1	Plants with stellate hairs; prickles often present.		(2)
+	Plants glabrous or with predominantly simple or rarely dendritic hairs, stellate hairs usually absent, if present on leaves, then mixed with simple hairs; prickles mostly absent.		(20)
2 (1)	Plants unarmed; leaves entire; anthers stout, not tapering; inflorescences many-flowered, flat or rounded panicles held upright above foliage in flower and fruit		2 Solanum erianthum
+	Plants mostly armed; leaves mostly dentate or lobed; anthers tapering distally; inflorescences unbranched or 1-branched, rarely more, angling from twigs, held below foliage or along stems.		(3)
3 (2)	Calyx enlarged, closely enveloping most of berry.		(4)
+	Calyx hardly or not enlarged, not enveloping berry.		(7)
4 (3)	Corolla yellow; anthers more than 1 cm, unequal; berry completely enveloped by calyx at maturity; fruiting calyx with dense prickles 1-2 cm		38 Solanum angustifolium
+	Corolla white, blue, or purplish; anthers less than 1 cm, equal; berry partly or completely exposed from enlarged calyx at maturity; fruiting calyx copiously or sparingly armed with prickles less than 1 cm.		(5)
5 (4)	Leaves usually pinnate-parted, lobes pinnately lobed or dentate; stems pubescent with simple, many-celled glandular hairs and few stellate hairs		37 Solanum sisymbriifolium
+	Leaves entire or irregularly dentate; stems with only stellate hairs.		(6)
6 (5)	Inflorescences less than 5 cm, peduncle less than 5 mm; corolla white		36 Solanum griffithii
+	Inflorescences more than 5 cm, peduncle more than 5 mm; corolla blue or purple		35 Solanum barbisetum
7 (3)	Fruit densely stellate hirsute with persistent tomentum; plants tomentose; calyx lobes nearly leaflike, more than 8 mm		34 Solanum lasiocarpum
+	Fruit glabrous; plants variously pubescent; calyx lobes not leaflike, mostly less than 7 mm.		(8)
8 (7)	Corolla more than 5 cm wide, deep purple, fading white, with contrasting abaxial pleats; sturdy trees to 12 m tall; fruit more than 3 cm		26 Solanum wrightii
+	Corolla less than 5 cm wide, white or purple, not conspicuously fading, lacking contrasting pleats; shrubs, or if small trees then trunk slender; fruit mostly less than 3 cm.		(9)
9 (8)	Inflorescences mostly 1-3-branched; plants mostly more than 1 m.		(10)
+	Inflorescences unbranched; plants mostly less than 1 m.		(13)
10 (9)	Leaves 3-5-lobed or parted, with loose and softly lanate pubescence on both surfaces, drying of 1 color; plants overall with rust-colored, short- or long-stalked, bristly-hispid stellate hairs		20 Solanum chrysotrichum
+	Leaves subentire or variously lobed, minutely scabrous with mostly sessile stellate pubescence adaxially, drying of different colors; leaves and stems lacking bristly, long-stalked hairs.		(11)
11 (10)	Corolla white; pedicel with simple glandular hairs mixed with stellate ones; fruit yellow, more than 1 cm in diam.		25 Solanum torvum
+	Corolla blue, violet, or purple; pedicel with stellate hairs only; fruit red, less than 1 cm in diam.		(12)
12 (11)	Leaves subentire or 6- or 7-sinuate lobed, ovate-elliptic; corolla more than 8 mm		22 Solanum macaonense
+	Leaves entire, lanceolate or narrowly oblong; corolla less than 8 mm		21 Solanum luzoniense
13 (9)	Fruit more than 1.4 cm across; flowers mostly andromonoecious.		(14)
+	Fruit less than 1.4 cm across; flowers mostly bisexual.		(16)
14 (13)	Fruit red, often longitudinally furrowed; corolla white or slightly purplish		29 Solanum aethiopicum
+	Fruit mostly yellow or black, not red, not furrowed; corolla blue or violet.		(15)
15 (14)	Fruit mostly much more than 4 cm across, variously shaped, seldom globose, green, white, black, pink, or brown, only yellow at extreme maturity		40 Solanum melongena
+	Fruit mostly less than 4 cm across, globose, green or yellow		39 Solanum undatum
16 (13)	Leaves soon glabrescent, deeply pinnately lobed; stems with copious, compressed, bright yellow, nearly straight prickles often more than 7 mm; anthers more than 7 mm; fruit yellow		41 Solanum virginianum
+	Leaves with persistent indumentum, entire, dentate, or shallowly lobed; stems unarmed or with recurved spines less than 5 mm; anthers mostly less than 7 mm; fruit red or orange.		(17)
17 (16)	Leaves entire; plants unarmed or sparingly armed; inflorescences elongated		23 Solanum nienkui
+	At least some leaves lobed or sinuate; plants armed, sometimes copiously so; inflorescences condensed.		(18)
18 (17)	Leaves mostly less than 4 cm, sinuate; petiole less than 1.5 cm; inflorescences mostly terminal on leafy shoots		24 Solanum procumbens
+	Leaves mostly more than 5 cm, often saliently lobed; petiole mostly more than 1.5 cm; inflorescences mostly extra-axillary or axillary.		(19)
19 (18)	Flowers usually purple; plants evidently armed; fruiting pedicels usually erect, more than 1 cm		27 Solanum violaceum
+	Flowers usually white; plants sparingly armed, occasionally with prickles less than 1 mm; fruiting pedicels strongly recurved, less than 1 cm		28 Solanum deflexicarpum
20 (1)	Anthers lanceolate, tapering to a slender subulate apex; plants with coarse, straight simple hairs, armed with needlelike prickles.		(21)
+	Anthers oblong or ovoid, not tapering; plants glabrescent or with simple or branched hairs, unarmed.		(24)
21 (20)	Fruit orange-red; seeds yellowish, compressed discoid with a conspicuous orbicular wing, 4-6 mm in diam. (including wings)		32 Solanum capsicoides
+	Fruit light yellow; seeds brown, lenticular, unwinged, less than 4 mm in diam.		(22)
22 (21)	Plants villous with mixed stellate and simple, partly glandular hairs; pericarp more than 1 cm thick.		(23)
+	Plants minutely tomentose with simple, many-celled, mostly glandular hairs, only leaves sparsely stellate abaxially; pericarp less than 1 cm thick		30 Solanum aculeatissimum
23 (22)	Stems pilose with some hairs 2 mm; leaf lobes sharp pointed; ovary glabrous; corolla purple		33 Solanum mammosum
+	Stems densely tomentose with hairs less than 1 mm long; leaf lobes blunt tipped; ovary and young fruit pubescent; corolla white or green		31 Solanum viarum
24 (20)	Leaves pinnately compound, at least in part.		(25)
+	Leaves entire or variously parted, but not compound.		(27)
25 (24)	Leaves interruptedly odd-pinnate compound, usually with interstitial leaflets, viscid pubescent; pedicel articulated well above middle; foliage strongly odorous when crushed; calyx divided nearly halfway; underground tubers present		19 Solanum tuberosum
+	Leaves with 1 or 2 pairs of basal leaflets, mostly not glandular, sometimes glabrous; pedicel base articulate or not at all; foliage hardly odorous; calyx lobes short or absent; underground tubers absent.		(26)
26 (25)	Plants glabrous; leaves usually 5-9-parted; calyx subtruncate; anthers free		17 Solanum seaforthianum
+	Plants pubescent; leaves entire or 3-5-parted; calyx with short distinct lobes; anthers connate		11 Solanum dulcamara
27 (24)	Shrubs; leaves large, often lobed to near midvein, lobes narrow; corolla lobes notched at apex; fruit nodding, orange-yellow, ellipsoid		1 Solanum laciniatum
+	Herbs or vines, if shrubs then leaves unlobed or lobes broad; corolla lobes entire; fruit various.		(28)
28 (27)	Inflorescences solitary or paired flowers, or unbranched, often umbellate racemes (branched in S. merrillianum); mostly shrubs or herbs.		(29)
+	Inflorescences paniculate, mostly many flowered, peduncle branched; often climbers.		(36)
29 (28)	Shrubs; leaves borne on woody stems, all entire, mostly unequal paired; style and filaments glabrous.		(30)
+	Herbs or woody vines; leaves borne on herbaceous shoots, often dentate or sinuate, all alike; style and filaments pubescent.		(32)
30 (29)	Peduncle and rachis short or obsolete, 1(-3)-flowered; pubescence of branched hairs; fruit bright orange-red		10 Solanum pseudocapsicum
+	Peduncle evident, rachis elongate, several to many flowered; pubescence of simple hairs; fruit pale, dull orange or yellow.		(31)
31 (30)	Berry often less than 1 cm in diam.; corolla less than 1 cm; anthers less than 2.5 mm; pedicel less than 1 cm; leaves glabrous, minor ones rounded at apex		3 Solanum diphyllum
+	Berry more than 1.1 cm in diam.; corolla more than 1 cm; anthers more than 2.5 mm; pedicel more than 1 cm; leaves with tufts of hairs in axils of main veins abaxially, minor ones acute at apex		4 Solanum spirale
32 (29)	Woody vines; peduncle often branched; anthers 1.5-1.7 mm		6 Solanum merrillianum
+	Herbs; peduncle unbranched; anthers various in length.		(33)
33 (32)	Fruit yellow, orange, or reddish, broadly ellipsoid; plants villous		9 Solanum villosum
+	Fruit black or rarely green, globose; plants glabrescent or puberulent.		(34)
34 (33)	Anthers less than 1.5 mm; fruiting calyx strongly reflexed; fruit less than 8 mm in diam., shiny; corolla less than 5 mm		5 Solanum americanum
+	Anthers more than 2 mm; fruiting calyx reflexed or not; fruit mostly more than 8 mm in diam., somewhat shiny or dull; corolla more than 5 mm.		(35)
35 (34)	Fruiting calyx applied to berry; berry dull black; plants copiously and evidently pubescent with erect and spreading hairs; leaves dentate or subentire, ovate to lanceolate		7 Solanum nigrum
+	Fruiting calyx reflexed from berry; berry slightly shiny, black or purple; plants with inconspicuous appressed hairs; leaves mostly subentire, ovate, rhomboid, or rounded		8 Solanum scabrum
36 (28)	Style pubescent; filaments laterally ciliate; fruit black; leaves sinuate, dentate, or entire, not lobed		6 Solanum merrillianum
+	Style and filaments glabrous; fruit red, orange, or yellow; leaves entire or lobed.		(37)
37 (36)	Leaves pinnately 5-9-parted.		(38)
+	Leaves all entire or with 1(-3) pairs of basal lobes.		(39)
38 (37)	Plants glabrous; calyx truncate with minute lobes; corolla purple or white; fruit 1-2 cm		17 Solanum seaforthianum
+	Plants pubescent; calyx with evident lobes, sinuses deltate; corolla greenish purple; fruit less than 1 cm		18 Solanum septemlobum
39 (37)	Stems and inflorescences villous with erect, many-celled hairs more than 2 mm		15 Solanum lyratum
+	Stems and inflorescences glabrous or pubescent with ± appressed hairs less than 2 mm.		(40)
40 (39)	Anthers connate; leaf base truncate or cordate.		(41)
+	Anthers free; leaf base rounded or cuneate.		(42)
41 (40)	Herbs; leaves mostly with 1 (or 2) pairs of basal lobes; seeds less than 2.5 mm; calyx lobes deltate		11 Solanum dulcamara
+	Subshrubs; leaves entire; seeds more than 2.5 mm; calyx truncate or sinuate, lobes minute, pointed		14 Solanum kitagawae
42 (40)	Leaves undulate-dentate or lobed; emergent growth with long simple hairs		13 Solanum japonense
+	Leaves all entire; emergent growth often glabrous.		(43)
43 (42)	Leaves puberulent; anthers less than 2 mm; fruit mostly less than 8 mm in diam.; seeds less than 2 mm in diam.		12 Solanum hidetaroi
+	Leaves glabrescent; anthers more than 2 mm; fruit mostly more than 8 mm in diam.; seeds more than 2 mm in diam.		16 Solanum pittosporifolium