3-flowered; flowers creamy yellow; lip with 3 white, crested lamellae terminating at middle of mid-lobe. |
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29 C. weixiensis |
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| 30 (28) |
Sepals lanceolate; petals narrowly lanceolate; flowers white, 4 large yellow eyes bordered with orange-red on lip; lip with 3 low lamellae terminating at base of mid-lobe, crenulate. |
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30 C. corymbosa |
| + |
Sepals subelliptic; petals subrhombic-elliptic; flowers cream-colored with brown veins on lateral lobes and deep yellow lamellae. |
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31 C. gongshanensis |
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