1	"Inflorescence spatheate or subtended by a pair of opposite leafy bracts"	2
1	"Inflorescence without a spathe and without leafy bracts"	3
2	"Flowers and fruits arising from a spathe"	Commelina
2	"Flowers and fruits arising from a pair of opposite leafy bracts"	Tradescantia
3	"Inflorescences mainly axillary"	4
3	"Inflorescences all or mainly terminal"	5
4	"Axillary flowers sessile, terminal inflorescence present; fertile stamens 2-3"	Murdannia
4	"Axillary flowers pedicellate, though scarcely exceeding leaf sheath, terminal inflorescence absent; fertile stamens 6"	Cyanotis
5	"Largest leaves 60-100 mm wide; plant 1-2 m high"	Dichorisandra
5	"Largest leaves 3-60 mm wide; plant 0.1-1.2 m high"	6
6	"Fertile stamens 2-3"	7
6	"Fertile stamens 6"	10
7	"Flowers solitary at the end of each branch (Commelina calandrinioides)"	Commelina
7	"Flowers 2-many per inflorescence"	8
8	"Fruits indehiscent, blue; leaf sheath length (0.5-) 0.75-1 times internode length"	Pollia
8	"Fruits dehiscent, capsular, brown; leaf sheath less than half internode length"	9
9	"Petals white; fertile stamens grouped together, filaments glabrous"	Aneilema
9	"Petals pink to purple; fertile stamens alternating with staminodes, filaments bearded"	Murdannia
10	"Leaf margins minutely denticulate; petals white"	Callisia
10	"Leaf margins entire; petals pink or yellow"	11
11	"Leaves glabrous except for cilia near base; inflorescence paniculate; ovary 2-locular"	Floscopa
11	"Leaves hairy throughout; inflorescence spicate; ovary 3-locular"	Cartonema