1	Roots without tuber; seeds with broad membranous wing.		1 H. graciliflora
+	Roots with tuber (except possibly for H. heterosperma); seeds without wing or with thin woody wing		(2)
2 (1)	Flower smaller, corolla 3-7 mm in diam		(3)
+	Flower larger, corolla 8-15 mm in diam		(4)
3 (2)	Corolla bowl-shaped, 5-7 mm in diam.; petals fleshy; fruit conical to cylindric, 2.4-3.5 cm × 8-10 mm; seeds oblong-elliptic to ovate, with a corky wing.		2 H. delavayi
+	Corolla laxly patelliform, 3-5 mm in diam.; petals membranous-herbaceous; fruit obconic, 2-4 cm × 12-15 mm; seeds lenticular, ± isodiametric, unwinged.		3 H. kunmingensis
4 (2)	Corolla segments spreading, explanate, or ascending, corolla bowl-shaped or rotate		(5)
+	Corolla segments reflexed or revolute, corolla umbelliform or ± globose		(12)
5 (4)	Seeds strongly biconvex, almost without wing, margin slightly broad, 1-1.3(-2) mm; fruit conical to terete-elliptic		(6)
+	Seeds oblong, lenticular, or strongly biconvex, margin narrower, less than 1 mm in diam.; fruit globose, narrowly elliptic, or narrowly conical		(8)
6 (5)	Corolla 15-20 cm, yellow-green, segments broadly ovate.		6 H. panlongqi
+	Corolla 10-13 cm, green or pale green, segments strap-shaped; fruit conical or terete-conical		(7)
7 (6)	Corolla segments ascending; flower buds obtuse at apex.		4 H. macrocarpa
+	Corolla segments spreading or reflexed; flower buds acute at apex.		5 H. mitrata
8 (5)	Seeds oblong, with thin corky wing; fruit narrowly elliptic to narrowly conical.		7 H. dipterygia
+	Seeds biconvex, without wing; fruit globose or conical		(9)
9 (8)	Seeds lenticular; corolla bowl-shaped.		11 H. sphaerocarpa
+	Seeds ovate to orbicular; corolla rotate		(10)
10 (9)	Fruit globose, pedicel with an articulation.		8 H. amabilis
+	Fruit conical or cylindric, pedicel without an articulation		(11)
11 (10)	Fruit apex with distinct style; corolla segments lanceolate.		9 H. heterosperma
+	Fruit apex without distinct style; corolla segments ovate-orbicular.		10 H. lijiangensis
12 (4)	Seed margin narrower; corolla red-brown or pale red-brown, base often dark red-brown		(13)
+	Seed margin smooth; corolla pale yellow or yellow-green		(18)
13 (12)	Leaflets 9-11; corolla bowl-shaped, 8-10 mm in diam.		25 H. endecaphylla
+	Leaflets (3-)5-9		(14)
14 (13)	Corolla Chinese lanternlike		(15)
+	Corolla bowl-shaped (H. dulongjiangensis corolla unknown)		(16)
15 (14)	Fruit elliptic; corolla 10-15 mm in diam.		20 H. chinensis
+	Fruit ovoid to globose; corolla 20-25 mm in diam.		21 H. gigantha
16 (14)	Fruit elliptic, 5-8 cm; seed margin erose.		22 H. dolichocarpa
+	Fruit ovoid to globose, 3-4 cm		(17)
17 (16)	Seed margin smooth; fruiting pedicel with an articulation; leaflets 5-7, elliptic-lanceolate.		23 H. macrosperma
+	Seeds margin erose; fruiting pedicel without an articulation; leaflets 3-5, rhombic.		24 H. dulongjiangensis
18 (12)	Fruit globose or subglobose		(19)
+	Fruit conical or elliptic to claviform-elliptic		(21)
19 (18)	Corolla umbelliform, 10-12 mm in diam.; fruiting pedicel with an articulation.		12 H. panacis-scandens
+	Corolla Chinese lanternlike or bowl-shaped, 6-12 mm in diam		(20)
20 (19)	Corolla Chinese lanternlike; fruit 2-2.5 cm in diam.		13 H. emeiensis
+	Corolla bowl-shaped; fruit 3-3.5 cm in diam.		14 H. pengxianensis
21 (18)	Fruit elliptic or claviform, over 7 cm		(22)
+	Fruit conical to elliptic, 3.5-5 cm		(23)
22 (21)	Fruit narrowly elliptic-claviform, distinctly longitudinally costate, 7-8 cm, pedicel with indistinct articulation.		18 H. chengyihana
+	Fruit broadly to narrowly elliptic, indistinctly costate, (6-)11-17 cm, pedicel with distinct articulation.		19 H. zhejiangensis
23 (21)	Corolla bowl-shaped, segments carnose, 8-9 mm; fruit elliptic to ovoid.		17 H. carnosiflora
+	Corolla Chinese lanternlike, segments thinner		(24)
24 (23)	Fruit conical, base cuneate; corolla segments 14-17 mm.		15 H. turbinata
+	Fruit elliptic; base obtuse; corolla segments 10-15 mm.		16 H. ellipsoidea