1 |
Rhizome elongate, to 7 cm or more, leafy stems arising at intervals of 2-25 mm along rhizome |
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(2) |
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Rhizome abbreviated |
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(4) |
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2 (1) |
Leaves not articulate at base; petals linear, slightly falcate; leaves 10-25 × 3-8 mm; stems arising at intervals of 5-25 mm along rhizome. |
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1 O. pumila |
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Leaves articulate to basal sheath; petals, leaves, and stems without above combination of characters |
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(3) |
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3 (2) |
Leaves 4-7 mm wide; flowers greenish, sometimes tinged purple; lateral lobes of lip obscurely erose-denticulate. |
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2 O. seidenfadenii |
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Leaves 1.5-2 mm wide; flowers pale yellowish brown; margins of lip irregularly serrate. |
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3 O. sinica |
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4 (1) |
Leaves not articulate at base |
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(5) |
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Leaves articulate at base |
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(17) |
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5 (4) |
Peduncle connate in lower part to uppermost leaf, appearing to arise from leaf blade. |
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15 O. obcordata |
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Scape not connate in lower part to uppermost leaf |
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(6) |
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6 (5) |
Mid-lobe of lip bilobed, with sinus more than 1/5 length of lip; lobules acuminate to long acuminate at apex |
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(7) |
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Mid-lobe of lip entire or shallowly lobed at apex, with sinus less than 1/6 length of lip; lobules obtuse at apex |
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(11) |
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7 (6) |
Stem very short or inconspicuous; leaves nearly basal; flowers red; lip with a callus near base |
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(8) |
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Stem 1.5-7 cm; leaves cauline, distichous; flowers green to orange-yellow, sometimes pale red; lip without callus |
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(9) |
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8 (7) |
Lateral lobes of lip orbicular; peduncle bracts lanceolate. |
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14 O. recurva |
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Lateral lobes of lip filiform; peduncle bracts filiform. |
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13 O. rufilabris |
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9 (7) |
Lateral lobes of lip ± erose or erose-fimbriate on margin. |
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16 O. arisanensis |
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Lateral lobes of lip entire |
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(10) |
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10 (9) |
Leaves 1-2(-3) mm wide; flowers greenish yellow or pale yellow; petals slightly longer than sepals. |
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11 O. mannii |
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Leaves 3-5 mm wide; flowers pale red; petals and sepals equal in length. |
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12 O. anthropophora |
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11 (6) |
Floral bracts 4-5 mm, more than 3 × as long as pedicel and ovary. |
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8 O. longibracteata |
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Floral bracts 1-2 mm, less than 3 × as long as pedicel and ovary |
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(12) |
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12 (11) |
Petals conspicuously erose at margin; lateral lobes of lip slightly smaller than mid-lobe. |
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7 O. rosea |
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Petals entire or inconspicuously erose at margin |
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(13) |
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13 (12) |
Lateral lobes of lip ca. as large as or slightly larger than mid-lobe, margins erose, irregularly laciniate, or fimbriate. |
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6 O. jenkinsiana |
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Lateral lobes of lip conspicuously smaller than mid-lobe, margins entire or inconspicuously erose |
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(14) |
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14 (13) |
Sepals broader than petals |
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(15) |
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Sepals and petals equal in width |
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(16) |
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15 (14) |
Stem conspicuous, 1-2 cm; leaf blade 1-2(-3) cm; pedicel and ovary nearly as long as or slightly longer than floral bracts. |
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4 O. japonica |
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Stem inconspicuous; leaf blade 2.5-7 cm; pedicel and ovary shorter than floral bracts. |
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5 O. variabilis |
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16 (14) |
Mid-lobe of lip obtuse at apex; lateral lobes subovate or ovate-oblong; petals inconspicuously erose at margin. |
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10 O. menghaiensis |
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Mid-lobe of lip emarginate at apex; lateral lobes nearly narrowly ovate-lanceolate; petals entire. |
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9 O. delicata |
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17 (4) |
Leaves subterete. |
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33 O. cavaleriei |
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Leaves laterally compressed |
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(18) |
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18 (17) |
Leaves 20-50 × 1.2-2.2 cm; lip with a callus at either side of sinus. |
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32 O. ensiformis |
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Leaves commonly 1-20 cm; lip ecallose |
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(19) |
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19 (18) |
Peduncle foliaceous below, ± connate to uppermost leaf; lip entire. |
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31 O. pachyrachis |
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Peduncle cylindric or compressed cylindric, never connate to leaves |
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(20) |
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20 (19) |
Petals conspicuously larger than lip, to 2 mm wide. |
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29 O. latipetala |
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Petals smaller than or nearly as large as lip, less than 1 mm wide |
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(21) |
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21 (20) |
Lip entire, nearly oblate. |
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30 O. integerrima |
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Lip ± 3-lobed, never oblate |
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(22) |
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22 (21) |
Floral bracts with a long apical awn. |
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19 O. falconeri |
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Floral bracts without a long apical awn |
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(23) |
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23 (22) |
Scape with narrow wings on both sides, including wings 4-5 mm wide; leaves 1-2.1 cm wide |
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(24) |
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Scape wingless or nearly so, 2-3 mm in diam.; leaves 2-10 mm wide (excluding O. gigantea) |
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(28) |
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24 (23) |
Lip nearly entire, retuse, margin irregularly laciniate. |
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22 O. segawae |
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Lip 3-lobed, apex entire or lobed |
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(25) |
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25 (24) |
Mid-lobe of lip unlobed at apex. |
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27 O. menglaensis |
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Mid-lobe of lip 2-lobed at apex |
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(26) |
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26 (25) |
Petals entire. |
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21 O. gigantea |
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Petals with erose-toothed margins |
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(27) |
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27 (26) |
Raceme densely flowered, with several hundred flowers borne less than 1 mm apart from each other. |
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25 O. mucronata |
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Raceme laxly flowered, flowers to 100, sometimes more, borne up to 3 mm apart from each other. |
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26 O. gammiei |
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28 (23) |
Lateral lobes of lip fimbriate at margin. |
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28 O. austroyunnanensis |
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Lateral lobes of lip never fimbriate at margin |
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(29) |
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29 (28) |
Lobules of mid-lobe of lip subquadrate or broadly oblong, equal in width and length, erose at margin |
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(30) |
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Lobules of mid-lobe of lip oblong or triangular to lanceolate, longer than wide, nearly entire |
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(31) |
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30 (29) |
Leaves ca. 13 cm; flowers whorled; lateral lobes of lip very small or inconspicuous. |
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23 O. kwangsiensis |
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Leaves 1-3.5 cm; flowers scattered; lateral lobes of lip conspicuous. |
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24 O. cathayana |
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31 (29) |
Leaves 1.5-6(-8) × 0.2-0.7 cm; raceme 2-8 cm; lateral lobes of lip conspicuous |
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(32) |
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Leaves (4.5-)8-20 × 0.7-1.5 cm; raceme more than 10 cm; lateral lobes of lip inconspicuous |
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(33) |
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32 (31) |
Stem conspicuous, longer than leaves; leaves 2-4 mm wide. |
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17 O. caulescens |
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Stem often inconspicuous, shorter than leaves when present; leaves (3-)4-7 mm wide. |
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18 O. pyrulifera |
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33 (31) |
Flowers greenish white; mid-lobe of lip with suboblong lobules; leaves 7-10 mm wide, veins conspicuous when dried. |
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20 O. acaulis |
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Flowers orange; mid-lobe of lip with triangular lobules; leaves 8-15 mm wide, veins inconspicuous when dried. |
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21 O. gigantea |