Key 1

1	Stems 1-1.5 cm tall; flowers forming terminal racemes on leafless scapes		1 Lysimachia scapiflora
+	Stems more than 20 cm tall; flowers solitary or in racemes on leafy stems.		(2)
2 (1)	Leaves terminal.		(3)
+	Leaves alternate or opposite, not terminal.		(7)
3 (2)	Flowers in many-flowered racemes, 6-9 cm; capsules indehiscent		2 Lysimachia insignis
+	Flowers in clusters or extremely shortened racemes; capsules dehiscing by valves.		(4)
4 (3)	Leaf blade rounded to obtuse at apex; calyx lanceolate, 6-8 mm; corolla lobes acute at apex		6 Lysimachia crassifolia
+	Leaf blade acute at apex; calyx ovate, 2-4 mm; corolla lobes obtuse at apex.		(5)
5 (4)	Inflorescences distributed along stems under leaf whorls		3 Lysimachia saxicola
+	Inflorescences subterminal.		(6)
6 (5)	Leaves nearly equal, rounded at base		4 Lysimachia dushanensis
+	Leaves unequal, cordate at base		5 Lysimachia linguiensis
7 (2)	Leaves opposite.		(8)
+	Leaves alternate.		(10)
8 (7)	Leaf blade cuneate to rounded at base		36 Lysimachia engleri
+	Leaf blade cordate at base.		(9)
9 (8)	Flowers solitary; leaf blade 1-4 cm		37 Lysimachia cordifolia
+	Flowers usually in pairs; leaf blade 4.5-8 cm		38 Lysimachia biflora
10 (7)	Anthers conical, less than 3.5 × as long as wide; stems herbaceous.		(11)
+	Anthers linear, more than 4 × as long as wide; stems subwoody.		(21)
11 (10)	Flowers in racemes.		(12)
+	Flowers solitary, axillary.		(15)
12 (11)	Bracts subulate; leaf blade with more than 10 pairs of lateral veins		25 Lysimachia physaloides
+	Bracts leaflike; leaf blade with 5-7 pairs of lateral veins.		(13)
13 (12)	Stems not winged; flowers subverticillate		28 Lysimachia subverticillata
+	Stems winged; flowers racemose.		(14)
14 (13)	Racemes corymbiform, 2-5-flowered		26 Lysimachia wilsonii
+	Racemes elongated, 5- to many flowered		27 Lysimachia nutantiflora
15 (11)	Stems ± procumbent at base, upper part erect, rarely branched; leaf blade broadly ovate to elliptic.		(16)
+	Stems erect or sometimes arcuate at base, usually branched; leaf blade lanceolate to narrowly elliptic or oblong-lanceolate.		(18)
16 (15)	Calyx 7-12 mm; corolla 2-3.5 cm in diam.; leaf blade attenuate to cuneate at base		29 Lysimachia foenum-graecum
+	Calyx 2.5-6 mm; corolla 1.2-2 cm in diam.; leaf blade rounded or slightly cordate, rarely cuneate at base.		(17)
17 (16)	Corolla 1.5-2 cm in diam.; calyx 4-6 mm; plants not aromatic		30 Lysimachia trichopoda
+	Corolla ca. 1.2 cm in diam; calyx ca. 2.5 mm; plants aromatic when dry		31 Lysimachia pseudotrichopoda
18 (15)	Corolla 3-5 mm; calyx lobes narrowly ovate, ca. as long as or slightly shorter than corolla; capsules 3.5-4 mm in diam.		32 Lysimachia brachyandra
+	Corolla more than 6 mm; calyx lobes ovate to ovate-elliptic, 1/3 to 1/2 × as long as corolla; capsules more than 5 mm in diam.		(19)
19 (18)	Flowers in racemes continuing apically into vegetative shoots		35 Lysimachia cauliflora
+	Flowers solitary, in axils of upper leaves.		(20)
20 (19)	Corolla 10-15 mm; anthers opening by apical pores		33 Lysimachia grandiflora
+	Corolla 6-8 mm; anthers opening by lateral slits		34 Lysimachia laxa
21 (10)	Flowers in elongated racemes.		(22)
+	Flowers solitary or 2 to many flowers crowded in leaf axils.		(24)
22 (21)	Petiole less than 2 mm; leaf blade rounded or subcordate at base; bracts subulate		7 Lysimachia filipes
+	Petiole 5-30 mm; leaf blade subattenuate at base; at least lower bracts leaflike.		(23)
23 (22)	Calyx lobes lanceolate		8 Lysimachia heterobotrys
+	Calyx lobes ovate		9 Lysimachia chapaensis
24 (21)	Pedicel 3-10(-12) mm.		(25)
+	Pedicel usually more than 12 mm.		(27)
25 (24)	Leaf blade 6-12 × 3-7 cm; calyx 6-9 mm		10 Lysimachia inaperta
+	Leaf blade 0.6-1.7 × 0.2-0.8 cm; calyx 3-4 mm.		(26)
26 (25)	Leaves sparsely setulose adaxially; corolla epunctate		11 Lysimachia aspera
+	Leaves glabrous; corolla glandular punctate		12 Lysimachia tianyangensis
27 (24)	Leaf blade linear or leathery, veinlets obscure.		(28)
+	Leaf blade neither linear nor leathery, veinlets conspicuous.		(30)
28 (27)	Leaf blade linear, subfalcate at apex, herbaceous		13 Lysimachia vittiformis
+	Leaf blade neither linear nor falcate at apex, subleathery.		(29)
29 (28)	Leaves oblanceolate, ± crowded in interrupted whorls		14 Lysimachia pittosporoides
+	Leaves lanceolate, evenly distributed along stems		15 Lysimachia millietii
30 (27)	Calyx ca. as long as to slightly longer than corolla		16 Lysimachia evalvis
+	Calyx shorter than corolla.		(31)
31 (30)	Stems conspicuously angular, usually herbaceous.		(32)
+	Stems terete, subwoody.		(34)
32 (31)	Calyx 5-6 mm, lobes subulate; leaf blade truncate to subcordate at base		22 Lysimachia jingdongensis
+	Calyx 2-4 mm, lobes acuminate; leaf blade subattenuate at base.		(33)
33 (32)	Stems angular or winged, usually much branched; leaf blade ovate to lanceolate		23 Lysimachia capillipes
+	Stems angular, usually simple; leaf blade lanceolate		24 Lysimachia lancifolia
34 (31)	Pedicel ca. as long as to shorter than petiole; capsules indehiscent		17 Lysimachia navillei
+	Pedicel much longer than petiole; capsules dehiscing by valves.		(35)
35 (34)	Capsule 3-4 mm.		(36)
+	Capsule 5-6 mm.		(37)
36 (35)	Leaf blade elliptic-lanceolate to lanceolate; free parts of filaments distinctly longer than sinus of cordate base of anthers		18 Lysimachia fooningensis
+	Leaf blade ovate to ovate-lanceolate; free parts of filaments ca. as long as sinus of cordate base of anthers		19 Lysimachia microcarpa
37 (35)	Leaf blade elliptic to elliptic-lanceolate, 1-3(-4) cm wide		20 Lysimachia ardisioides
+	Leaf blade ovate to elliptic or broadly elliptic, 1.3-7(-9) cm wide		21 Lysimachia petelotii