1	Leaf blade papery or membranous and deciduous		(2)
+	Leaf blade leathery or thinly leathery and evergreen		(15)
2 (1)	Petiole 2-8 cm; leaf blade orbicular or orbicular-elliptic to broadly ovate		(3)
+	Petiole less than 2 cm; leaf blade not as above		(4)
3 (2)	Leaf blade more than 9.5 cm, auriculate at base; fruit ovoid, 1.3-1.7 × 1.1-1.3 cm, perianth tube cup-shaped.		1 L. auriculata
+	Leaf blade less than 8 cm, base orbicular or cuneate; fruit globose, 0.5-0.6 cm in diam., perianth tube shallowly discoid.		2 L. populifolia
4 (2)	Branchlets glabrous		(5)
+	Branchlets covered with hairs		(10)
5 (4)	Leaf blade glabrous abaxially		(6)
+	Leaf blade hairy abaxially or at least in axils of veins		(8)
6 (5)	Leaf blade elliptic or lanceolate-elliptic; flowers 10-12 per umbel; filaments glabrous; pedicels hairy.		5 L. rubescens
+	Leaf blade lanceolate or oblong; flowers 4-6 per umbel; filaments glabrous or with hairs below middle; pedicels glabrous		(7)
7 (6)	Terminal bud ± hairy; leaf blade ± hairy abaxially when young or in bud.		3 L. cubeba
+	Terminal bud glabrous; leaf blade glabrous on both surfaces even when young or in bud.		4 L. kingii
8 (5)	Young leaves gray-white tomentose abaxially; leaf blade obovate or obovate-elliptic, often larger, 7-11 × 3-5 cm.		8 L. tsinlingensis
+	Young leaves hairy only in axils of veins or on each side of midrib; leaf blade often smaller, 2-5 × 1-3 cm		(9)
9 (8)	Leaf blade usually obovate or rotund, sometimes glandular-domed in axils of veins; lateral veins 4-6 pairs.		6 L. ichangensis
+	Leaf blade elliptic, elliptic-lanceolate, or elliptic-obovate, not glandular-domed in axils of veins; lateral veins 5-8 pairs.		7 L. chunii
10 (4)	Branchlets and leaf blade abaxially covered with pubescence or tomentum, indumentum of young branchlets scarcely deciduous, persistent in 2-year-old branchlets		(11)
+	Branchlets and leaf blade abaxially sericeous, indumentum of young branchlets soon deciduous, mostly glabrous in 2-year-old flowering and fruiting branchlets		(13)
11 (10)	Leaf blade sericeous-pubescent or with white pubescence abaxially; flowers 4-6 per umbel.		11 L. mollis
+	Leaf blade densely gray-yellow tomentose abaxially; flowers 8-14 per umbel		(12)
12 (11)	Leaf blade ovate, rhombic-ovate, or oblong, 4-15 × 1.5-7 cm; umbel solitary.		9 L. moupinensis
+	Leaf blade elliptic or oblong, 1-13.5 × 3.2-4.5 cm; umbels in pairs seated on common peduncle.		10 L. taronensis
13 (10)	Young branchlets and leaf blade abaxially shortly gray sericeous; leaf blade lanceolate or obovate-lanceolate.		12 L. pungens
+	Young branchlets and leaf blade long yellow or brown sericeous; leaf blade oblong-lanceolate, obovate-oblong, or obovate		(14)
14 (13)	Leaf blade oblong-lanceolate, apex acuminate; peduncles glabrous.		13 L. sericea
+	Leaf blade obovate or obovate-oblong, acute or obtuse at apex; peduncles hairy.		14 L. veitchiana
15 (1)	Perianth segments imperfect, lacking, or 3 or 4		(16)
+	Perianth segments 6-8		(17)
16 (15)	Perianth segments imperfect or lacking; fertile stamens usually 15 or more; fruit globose; leaf blade gray-yellow tomentose or subglabrous abaxially.		15 L. glutinosa
+	Perianth segments 3 or 4; fertile stamens 9; fruit ellipsoid; leaf blade along veins shortly hirsute abaxially.		16 L. morrisonensis
17 (15)	Perianth tube not or slightly enlarged at fruit; fruiting tube complanate or shallowly discoid		(18)
+	Perianth tube very enlarged at fruit; fruit ± surrounded by discoid or cup-shaped fruiting tube		(35)
18 (17)	Leaves verticillate, usually 3-6 per whorl		(19)
+	Leaves opposite or alternate		(20)
19 (18)	Young branchlets and petioles densely ferruginous tomentose; leaf blade leathery, obovate- lanceolate, 3.5-6.8 × 0.9-2.8 cm; umbels lateral in leaf axils.		17 L. verticillifolia
+	Young branchlets and petioles densely yellow or ferruginous hirsute; leaf blade subleathery, lanceolate or oblanceolate-oblong, 7-25 × 2-6 cm; umbels usually clustered at apex of branchlet.		18 L. verticillata
20 (18)	Leaves opposite or subopposite (rarely alternate on same tree)		(21)
+	Leaves alternate		(22)
21 (20)	Leaf blade glabrous or subglabrous abaxially; leaves and buds usually tinged with red after autumn.		19 L. variabilis
+	Leaf blade yellow-brown or ferruginous tomentose abaxially; leaves and buds not tinged with red after autumn.		20 L. lancifolia
22 (20)	Peduncles and pedicels absent.		21 L. rotundifolia
+	Peduncles and pedicels present, if peduncles absent, pedicels still present		(23)
23 (22)	Perianth segments deciduous at fruit; fruit long ellipsoid or long ovoid to globose		(24)
+	Perianth segments persistent at fruit; fruit globose or subglobose		(29)
24 (23)	Flowers 2 or 3 per umbel		(25)
+	Flowers 4-6 or more per umbel		(26)
25 (24)	Leaf blade smaller, 4-11 × 1.5-3.5 cm, yellow-brown pubescent abaxially.		29 L. balansae
+	Leaf blade larger, 9-16.5 × 3-6.5 cm, glabrous abaxially.		30 L. biflora
26 (24)	Leaf blade long caudate at apex, foveolate on both surfaces; fruit globose.		31 L. beilschmiediifolia
+	Leaf blade acuminate, acute, obtuse, or rounded at apex, not foveolate on both surfaces; fruit long ellipsoid or long ovoid		(27)
27 (26)	Branchlets and petioles glabrous; leaf blade yellow-brown puberulent abaxially.		32 L. salicifolia
+	Branchlets and petioles hairy; leaf blade ferruginous pubescent, pubescent along veins, or glabrous abaxially		(28)
28 (27)	Branchlets and petioles ferruginous pubescent; leaf blade abaxially ferruginous pubescent, apex obtuse or rounded.		33 L. monopetala
+	Branchlets and petioles gray appressed pubescent; leaf blade glaucous, glabrous, or pubescent along veins abaxially, apex acuminate.		34 L. albescens
29 (23)	Peduncles absent; fruiting pedicels stout; persistent perianth segments 6, regular, usually erect		(30)
+	Peduncles present; fruiting pedicels usually slender; persistent perianth segments 2-4, irregular, reflexed		(31)
30 (29)	Young branchlets and young leaf blade abaxially glabrous or densely gray-yellow villous; leaf blade obovate-elliptic, obovate-lanceolate, oblong, or lanceolate, 4.5-9.5 × 1.4-4 cm.		22 L. coreana
+	Young branchlets gray pubescent and young leaf blade abaxially glaucous and gray- white villous along midrib; leaf blade narrowly lanceolate or lanceolate to elliptic, 10-13 × 2-3.5 cm.		23 L. hupehana
31 (29)	Branchlets, petioles, and filaments glabrous; fruit larger, 2-3 cm in diam		(32)
+	Branchlets, petioles, and filaments hairy; fruit smaller, less than 1 cm in diam		(33)
32 (31)	Leaf blade not foveolate on both surfaces and adaxially glabrous but ± hairy abaxially along veins; fruit globose, fruiting pedicel somewhat thickened at apex, as peduncle ± hairy and not verrucose.		24 L. honghoensis
+	Leaf blade foveolate and glabrous on both surfaces; fruit ovoid, fruiting pedicel shallowly cup-shaped at apex, as peduncle glabrous and verrucose.		25 L. cangyuanensis
33 (31)	Leaf blade abaxially, petioles, and peduncles densely ferruginous tomentose.		28 L. umbellata
+	Leaf blade abaxially, petioles, and peduncles covered with brown pubescence or long gray-yellow pubescence		(34)
34 (33)	Leaf blade greenish abaxially; umbels 2 in leaf axils at tips of branchlets; fruiting pedicels shorter, less than 2 mm.		26 L. foveola
+	Leaf blade blue-green abaxially; several umbels axillary on shortened branchlets; fruiting pedicels longer, more than 6 mm.		27 L. coelestis
35 (17)	Some umbels inserted on long or slightly long peduncles in panicles, racemes, or near corymbs		(36)
+	Umbels solitary or fascicled		(43)
36 (35)	Young branchlets and leaf blade abaxially glabrous		(37)
+	Young branchlets and leaf blade abaxially hairy (only in L. panamanja glabrous abaxially)		(39)
37 (36)	Leaf blade larger, 21-50 × 11-14.5 cm, lateral veins 15-22 pairs.		35 L. dilleniifolia
+	Leaf blade smaller, 10-21 × 3-8 cm, lateral veins 7-12 pairs		(38)
38 (37)	Leaf blade midrib prominent adaxially, lateral veins 10-12 pairs; fertile stamens 26-32.		36 L. liyuyingii
+	Leaf blade midrib impressed adaxially, lateral veins 7-9 pairs; fertile stamens 9.		37 L. szemaois
39 (36)	Leaf blade abaxially and petiole glabrous; fruit compressed globose.		38 L. panamanja
+	Leaf blade abaxially and petiole yellow-brown or ferruginous pubescent (at least young leaves so); fruit oblong or compressed globose		(40)
40 (39)	Petiole more than 2 cm; perianth segments 8; fertile stamens 12-14; fruit compressed globose.		39 L. semecarpifolia
+	Petiole less than 2 cm; perianth segments 6; fertile stamens 9; fruit oblong		(41)
41 (40)	Leaf blade obovate to obovate-oblong, rounded, mucronate at apex.		42 L. longistaminata
+	Leaf blade elliptic or elliptic-lanceolate, acuminate, long acuminate, or falcate-acuminate at apex		(42)
42 (41)	Leaf blade lateral veins 6-8 pairs; fruiting tube deeply cup-shaped.		40 L. martabanica
+	Leaf blade lateral veins 8-12 pairs; fruiting tube shallowly discoid.		41 L. tibetana
43 (35)	Leaves clustered toward apex of branchlet, subverticillate.		74 L. machiloides
+	Leaves alternate		(44)
44 (43)	Young branchlets glabrous or subglabrous; petiole usually glabrous when young		(45)
+	Young branchlets and petioles hairy (petioles glabrous in L. baviensis and L. chinpingensis)		(54)
45 (44)	Leaf blade smaller, mostly less than 9 cm		(46)
+	Leaf blade larger, mostly more than 10 cm		(49)
46 (45)	Young branchlets glabrous or densely pubescent; leaf blade midrib prominent adaxially; peduncles slender.		43 L. pedunculata
+	Young branchlets glabrous; leaf blade midrib plane or impressed adaxially; peduncles stouter and shorter		(47)
47 (46)	Leaf blade oblong or narrowly oblong, usually 4 × as long as wide, slightly acute or obtuse at apex.		46 L. kwangtungensis
+	Leaf blade elliptic, obovate, obovate-lanceolate, or lanceolate, ca. 2-3 × as long as wide, rounded-obtuse or shortly acute or acuminate at apex		(48)
48 (47)	Leaf blade elliptic or rarely obovate, 2 × as long as wide, rounded-obtuse at both ends or base cuneate; fruiting tube cup-shaped.		44 L. pittosporifolia
+	Leaf blade obovate-lanceolate or lanceolate, 3 × as long as wide, shortly acute or acuminate at apex, cuneate or acute at base; fruiting tube discoid.		45 L. hunanensis
49 (45)	Branchlets with corky cortices or spots		(50)
+	Branchlets without corky cortices or spots		(51)
50 (49)	Branchlets with corky cortices; leaf blade oblanceolate or narrowly long elliptic; fertile stamens 9; filaments villous.		47 L. suberosa
+	Branchlets with corky spots; leaf blade elliptic; fertile stamens 12(-14); filaments pubescent.		48 L. chengshuzhii
51 (49)	Fruit compressed globose, 2-2.2 × ca. 3 cm		(52)
+	Fruit ellipsoid or oblong, 1-2.5 × 0.3-1.4 cm		(53)
52 (51)	Leaf blade lateral veins 6-10 pairs.		49 L. depressa
+	Leaf blade lateral veins 16-20 pairs.		50 L. garciae
53 (51)	Leaf blade midrib conspicuously prominent on both surfaces; fruit oblong, larger, 1.5-2.5 × 1-1.4 cm; fruiting tube discoid.		51 L. lancilimba
+	Leaf blade midrib impressed adaxially; fruit ellipsoid, smaller, ca. 1.5 × 0.8 cm; fruiting tube cup-shaped.		52 L. subcoriacea
54 (44)	Young branchlets and petioles puberulent or pubescent, soon deciduous, 2-year-old flowering and fruiting branchlets mostly glabrous		(55)
+	Young branchlets and petioles covered with tomentum or pubescence, indumentum late deciduous, 2-year-old branchlets still covered with more hairs		(63)
55 (54)	Terminal bud scaly; fruit smaller, less than 1.5 × 1 cm		(56)
+	Terminal bud naked; fruit larger, more than 2 × 1.3 cm		(59)
56 (55)	Leaf blade glabrous abaxially.		53 L. greenmaniana
+	Leaf blade gray-yellow pubescent or along veins pilose abaxially		(57)
57 (56)	Young branchlets pubescent; leaf blade pubescent abaxially; lateral veins 5-7 pairs.		54 L. hypophaea
+	Young branchlets puberulent or subglabrous; leaf blade puberulent abaxially; lateral veins 8-10 pairs		(58)
58 (57)	Leaf blade lanceolate, oblanceolate, or oblong, usually narrower; rudimentary pistil present.		55 L. gongshanensis
+	Leaf blade elliptic, usually broader; rudimentary pistil absent.		56 L. viridis
59 (55)	Fruiting peduncles and pedicels 2-3 mm		(60)
+	Fruiting peduncles more than 5 mm; fruiting pedicels more than 10 mm		(61)
60 (59)	Leaf blade lateral veins 7 or 8 pairs; fruiting tube thickly woody, larger, warty outside.		60 L. baviensis
+	Leaf blade lateral veins 10-12 pairs; fruiting tube leathery, smaller, not warty outside.		61 L. litseifolia
61 (59)	Leaf blade gray puberulent or along veins pubescent abaxially; fruiting tube cup-shaped.		57 L. yunnanensis
+	Leaf blade glabrous abaxially; fruiting tube discoid or cup-shaped		(62)
62 (61)	Leaf blade lanceolate or narrowly elliptic, usually narrower, less than 4 cm in diam.; lateral veins 7-11 pairs; fruiting tube discoid, not dehiscent.		58 L. chinpingensis
+	Leaf blade elliptic, usually broader, more than 4 cm in diam.; lateral veins 5-7 pairs; fruiting tube cup-shaped, with many lenticels.		59 L. vang
63 (54)	Leaf blade broadly linear; fruit long ovoid.		62 L. pseudoelongata
+	Leaf blade not broadly linear; fruit not long ovoid		(64)
64 (63)	Petiole less than 8 mm		(65)
+	Petiole mostly more than 10 mm		(66)
65 (64)	Leaf blade lateral veins 4 or 5 pairs, impressed abaxially; perianth segments persistent at fruit.		63 L. oligophlebia
+	Leaf blade lateral veins 8-12 pairs, slightly prominent or prominent adaxially; perianth segments deciduous at fruit.		64 L. yaoshanensis
66 (64)	Leaf blade glabrous or only along veins hairy abaxially		(67)
+	Leaf blade hairy abaxially		(68)
67 (66)	Leaf blade obovate or oblong-obovate, along veins pubescent abaxially, lateral veins 5-8 pairs.		65 L. akoensis
+	Leaf blade lanceolate or oblong-oblanceolate, glabrous abaxially, lateral veins 8-12 pairs.		66 L. kwangsiensis
68 (66)	Flowers ca. 20 per umbel.		67 L. liboshengii
+	Flowers 3-6 per umbel		(69)
69 (68)	Fruit globose or subglobose; leaf buds axillary.		68 L. sinoglobosa
+	Fruit ellipsoid; leaf buds mostly inserted at apex of branchlet		(70)
70 (69)	Leaf blade obovate or broadly oblong, broader, mostly more than 5 cm in diam		(71)
+	Leaf blade lanceolate, narrowly lanceolate, oblong-lanceolate to oblanceolate, or oblong to lanceolate-elliptic, usually narrower, mostly less than 4 cm in diam		(72)
71 (70)	Young branchlets, leaf blade abaxially, petioles, and inflorescences covered with gray-white tomentum; fruit ca. 1.3 cm.		69 L. wilsonii
+	Young branchlets, leaf blade abaxially, petioles, and inflorescences gray-brown pubescent; fruit ca. 0.8 cm.		70 L. hayatae
72 (70)	Young branchlets densely brown tomentose; leaf blade lateral veins 10-20 pairs; umbels mostly solitary.		73 L. elongata
+	Young branchlets densely gray-yellow or yellow-brown villous; leaf blade lateral veins 5-10 pairs; umbels mostly clustered		(73)
73 (72)	Leaf blade lanceolate-elliptic, narrower, less than 2.5 cm in diam., midrib slightly prominent abaxially, transverse veinlets inconspicuous abaxially.		71 L. kobuskiana
+	Leaf blade lanceolate, oblanceolate, or oblong-lanceolate, broader, mostly more than 2.5 cm in diam., midrib impressed adaxially, transverse veinlets conspicuously prominent.		72 L. acutivena