1	Plants 0.02-0.5(-2) m tall; stems slender or rarely somewhat robust, herbaceous or rarely subshrubby toward base or throughout; flowers commonly entomophilous; corolla 1-20(-46) mm, commonly bilabiate or sub-bilabiate (if unilabiate then no more than 15 mm), lobes dimorphic or monomorphic; seed coat striate or reticulate		(2)
+	Plants (0.2-)1-9 m tall; stems robust and sometimes pachycaul, herbaceous, subshrubby, or woody; flowers often ornithophilous; corolla unilabiate or sub-bilabiate, rarely bilabiate, (12-)20-60(-103) mm, lobes monomorphic; seed coat reticulate or striate-reticulate, less often striate		(8)
2 (1)	Plants low, stems commonly prostrate and seldom over 40 cm tall; corolla various shades of blue, purple, pink, or white, sub-bilabiate or unilabiate, lobes monomorphic; anther tube with a single elongate bristle or awn at apex of each ventral anther (sometimes also bearded with tufts of shorter filiform hairs, very rarely nude); seed coat commonly reticulate (1. L. sect. Hypsela)		(3)
+	Plants taller, stems erect, ascending, or decumbent, commonly over 40 cm (sometimes as much as 2 m) tall; corolla distinctly bilabiate, lobes dimorphic, dorsal pair much smaller and narrower than ventral 3 (that commonly form a trifid lip); anther tube bearded with tufts of filiform hairs at apex of at least ventral pair (rarely all nude); seed coat striate		(4)
3 (2)	Leaves ovate or broadly ovate, commonly petiolate; corolla sub-bilabiate; fruit a berry.		1 L. nummularia
+	Leaves elliptic-lanceolate to linear; corolla unilabiate; fruit a capsule.		2 L. chinensis
4 (2)	Pedicels typically bibracteolate at base; corolla tube commonly fenestrate laterally; seeds terete or irregularly angular (2. L. sect. Stenotium)		(5)
+	Pedicels typically bibracteolate at or below middle; corolla tube almost always entire laterally; seeds trigonous or compressed (3. L. sect. Delostemon)		(6)
5 (4)	Stems winged; leaves adaxially sparsely puberulent; corolla small, only 3-5 mm.		3 L. heyneana
+	Stems terete or angular, not winged; leaves glabrous or villous; corolla larger or also small.		4 L. hainanensis
6 (4)	Stems prostrate, rooted at nodes; leaves 1-4 × 0.8-3 cm; petiole 3-12 mm.		5 L. zeylanica
+	Stems erect, not rooted or rooted only at basal nodes; leaves smaller, subsessile		(7)
7 (6)	Stems and leaves glabrous; bracteoles linear-lanceolate.		6 L. alsinoides
+	Stems and leaves villous; bracteoles absent or minute.		7 L. terminalis
8 (1)	Flowers solitary in upper leaf axils (rarely supplemented by a terminal raceme); corolla tube straight or nearly so; fruit a berry; seeds cuboidal or quadrate, subterete to slightly compressed (5. L. sect. Speirema)		(9)
+	Flowers in terminal racemes or panicles; corolla tube curved or arcuate; fruit a capsule; seeds ovoid, lenticular (4. L. sect. Rhynchopetalum)		(11)
9 (8)	Plants rhizomatous; corolla 12-18 mm, tube 3-6 mm; filament tube 6.5-8 mm; anther tube cream-colored, dorsal anthers 6-8 mm, slightly shorter to slightly longer than filament tube.		23 L. deleiensis
+	Plants lacking rhizomes; corolla (15-)18-26 mm, tube 6-13 mm; filament tube 8.5-12 mm; anther tube gray, dorsal anthers 4.8-7 mm, 2/5-3/4 as long as filament tube		(10)
10 (9)	Stems sparsely to densely puberulent toward apex; leaves sessile; uppermost 10-25 flowers often subtended by bracts only 1/10-1/4 as long as foliage leaves, thus forming a terminal raceme; pedicels densely puberulent; hypanthium pubescent along veins; calyx lobes narrowly triangular or triangular, 1.5-1.9 mm wide, erect; corolla greenish with purple spots on lip; anther tube 1.4-1.8 mm in diam., glabrous; trichomes at apex of ventral anthers 0.5-1 mm.		21 L. fangiana
+	Stems glabrous (rarely sparsely scabrous); leaves petiolate; all flowers subtended by unreduced foliage leaves; pedicels glabrous; hypanthium glabrous; calyx lobes linear or linear-triangular, 0.5-1.4 mm wide, ascending, spreading, or recurved; corolla dark violet or purple to bluish lilac, lip often paler, or striped or blotched with white; anther tube 2-2.8 mm in diam., dorsal surface sparsely shortly pubescent at least toward apex; trichomes at apex of ventral anthers 1.2-2 mm.		22 L. montana
11 (8)	Leaves truncate, rounded, or obtuse at base; pedicels ebracteolate; calyx lobe margins revolute.		20 L. sessilifolia
+	Leaves cuneate or attenuate at base; pedicels commonly bibracteolate; calyx lobe margins flat		(12)
12 (11)	Stems densely pubescent		(13)
+	Stems glabrous or sparsely pubescent		(15)
13 (12)	Stems tomentose; leaves hispidulous; pedicels 5-12 mm, densely pannose; hypanthium densely pannose; corolla white or faintly tinged with blue or pink.		13 L. clavata
+	Stems hispidulous or scaberulose; leaves glabrous adaxially and sometimes abaxially; pedicels 3-5 mm, hispidulous; hypanthium scaberulose; corolla purple-red or red-purple		(14)
14 (13)	Capsule 6-10 × 6-8 mm; raceme 10-25 cm, densely flowered.		19 L. erectiuscula
+	Capsule 4-6 × 4-5 mm; raceme 20-50 cm, laxly flowered.		18 L. davidii
15 (12)	Corolla 11-20 mm		(16)
+	Corolla 20-35 mm		(19)
16 (15)	Leaves rounded and mucronate at apex; corolla glabrous.		16 L. colorata
+	Leaves acuminate (sometimes acute or obtuse) at apex; corolla pubescent at least internally		(17)
17 (16)	Leaves 12-31 cm, attenuate at base; corolla white, sometimes suffused with pale blue or pink; anther tube densely white hirsute in sutures; flowering Jan-May.		10 L. pyramidalis
+	Leaves 6-12(-15) cm, cuneate at base; corolla purple-red, reddish, or blue-purple; anther tube sparingly pubescent on back; flowering Aug-Oct		(18)
18 (17)	Stems and leaves glabrous; pedicels 3-5 mm; calyx lobes 13-21 × < 1 mm, entire.		8 L. melliana
+	Stems sparsely pubescent; leaves densely white hirsute; pedicels 5-13 mm; calyx lobes 6-14 × 1-1.5 mm, denticulate.		9 L. pleotricha
19 (15)	Bracteoles leaflike, denticulate, 6-12 × 1-2 mm, at summit of pedicel.		15 L. foliiformis
+	Bracteoles subulate, entire, 1-2 × ca. 0.2 mm, near middle of pedicel		(20)
20 (19)	Leaves 3.5-7 cm, obtuse or acute at apex.		17 L. taliensis
+	Leaves (6-)10-35 cm, acuminate at apex		(21)
21 (20)	Raceme lax; hypanthium hemispheric.		14 L. iteophylla
+	Raceme dense; hypanthium campanulate, oblong, or obconic		(22)
22 (21)	Leaves glabrous abaxially; hypanthium glabrous; calyx lobes entire.		11 L. seguinii
+	Leaves sparsely hispidulous abaxially; hypanthium scaberulose; calyx lobes denticulate.		12 L. doniana