1	"Flower radial; filaments not fused (subfamily Campanuloideae)"	2
1	"Flower bilateral; filaments, anthers fused into tube or filaments fused into tube above middle, anthers free"	7
2	"Perennial herb"	3
2	Annual	4
3	"Flowers generally 2--4+ per node; corolla cut >= 3/4 to base, lobes linear"	"Asyneuma {Asyneuma prenanthoides}"
3	"Flowers generally 1 per node; corolla cut 1/4--2/3 to base, lobes narrow- to wide-triangular"	Campanula
4	"Flowers in axils of leaf-like bracts, sessile"	5
4	"Flowers terminal, subtended, but generally not immediately so, by 1--several, generally non-leaf-like bracts, sessile or not"	6
5	"Corolla 3--5 mm, cylindric; sepals widely triangular, leaf-like"	"Heterocodon {Heterocodon rariflorum}"
5	"Corolla 5--10 mm, rotate; sepals narrowly triangular, not leaf-like"	Triodanis
6	"Fruit open by lateral pores"	Campanula
6	"Fruit open at top irregularly by tears where style falls off, within persistent sepals"	Githopsis
7	"Filaments free at base, fused above middle, anthers free; plants of dry areas (subfamily Nemacladoideae)"	Nemacladus
7	"Filaments, anthers fused; plants of wet areas (subfamily Lobelioideae)"	8
8	"Fruit open on sides by slits or irregular tears"	9
8	"Fruit open at top, within sepals, by valves"	10
9	"Pedicels 0; ovary long, narrow, +- pedicel-like; leaf lanceolate to awl-like"	Downingia
9	"Pedicels 1--4(8) mm; ovary ellipsoid, not pedicel-like; leaf linear"	"Howellia {Howellia aquatilis}"
10	"Fruit spheric; plant biennial, perennial herb"	Lobelia
10	"Fruit narrowly obconic or cylindric; plant annual"	11
11	"Corolla blue, abaxial lip with 2 low, yellow ridges; fruit narrowly obconic to cylindric"	"Porterella {Porterella carnosula}"
11	"Corolla white or 0, abaxial lip without ridges; fruit cylindric"	"Legenere {Legenere limosa}"