1	Stem either very short with basal leaves or elongate and rather stout (4-7 mm in diam.) with large cauline leaves (4.5-)6-23 cm		(2)
+	Stem elongate and slender (ca. 2 mm in diam.) with small cauline leaves 1-2.5(-4.5) cm		(15)
2 (1)	Leaves 2-2.5 cm		(3)
+	Leaves more than (3-)5 cm		(4)
3 (2)	Petals suborbicular, fimbriate at margin; lip epichile white hairy adaxially.		13 G. rantabunensis
+	Petals oblong, entire at margin; lip epichile glabrous adaxially.		14 G. xuanenensis
4 (2)	Inflorescence racemose; leaves 3-5 cm.		1 G. platycalcaratus
+	Inflorescence subumbellate; leaves (5-)6-23 cm		(5)
5 (4)	Central cushion on lip epichile with a groove or cavity at base		(6)
+	Central cushion on lip epichile without a groove or cavity at base		(8)
6 (5)	Flowers 2-3 cm in diam.; dorsal sepal 12-17 mm.		2 G. bellinus
+	Flowers 1-1.8 cm in diam.; dorsal sepal 5-10 mm		(7)
7 (6)	Stem 1-2 cm; lip epichile glabrous adaxially.		3 G. hainanensis
+	Stem 5-30 cm; lip epichile with dense papillate hairs adaxially.		4 G. calceolaris
8 (5)	Epichile ± papillate-hairy adaxially		(9)
+	Epichile glabrous adaxially except for cushion		(12)
9 (8)	Leaves linear, 5-8 mm wide; margin of lip epichile irregularly fimbriate.		10 G. linearifolius
+	Leaves ligulate or oblong, 1-2.5 cm wide; margin of lip epichile laciniate-erose		(10)
10 (9)	Epichile transversely oblong or oblate, margin irregularly denticulate.		12 G. acinacifolius
+	Epichile broadly triangular, margin lacerate to erose		(11)
11 (10)	Stem 1-2 cm, with subbasal leaves; petals ± spatulate, yellow with purple spots.		6 G. subpapillosus
+	Stem to 20 cm, with cauline leaves; petals ligulate-oblong, yellowish tinged with brownish at apex.		11 G. yunnanensis
12 (8)	Stem 1-1.5 cm, with subbasal leaves 1.7-6 cm wide; sepals 6-12 × 3.5-6 mm.		9 G. obliquus
+	Stem (2-)5-20 cm, with cauline leaves 0.5-1.2(-1.7) cm wide; sepals 5-6 × 2.2-3 mm		(13)
13 (12)	Epichile 5-8 mm wide, with a papillate cushion adaxially; stem terete.		8 G. japonicus
+	Epichile 3-5 mm wide, with a glabrous cushion adaxially; stem slightly compressed terete		(14)
14 (13)	Lip hypochile narrower than epichile; cushion on epichile extending to subglobose hypochile.		5 G. intermedius
+	Lip hypochile broader than epichile; cushion on epichile not extending to hypochile.		7 G. guangtungensis
15 (1)	Epichile glabrous adaxially		(16)
+	Epichile ± hairy adaxially		(19)
16 (15)	Hypochile broader than epichile; leaves ± with purple-red spots		(17)
+	Hypochile narrower than epichile; leaves without purple-red spots		(18)
17 (16)	Inflorescence 5- or 6-flowered; leaves with 1-3 short awns at apex.		15 G. pseudodistichus
+	Inflorescence 1- or 2-flowered; leaves without awns at apex.		16 G. fuscopunctatus
18 (16)	Epichile suborbicular, with 2 conic calli at base.		17 G. distichus
+	Epichile broadly triangular, without calli at base.		18 G. fargesii
19 (15)	Dorsal sepal 2.2-3 mm		(20)
+	Dorsal sepal 3.5-7 mm		(21)
20 (19)	Hypochile cylindric, 2.8-3 mm tall; epichile reniform.		19 G. nanus
+	Hypochile subglobose, ca. 2 mm tall; epichile triangular.		20 G. ciliaris
21 (19)	Hypochile subcupular or subglobose		(22)
+	Hypochile conic		(25)
22 (21)	Epichile papillate-hairy only on central cushion, surroundings glabrous.		26 G. formosanus
+	Epichile densely shortly hairy adaxially		(23)
23 (22)	Epichile not 2-lobed nor emarginate at apex.		27 G. saccatus
+	Epichile 2-lobed or emarginate at apex		(24)
24 (23)	Epichile rounded and emarginate at apex.		28 G. gongshanensis
+	Epichile subtruncate and deeply 2-lobed at apex.		29 G. nanchuanensis
25 (21)	Saccate hypochile ca. 2 × as tall as wide.		23 G. raraensis
+	Saccate hypochile ca. as tall as or slightly taller than wide		(26)
26 (25)	Saccate hypochile ca. 2 mm tall; epichile obtuse at apex.		21 G. linii
+	Saccate hypochile 3-4.5 mm tall; epichile emarginate or retuse at apex		(27)
27 (26)	Saccate hypochile distinctly curved forward, parallel to epichile; leaves without colored spots.		24 G. matsudae
+	Saccate hypochile not or only slightly curved forward, not parallel to epichile; leaves with purple-red or brownish purple spots		(28)
28 (27)	Epichile 4-5 mm wide; saccate hypochile slightly curved forward; flowers with purple-red spots.		22 G. sinensis
+	Epichile ca. 8 mm wide; saccate hypochile straight; flowers with brown spots.		25 G. hoi