1	"Stamens 4, a staminode present or absent"	Cyphanthera
1	"Stamens 5, all functional"	2
2	"Fruit a capsule"	3
2	"Fruit a berry"	5
3	"Corolla-tube exceeding the calyx by c. 5 mm; capsule circumscissile, opening by an apical lid"	"Hyoscyamus (see note after family description)"
3	"Corolla-tube exceeding the calyx by much more than 5 mm; capsule opening lengthwise by 2 or 4 valves"	4
4	"Flowers solitary; calyx tubular, base only persistent in fruit; capsule more than 2 cm long, prickly, 4-valved; seeds 2–4 mm long"	Datura
4	"Flowers in panicles; calyx campanulate, wholly persistent in fruit; capsule less than 2 cm long, smooth, 2-valved; seeds less than 1 mm long"	Nicotiana
5	"Berry enclosed by calyx; calyx much enlarged and papery in fruit"	6
5	"Berry fully exposed; calyx not or only slightly enlarged in fruit"	7
6	"Flowers blue; ovary 3–5-celled; fruiting calyx deeply 5-partite; plant annual"	"Nicandra {Nicandra physalodes}"
6	"Flowers white or yellow; ovary 2-celled; fruiting calyx shortly 5-toothed; plant perennial"	Physalis
7	"Corolla rotate, stellate, campanulate or urn-shaped"	8
7	"Corolla narrowly funnel-shaped or tubular"	9
8	"Flowers solitary, distant, white; anthers dorsifixed, opening by longitudinal slits, shorter than filaments, not cohering around style"	"Salpichroa {Salpichroa origanifolia}"
8	"Flowers mostly in axillary clusters, often purplish; anthers basifixed, opening by terminal pores or short slits, longer than filaments, cohering around style"	Solanum
9	"Leaves mostly more than 5 cm long, not in clusters, not fleshy; flowers numerous in panicles; corolla more than 15 mm long, reddish or yellowish"	Cestrum
9	"Leaves mostly less than 5 cm long, often clustered, sometimes fleshy; flowers solitary or in clusters of 2–4; corolla to c. 10 mm long, white or pink to purplish"	Lycium