1	Inflorescences generally with prolonged rachis (M. sect. Cymosopaniculatae)		(2)
+	Inflorescences without prolonged rachis		(4)
2 (1)	Main peduncle very long, 14-18 cm; peduncle, rachis, and branches stout and slightly flat.		1 M. thyrsiflora
+	Main peduncle short, less than ca. 4 mm; peduncle, rachis, and branches terete		(3)
3 (2)	Leaf blade narrowly ovate, narrowly ovate-elliptic, or ovate-lanceolate, 4.5-9 × 1.5-3.5 cm; peduncle 2-3 mm.		2 M. semipaniculata
+	Leaf blade oblong-elliptic to oblong, 19-24 × 5.5-6.5 cm; peduncle 3-3.4 mm.		3 M. malipoensis
4 (1)	Inflorescences dichasial; peduncle more than 1 cm; flowers loosely aggregated (M. sect. Remotiflorae)		(5)
+	Inflorescences conferti-dichasial; peduncle less than 1 cm (except M. gracilipes: peduncle 1-2.5 cm); flowers subsessile or sessile, dense (M. sect. Microtropis)		(15)
5 (4)	Flowers 4- or 6-merous		(6)
+	Flowers 5-merous		(8)
6 (5)	Inflorescences 3- or 4-branched; flower buds pyramidal; flowers 4-merous.		12 M. pyramidalis
+	Inflorescences 1- or 2-branched; flower buds subglobose; sepals 4; petals and stamens 6		(7)
7 (6)	Leaf blade 4-7.5 × 1.5-3 cm; inflorescences 3-flowered.		13 M. hexandra
+	Leaf blade 4-15 × 3-5 cm; inflorescences 3-7-flowered.		14 M. henryi
8 (5)	Inflorescences 2-4-branched; peduncle 1-3 cm; flowers more than 7 per inflorescence (M. macrophylla: inflorescences 1- or 2-branched, but peduncle 1.5-2 cm)		(9)
+	Inflorescences 1- or 2-branched; peduncle ca. 1 cm; flowers less than 7 per inflorescence		(12)
9 (8)	Leaf blade small, 4.5-8 cm, leathery, obelliptic to ovate-elliptic, apex obtuse or obtusely acute.		4 M. japonica
+	Leaf blade large, 6.5-15 cm, papery or nearly leathery, apex acuminate, acute, or slightly caudate		(10)
10 (9)	Leaf blade apex narrowly caudate; secondary veins only 3-5 pairs.		5 M. macrophylla
+	Leaf blade apex acuminate or acute; secondary veins 8-13 pairs		(11)
11 (10)	Leaf blade narrowly elliptic, small, 6.5-13 × 2-4.5 cm; secondary veins 9-13 pairs, oblique, straight; capsule ca. 5 cm.		6 M. petelotii
+	Leaf blade broadly elliptic, large, 10-15 × 5-7 cm; secondary veins 8-10 pairs; capsule up to 2 cm.		7 M. fallax
12 (8)	Leaf blade narrow, length 4-5 × width, rectangular-lanceolate or broadly oblanceolate; inflorescences ca. 3-flowered.		11 M. triflora
+	Leaf blade wide, length less than 3 × width, rectangular or elliptic, rarely broadly ovate; inflorescences 3-7- or more flowered		(13)
13 (12)	Branchlets tetragonal; leaf blade 8-13 cm.		10 M. tetragona
+	Branchlets terete, or becoming so at maturity; leaf blade less than 9 cm		(14)
14 (13)	Leaf blade 3.5-7 × 1.5-3.5 cm, apex caudate, secondary veins 4-7 pairs; pedicel ca. 1.5 mm.		8 M. submembranacea
+	Leaf blade 4-9 × 2-4 cm, apex acuminate, secondary veins 11 or 12 pairs; pedicel ± absent.		9 M. pallens
15 (4)	Peduncle long, 1-2.5 cm; branchlets, petioles, and peduncles often with sparse short hairs.		15 M. gracilipes
+	Peduncle absent, very short, or up to 1 cm, generally glabrous		(16)
16 (15)	Leaf blade carnose, irregularly verrucose when dry, rarely papery and without warts when dry		(17)
+	Leaf blade papery or slightly leathery, not carnose, glabrous when dry		(21)
17 (16)	Leaf blade thickly papery, small, 6-11 cm, secondary veins obvious; inflorescences 2-7-flowered		(18)
+	Leaf blade carnose, slightly fleshy, large, 7-18 cm, secondary veins not obvious; inflorescences 5-20-flowered		(19)
18 (17)	Secondary veins 8-11 pairs, oblique, straight; petiole 3-5 mm; flowers 5-merous, inflorescences generally 2-flowered.		23 M. biflora
+	Secondary veins 5-8 pairs, curved; petiole 5-15 mm; flowers 4- or 5-merous, inflorescences 3-7-flowered.		24 M. oligantha
19 (17)	Leaf blade ovate, base broadly cuneate, apex narrowly acute; inflorescences 5-flowered.		25 M. osmanthoides
+	Leaf blade obovate, rectangular, rectangular-elliptic, or broadly oblanceolate; inflorescences more than 10-flowered		(20)
20 (19)	Branchlets brownish; leaf blade ovate, obovate, or rhombic, apex obtuse; petiole 4-6 mm.		26 M. wui
+	Branchlets blackish purple; leaf blade rectangular, elliptic, or broadly oblanceolate, apex acute or shortly acuminate; petiole 8-15 mm.		27 M. obscurinervia
21 (16)	Fruit globose; secondary veins 3-5 pairs.		16 M. sphaerocarpa
+	Fruits elongate; secondary veins 4-11 pairs		(22)
22 (21)	Peduncle 5-10 mm; flowers usually 4-merous, rarely 5-merous.		17 M. yunnanensis
+	Peduncle short, 2-5 mm; flowers 5-merous (M. fokienensis 4- or 5-merous)		(23)
23 (22)	Leaves obovate, oblanceolate, rarely rhombic-elliptic; flowers 4- or 5-merous.		18 M. fokienensis
+	Leaves elliptic, rectangular, or rectangular-elliptic; flowers 5-merous		(24)
24 (23)	Leaves small, 3-10 × 1-4 cm, apex acute or shortly acuminate; petiole short, 3-7 mm		(25)
+	Leaves large, 5-19 × 2-11 cm, apex acuminate, base narrowly cuneate; petiole long, 5-15 mm		(26)
25 (24)	Leaves coriaceous, rhombic-elliptic or narrowly ovate-elliptic; capsule ca. 1.5 cm.		19 M. paucinervia
+	Leaves thickly papery, rectangular-elliptic or narrowly ovate-elliptic; capsule ca. 2 cm.		20 M. reticulata
26 (24)	Secondary veins 7-11 pairs, straight; leaves abaxially brownish when dry; inflorescences 3-7-flowered; capsule smooth without any warts.		21 M. obliquinervia
+	Secondary veins 5-8 pairs, slender and curved; leaves abaxially gray-brown when dry; inflorescences with 7-15 flowers; capsule surface with small warts.		22 M. discolor