| 1 |
Pseudobulbs 2-leaved |
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(2) |
| + |
Pseudobulbs, or shoot tip if pseudobulbs inconspicuous, 1-leaved |
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(3) |
| |
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|
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| 2 (1) |
Lateral sepals 2-5 × as long as dorsal sepal. |
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17 B. sect. Tripudianthes (p. 438) |
| + |
Lateral sepals ca. as long as dorsal sepal or slightly longer. |
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18 B. sect. Pleiophylla (p. 438) |
| |
|
|
|
| 3 (1) |
All inflorescences 1-flowered |
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(4) |
| + |
Racemose inflorescences (i.e., with 2 or more flowers) present |
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(12) |
| |
|
|
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| 4 (3) |
Petals 5- or more veined |
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(5) |
| + |
Petals 1-3-veined |
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(7) |
| |
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|
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| 5 (4) |
Dorsal sepal ciliate or denticulate. |
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13 B. "Section 13" (63. B. bicolor, 69. B. chinense; p. 427) |
| + |
Dorsal sepal glabrous |
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(6) |
| |
|
|
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| 6 (5) |
Node at base of pedicel at least 1.5 × width of pedicel above subtending bract. |
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2 B. sect. Sestochilos (p. 409) |
| + |
Node at base of pedicel coinciding with bract attachment, or removed from it less than 1 × width of pedicel. |
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1 B. sect. Leopardina (p. 406) |
| |
|
|
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| 7 (4) |
New shoots arising well away from basal node of pseudobulb; pseudobulbs distinctly present. |
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5 B. sect. Macrocaulia (p. 415) |
| + |
New shoots arising from base of pseudobulb; or pseudobulbs minute, inconspicuous compared to size of plant |
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(8) |
| |
|
|
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| 8 (7) |
Lateral sepals ca. 2 × as long as dorsal sepal. |
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13 B. "Section 13" (64. B. omerandrum; p. 427) |
| + |
Lateral sepals ca. as long as or slightly longer than dorsal sepal |
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(9) |
| |
|
|
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| 9 (8) |
Basal node of pedicel well above attachment of floral bract |
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(10) |
| + |
Basal node of pedicel level with attachment of floral bract |
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(11) |
| |
|
|
|
| 10 (9) |
Rhizome creeping, roots spreading; petals without appendages. |
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7 B. sect. Monanthaparva (p. 416) |
| + |
Rhizome pendulous, roots growing over it toward point of attachment to substrate; petals with appendages. |
|
3 B. sect. Epicranthes (p. 410) |
| |
|
|
|
| 11 (9) |
Pseudobulbs distinctly present. |
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6 B. sect. Monanthes (p. 416) |
| + |
Pseudobulbs absent or minute, inconspicuous compared to size of plant. |
|
16 B. sect. Stachysanthes (p. 436) |
| |
|
|
|
| 12 (3) |
Petals 5- or more veined |
|
(13) |
| + |
Petals 1-3-veined |
|
(15) |
| |
|
|
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| 13 (12) |
Dorsal sepal ciliate or denticulate. |
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13 B. "Section 13" (63. B. bicolor, 69. B. chinense; p. 427) |
| + |
Dorsal sepal glabrous |
|
(14) |
| |
|
|
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| 14 (13) |
Lateral sepals twisted inward near base so that upper margins are turned toward one another. |
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12 B. sect. Umbellata (56. B. umbellatum; p. 422) |
| + |
Lateral sepals not twisted inward near base. |
|
1 B. sect. Leopardina (p. 406) |
| |
|
|
|
| 15 (12) |
Lip with small auricles well above base |
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(16) |
| + |
Lip without auricles well above base, or with retrorse auricles immediately next to ligament |
|
(17) |
| |
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|
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| 16 (15) |
Raceme elongated, or raceme congested and floral bracts longer than pedicel plus ovary. |
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9 B. sect. Anisopetalon (p. 418) |
| + |
Raceme subumbellate, floral bracts shorter than pedicel plus ovary. |
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14 B. sect. Cirrhopetalum (72. B. picturatum; p. 430) |
| |
|
|
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| 17 (15) |
Petal margins glabrous |
|
(18) |
| + |
Petal margins (irregularly) denticulate, serrate, ciliate, fimbriate, or with glandular appendages |
|
(24) |
| |
|
|
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| 18 (17) |
Pseudobulbs inconspicuous, or very small compared to size of plant |
|
(19) |
| + |
Pseudobulbs distinctly present |
|
(21) |
| |
|
|
|
| 19 (18) |
Inflorescence 2- or 3-flowered. |
|
16 B. sect. Stachysanthes (p. 436) |
| + |
Inflorescence 5- or more flowered |
|
(20) |
| |
|
|
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| 20 (19) |
Raceme congested, subumbellate. |
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12 B. sect. Umbellata (p. 422) |
| + |
Raceme elongated. |
|
16 B. sect. Stachysanthes (92. B. apodum; p. 436) |
| |
|
|
|
| 21 (18) |
Lateral sepals twisted inward near base so that upper margins are turned toward one another; upper margins fused or free; or lateral sepals ca. 8 mm wide |
|
(22) |
| + |
Lateral sepals not twisted inward near base, free, ± spreading; lateral sepals 1-3 mm wide |
|
(23) |
| |
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|
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| 22 (21) |
Lateral sepals fused along their upper margins; or lateral sepals free, and petals 4-7 mm. |
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12 B. sect. Umbellata (p. 422) |
| + |
Lateral sepals free; petals ca. 2 mm. |
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4 B. sect. Corymbosa (20. B. ledungense; p. 411) |
| |
|
|
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| 23 (21) |
Stelidia deltoid to subulate, rounded to acuminate, not twisted inward. |
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4 B. sect. Corymbosa (p. 411) |
| + |
Stelidia clavate (?spatulate), twisted inward. |
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12 B. sect. Umbellata (46. B. macraei; p. 422) |
| |
|
|
|
| 24 (17) |
Raceme congested, flowers all radiating from ± same point, arranged in an umbel |
|
(25) |
| + |
Raceme elongate |
|
(27) |
| |
|
|
|
| 25 (24) |
Dorsal sepal glabrous with a terminal thread ending in a widened palea, or dorsal sepal ciliate. |
|
14 B. sect. Cirrhopetalum (p. 430) |
| + |
Dorsal sepal glabrous without a terminal thread ending in a palea, or dorsal sepal papillose, denticulate, erose, or with glandular appendages |
|
(26) |
| |
|
|
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| 26 (25) |
Lateral sepals twisted inward near base so that upper margins are turned toward one another; upper margins fused or free. |
|
13 B. "Section 13" (p. 427) |
| + |
Lateral sepals diverging, not twisted inward. |
|
8 B. "Section 8" (30. B. levinei; p. 417) |
| |
|
|
|
| 27 (24) |
Dorsal sepal ciliate |
|
(28) |
| + |
Dorsal sepal glabrous |
|
(29) |
| |
|
|
|
| 28 (27) |
Lip with minute, retrorse auricles at its base, immediately next to ligament. |
|
10 B. sect. Hirtula (p. 419) |
| + |
Lip without auricles at its base. |
|
8 B. "Section 8" (32. B. insulsoides; p. 417) |
| |
|
|
|
| 29 (27) |
Inflorescence 2- or 3-flowered. |
|
13 B. "Section 13" (64. B. omerandrum; p. 427) |
| + |
Inflorescence 5- or more flowered |
|
(30) |
| |
|
|
|
| 30 (29) |
Raceme lax, flowers spaced, scattered |
|
(31) |
| + |
Raceme dense, flowers arranged in a ± regular pattern |
|
(32) |
| |
|
|
|
| 31 (30) |
Column foot elongate, causing a gap between petals and lateral sepals. |
|
11 B. sect. Altisceptrum (p. 421) |
| + |
Column foot not elongate, petals and lateral sepals partly overlapping. |
|
8 B. "Section 8" (31. B. eublepharum; p. 417) |
| |
|
|
|
| 32 (30) |
Stelidia without a tooth along lower margin. |
|
9 B. sect. Anisopetalon (33. B. brevispicatum; p. 418) |
| + |
Stelidia with a distinct tooth along lower margin. |
|
15 B. sect. Brachystachya (91. B. repens; p. 435) |
