Bulbophyllum sect. Cirrhopetalum in Flora of China @ efloras.org

14. Bulbophyllum sect. Cirrhopetalum (Lindley) H. G. Reichenbach, Ann. Bot. Syst. 6: 259. 1861.
单叶卷瓣兰组 dan ye juan ban lan zu

Cirrhopetalum Lindley, Gen. Sp. Orchid. Pl. 45, 58. 1830, nom. cons.
Rhizome creeping or straggling; roots sprouting mainly below pseudobulbs, spreading; new shoots arising from basal node of pseudobulb. Pseudobulbs distinct, apex with 1 leaf. Leaves persistent, thick. Inflorescence solitary, arising near pseudobulbs, 1-flowered or a ± subumbellate raceme. Pedicel with basal node ± coinciding with attachment of subtending bract. Sepals 3-5-veined; dorsal sepal with margins ciliate, fimbriate, or with paleaceous appendages (with a single apical thread in Bulbophyllum amplifolium); lateral sepals twisted inward near base, with upper margins approaching or meeting and connate, margins glabrous to ciliolate. Petals: margins fimbriate or with paleaceous appendages, 1-3-veined; lip: margins with or without auricles above base, margins usually ± glabrous, adaxially ± glabrous. Column: stigma not protruding at its base, foot distinct; anther: front margin projecting or not, abaxially with or without a low, rounded crest; pollinia 4, inner ca. 1/2 as long as outer or longer, all without appendages.
Fifty-seven provisionally accepted species: India to W Pacific, also Africa and Madagascar; 17 species (ten endemic) in China.

1 Dorsal sepal entire, with a terminal thread only (2)

+ Dorsal sepal ciliate to fimbriate, or with other appendages along margins (3)

2 (1) Lip with small auricles well above base; stelidia straight or slightly curved downward, triangular. 72 B. picturatum

+ Lip without auricles; stelidia strongly curved downward, hook-shaped and fusiform. 73 B. amplifolium

3 (1) Lateral sepals 15-19 cm. 74 B. rothschildianum

+ Lateral sepals less than 6 cm (4)

4 (3) Scape ca. as long as pseudobulb (5)

+ Scape much longer than pseudobulb (6)

5 (4) Lateral sepals 5-7 mm, ca. 2 × as long as dorsal sepal or shorter. 75 B. brevipedunculatum

+ Lateral sepals ca. 10 mm, ca. 2.5 × as long as dorsal sepal or longer. 76 B. henanense

6 (4) Lateral sepals 0.7-1.4 cm (7)

+ Lateral sepals 1.5-3.5 cm or longer (8)

7 (6) Adaxial surface of lip glabrous; lateral sepals 0.7-1.1 cm. 77 B. albociliatum

+ Adaxial surface of lip partly papillose; lateral sepals 1.2-1.4 cm. 78 B. kuanwuense

8 (6) Lateral sepals long caudate at apex. 79 B. pecten-veneris

+ Lateral sepals obtuse to acute at apex (9)

9 (8) Stelidia of column narrowly lanceolate, ca. 5 mm. 80 B. longibrachiatum

+ Stelidia of column toothlike, filiform, or subulate, less than 1.5 mm (10)

10 (9) Lateral sepals free, with or without upper and lower margin inrolled; or lateral sepals partly connate and with upper and lower margin inrolled (11)

+ Lateral sepals connate along upper margin, without inrolled margins (lateral sepals may be folded over midvein) (13)

11 (10) Lateral sepals without inrolled margins, free. 81 B. taiwanense

+ Lateral sepals with inrolled margins, free or partly connate (12)

12 (11) Lateral sepals ca. 3.4 cm; lip with 2 keels adaxially. 82 B. setaceum

+ Lateral sepals 1.2-1.5 cm; lip without keels adaxially. 83 B. melanoglossum

13 (10) Floral bracts 7-8 mm; column ca. 6 mm. 84 B. pingtungense

+ Floral bracts 3-5 mm; column 1-3 mm (14)

14 (13) Lip with 2 longitudinal grooves and between them a keel adaxially. 85 B. tseanum

+ Lip without grooves and keel as above (15)

15 (14) Stelidia suborbicular. 86 B. lepidum

+ Stelidia subulate (16)

16 (15) Dorsal sepal acuminate. 87 B. hirundinis

+ Dorsal sepal rounded to obtuse. 88 B. fimbriperianthium