| 1 |
Leaves herbaceous or membranous, not articulate at base; plants usually terrestrial |
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(2) |
| + |
Leaves papery to thickly papery, articulate at base; plants usually epiphytic or lithophytic |
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(31) |
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| 2 (1) |
Leaf solitary |
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(3) |
| + |
Leaves 2 to many |
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(6) |
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| 3 (2) |
Floral bracts lanceolate, 5-9 mm |
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(4) |
| + |
Floral bracts triangular, 0.5-1 mm |
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(5) |
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| 4 (3) |
Leaf cordate; lip with 2 small basal calli; column strongly arcuate, base with 2 low oblong mounds. |
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28 L. petiolata |
| + |
Leaf oblong to oblong-elliptic; lip without calli; column weakly arcuate, base with 2 subglobose mounds. |
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4 L. glossula |
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| 5 (3) |
Leaves (3-)6-17 cm, cordate at base; raceme many flowered; lip broadly obovate, with 2 small calli. |
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1 L. cordifolia |
| + |
Leaves 1-2 cm, base not cordate; raceme 1- or 2-flowered; lip ovate-orbicular with 2 low ridges. |
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3 L. amabilis |
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| 6 (2) |
Plants with an elongate rhizome, pseudobulbs 2-5 cm or more apart |
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(7) |
| + |
Plants with an abbreviated rhizome, pseudobulbs sequentially close together |
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(8) |
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| 7 (6) |
Floral bracts 1.5-2.5 mm; lip apex usually broadly rounded, sometimes apiculate. |
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7 L. auriculata |
| + |
Floral bracts 5-6 mm; lip apex broadly triangular, acute. |
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28 L. petiolata |
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| 8 (6) |
Lip rectangular-cuneate, apex deeply erose to pectinate. |
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27 L. barbata |
| + |
Lip not as above, at most shallowly dentate |
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(9) |
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| 9 (8) |
Ovary with 6 prominent wavy wings. |
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24 L. regnieri |
| + |
Ovary wingless or with narrow straight wings |
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(10) |
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| 10 (9) |
Plants with stemlike pseudobulbs (2-)5-30 cm |
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(11) |
| + |
Plants with ovoid, globose, or fusiform pseudobulbs shorter than 3.5 cm |
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(15) |
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| 11 (10) |
Flowers greenish yellow; lip with a deep median channel flanked by lamellate callus ridges. |
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23 L. sootenzanensis |
| + |
Flowers greenish or greenish purple to black-purple; lip base with 2 calli lacking lamellate extensions |
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(12) |
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| 12 (11) |
Column with triangular wings, basal margins of wings forming an acute to right angle with axis of column. |
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20 L. formosana |
| + |
Column almost wingless or with narrow rounded wings |
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(13) |
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| 13 (12) |
Flowers dark purple throughout; dorsal sepal 18-20 mm. |
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21 L. gigantea |
| + |
Flowers greenish, tinged with purple, never dark purple throughout; dorsal sepal shorter than 16 mm |
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(14) |
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| 14 (13) |
Dorsal sepal 10-15 mm; lip 9-15 mm; column 5-6 mm. |
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22 L. henryi |
| + |
Dorsal sepal 8-9 mm; lip 3.5-6.5 mm; column 3.5-4 mm. |
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19 L. nervosa |
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| 15 (10) |
Leaves 3-6, linear to linear-lanceolate |
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(16) |
| + |
Leaves 2 or 3, ligulate to cordate |
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(18) |
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| 16 (15) |
Petals 3-veined; lip papillose adaxially. |
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26 L. hensoaensis |
| + |
Petals 1-veined; lip not papillose adaxially |
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(17) |
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| 17 (16) |
Leaf blade 3-5 × as long as wide. |
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16 L. odorata |
| + |
Leaf blade 8-10 × as long as wide. |
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25 L. ferruginea |
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| 18 (15) |
Lip without a basal callus |
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(19) |
| + |
Lip with a basal callus or lamellae |
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(21) |
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| 19 (18) |
Column with 2 short teeth projecting from sides at base; lip elliptic-obovate to broadly obovate-obcordate. |
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13 L. rostrata |
| + |
Column without projecting basal teeth; lip cuneate to narrowly obovate |
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(20) |
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| 20 (19) |
Sepals 10-12 × 2.5-3.5 mm; lip 10-12 mm; column 5-6 mm. |
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5 L. elongata |
| + |
Sepals 5-9 × to 2 mm; lip 6-7 mm; column 2.5-3.5 mm. |
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6 L. campylostalix |
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| 21 (18) |
Floral bracts 4-15 mm |
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(22) |
| + |
Floral bracts 0.3-3 mm |
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(25) |
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| 22 (21) |
Lip elliptic, rounded; callus extending 2/3 medially along lip as a glossy dark green thickening. |
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14 L. tschangii |
| + |
Lip broadly obovate or with an emarginate, transversely elliptic blade; callus without a thickened extension |
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(23) |
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| 23 (22) |
Inflorescence with a dense pyramidal raceme; lip with a transversely elliptic, emarginate blade. |
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15 L. siamensis |
| + |
Inflorescence with a narrow, laxer raceme; lip blade broadly obovate to subquadrate |
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(24) |
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| 24 (23) |
Leaves 2, opposite, blades lying on ground, base subcordate, sessile; petals 1-veined; lip callus shallowly bilobed, lobules obtuse. |
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2 L. oppositifolia |
| + |
Leaves 2 or 3, suberect to erect, base cuneate, with elongate sheathing base; petals 3-veined; lip callus deeply bilobed, lobules acute. |
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16 L. odorata |
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| 25 (21) |
Lip with an ovate, acuminate blade |
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(26) |
| + |
Lip with blade suborbicular or elliptic to obovate, apex apiculate to emarginate |
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(27) |
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| 26 (25) |
Lip apparently with a lamellate basal callus, margin of blade entire or sparsely minutely ciliate. |
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12 L. krameri |
| + |
Lip with a large, convex, frontally excavate basal callus, margin of blade conspicuously white ciliate. |
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11 L. sasakii |
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| 27 (25) |
Inflorescence many flowered; lip broadly obovate to suborbicular |
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(28) |
| + |
Inflorescence 1-6-flowered; lip subquadrate, obovate-elliptic, or oblong-subpandurate |
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(29) |
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| 28 (27) |
Flowers blackish purple; callus restricted to base of lip, not forming a hollow. |
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10 L. dunnii |
| + |
Flowers green, base of column and most of lip purple; callus obscure, forming a basal hollow and from there a shallow groove extending onto blade flanked by low keels. |
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8 L. cathcartii |
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| 29 (27) |
Leaves 2.7-9 cm, with exposed or evident petioles; lip obovate-elliptic. |
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9 L. pauliana |
| + |
Leaves shorter than 2 cm, without exposed or evident petioles |
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(30) |
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| 30 (29) |
Lip subquadrate, ca. 8.5 × 7 mm; column ca. 4 mm. |
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18 L. brunnea |
| + |
Lip oblong-subpandurate, 5-7 × ca. 3 mm; column 2-2.5 mm. |
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17 L. pygmaea |
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| 31 (1) |
Pseudobulbs 1-leaved |
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(32) |
| + |
Pseudobulbs 2-5-leaved |
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(49) |
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| 32 (31) |
Lip strongly 3-lobed. |
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44 L. mannii |
| + |
Lip entire or apex bilobed |
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(33) |
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| 33 (32) |
Lip apex deeply bilobed, lobules minutely lobulate with ciliate-pubescent margins. |
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43 L. latifolia |
| + |
Lip apex acute to shallowly emarginate, without ciliate-pubescent margins |
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(34) |
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| 34 (33) |
Pseudobulbs prostrate or distinctly wider than long |
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(35) |
| + |
Pseudobulbs erect or ascending, ca. as wide as long to elongate |
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(37) |
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| 35 (34) |
Lip obovate, base with a fleshy bilobed callus. |
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40 L. chapaensis |
| + |
Lip cuneate-subpandurate, base with 2 separate low ridges |
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(36) |
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| 36 (35) |
Leaves subsessile; dorsal sepal connate to margins of lateral sepals for ca. 2/3 of length. |
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63 L. seidenfadeniana |
| + |
Leaves petiolate, petiole 3-12 mm; dorsal sepal free from lateral sepals. |
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42 L. fargesii |
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| 37 (34) |
Flowers very small, sepals 1.5-2.5 mm |
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(38) |
| + |
Flowers larger, sepals 3.5-11.5 mm |
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(39) |
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| 38 (37) |
Sepals 1.5-1.8 mm; lip with an indistinct basal callus; column 0.8-1.2 mm. |
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36 L. cespitosa |
| + |
Sepals ca. 2.5 mm; lip with separated calli on each side above base; column ca. 2 mm. |
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41 L. pumila |
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| 39 (37) |
Column apex unwinged or narrowly winged |
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(40) |
| + |
Column apex with triangular to hook-shaped wings |
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(42) |
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| 40 (39) |
Floral bracts ca. 3 mm; sepals 3.5-5.3 mm; lip apex bilobed to truncate-emarginate. |
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30 L. averyanoviana |
| + |
Floral bracts 5-10 mm; sepals 5-10 mm; lip apex truncate to shovel-shaped |
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(41) |
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| 41 (40) |
Sepals 8-10 mm; lip subpandurate, apex shovel-shaped, 4.7-6 mm wide. |
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35 L. esquirolii |
| + |
Sepals 5-6 mm; lip rectangular, apex truncate, 2.5-3 mm wide. |
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57 L. sparsiflora |
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| 42 (39) |
Lateral sepals connate to middle; lip without a callus; column with an additional pair of apical triangular wings. |
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38 L. inaperta |
| + |
Lateral sepals free; lip with a basal callus or a low medial thickening; column without additional apical wings |
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(43) |
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| 43 (42) |
Pseudobulbs 1.5-5 cm apart |
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(44) |
| + |
Pseudobulbs close together |
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(45) |
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| 44 (43) |
Leaves 9-11 × 1.6-1.8 cm; lip ca. 7.5 × 10 mm; calli confluent basally; column curved, ca. 4 mm. |
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32 L. bautingensis |
| + |
Leaves 8.3-11.5 × 3-4 cm; lip 10-11 × ca. 10 mm; calli separate, not confluent; column straight, 4.8-5 mm. |
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33 L. superposita |
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| 45 (43) |
Leaves 3.4-4 cm wide; lip callus divided into a pair of narrowly conic, acute lobes. |
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34 L. rockii |
| + |
Leaves 0.5-3.3 cm wide; lip callus not as above, sometimes with digitate extensions but these obtuse |
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(46) |
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| 46 (45) |
Lip ca. 2 mm wide |
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(47) |
| + |
Lip 3-13 mm wide |
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(48) |
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| 47 (46) |
Lip apex with irregular margins, basal half with a low medial thickening. |
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37 L. laurisilvatica |
| + |
Lip apex with entire margins, basal half with a quadrate, rarely indistinct callus. |
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39 L. kwangtungensis |
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| 48 (46) |
Sepals 5-8 mm; lip 5-7 × 4-5 mm, cuneate to cuneate-obovate; anther cap ca. 1 mm. |
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29 L. bootanensis |
| + |
Sepals 9-13 mm; lip 8-12 × 9-13 mm, suborbicular to broadly obovate; anther cap ca. 2 mm. |
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31 L. balansae |
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| 49 (31) |
Pseudobulbs (2 or)3-5-leaved |
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(50) |
| + |
Pseudobulbs 2-leaved |
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(54) |
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| 50 (49) |
Leaves linear, 1-2 mm wide. |
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58 L. perpusilla |
| + |
Leaves ligulate to oblong-lanceolate, 4-11 mm wide |
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(51) |
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| 51 (50) |
Column with a single pair of broad wings, each with a retrorse thread; lip apex shortly calceolate. |
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62 L. resupinata |
| + |
Column with 2 pairs of wings; lip apex not calceolate |
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(52) |
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| 52 (51) |
Lip with a complicate callus, appearing to be in 2 bilobed parts. |
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60 L. platyrachis |
| + |
Lip callus simpler, U-shaped or frontally excavate |
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(53) |
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| 53 (52) |
Sepals 2.5-3.5 mm; lip blade transversely elliptic-suborbicular. |
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59 L. delicatula |
| + |
Sepals 4.5-5.8 mm; lip blade cuneate-obovate. |
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61 L. assamica |
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| 54 (49) |
Lip blade broadly obovate. |
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48 L. distans |
| + |
Lip not as above |
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(55) |
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| 55 (54) |
Pseudobulbs cylindric to narrowly conic-cylindric, longer than 5 cm |
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(56) |
| + |
Pseudobulbs globose to ovoid, shorter than 5 cm |
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(58) |
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| 56 (55) |
Pseudobulbs well spaced on a slender rhizome, 2-4 cm apart; lip margins minutely pubescent-ciliate. |
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46 L. condylobulbon |
| + |
Pseudobulbs clustered, on a short rhizome; lip margins glabrous |
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(57) |
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| 57 (56) |
Sepals 2-3.5 mm; lip without a callus. |
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45 L. viridiflora |
| + |
Sepals 5-6 mm; lip with a bifurcate basal callus. |
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47 L. bistriata |
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| 58 (55) |
Lip apex deeply bilobed |
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(59) |
| + |
Lip apex not as above |
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(60) |
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| 59 (58) |
Leaf apex obtuse; scape without peduncular bracts below middle; lip with 2 divergent ridges in basal 1/4. |
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54 L. grossa |
| + |
Leaf apex acute; scape with several peduncular bracts below middle; lip with 2 longitudinal lamellae from base to middle. |
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55 L. fissilabris |
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| 60 (58) |
Pseudobulbs compressed globose; lip ovate-elliptic, apex subacuminate, lacking a basal callus. |
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52 L. elliptica |
| + |
Pseudobulbs globose to ovoid; lip not as above, usually with some form of callus or thickening |
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(61) |
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| 61 (60) |
Lip with a medial longitudinal ridge with a bilobed or sulcate basal callus |
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(62) |
| + |
Lip without a longitudinal ridge but either a bilobed callus or an obscure quadrate thickening |
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(63) |
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| 62 (61) |
Lip transversely elliptic-suborbicular, 8-10 mm wide, basal callus bilobed and disjunct from medial ridge. |
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51 L. latilabris |
| + |
Lip cuneate, ca. 3 mm wide, basal callus sulcate and continuous with a short ridge. |
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56 L. luteola |
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| 63 (61) |
Sepals (5.5-)7-12 mm; lip cuneate to subpandurate. |
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49 L. nakaharae |
| + |
Sepals 1.5-6 mm; lip not as above |
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(64) |
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| 64 (63) |
Leaves 1.2-4.5 cm; lip transversely elliptic-suborbicular; column with 2 pairs of wings. |
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59 L. delicatula |
| + |
Leaves 4-46 cm; lip ovate-oblong, rectangular to broadly obdeltate; column with 1 pair of wings |
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(65) |
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| 65 (64) |
Inflorescence 4-8-flowered; lip rectangular. |
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57 L. sparsiflora |
| + |
Inflorescence many flowered; lip not as above |
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(66) |
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| 66 (65) |
Lip broadly obdeltate. |
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50 L. stricklandiana |
| + |
Lip ovate-oblong. |
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53 L. somae |
