1	Anthers 0.8–2.1 mm long	2
–	Anthers 2.5–5.0 mm long	3
2	Calyx lobes completely enclosing the corolla in bud; inflorescences with flowers clustered near the tips; leaf base truncate	Solanum sarrachoides
–	Calyx lobes not completely enclosing the corolla in bud; inflorescences with flowers spaced 1–3 mm apart along the rachis; leaf base rounded to cuneate	Solanum nitidibaccatum
3	Anthers 2.5–3.2(-3.8) mm long; calyx (tube and/or lobes) covering 0–20% of the berry in fully mature fruits	4
–	Anthers (3.8-)4.0–5.0 mm long; calyx (tube and/or lobes) covering at least 50% of the berry in fully mature fruits	5
4	Calyx with spreading trichomes 1.5–3.5 mm long; anthers ellipsoid, rectangular in outline; fruiting pedicels spaced (0-)1–2 mm apart	Solanum michaelis
–	Calyx with spreading trichomes 0.5–1.0 mm long; anthers conical, triangular in outline; fruiting pedicels spaced 0–1 mm apart	Solanum woodii
5	Calyx lobes 2.5–3.0 mm long in flower; fruiting calyx not markedly enlarged and inflated, the calyx tube slightly growing but neither tube nor lobes accrescent; fruit often slightly visible or calyx tube reaching just beyond the top of the berry	Solanum atriplicifolium
–	Calyx lobes 3.5–5(-7) mm long in flower; fruiting calyx markedly enlarged and inflated, both calyx tube and lobes accrescent; fruit fully covered by calyx tube	Solanum tweedianum