1	"Corolla actinomorphic; anthers free"	Wahlenbergia
1	"Corolla zygomorphic; anthers united"	2
2	"Corolla limbs irregular, tubes slit almost to base; anthers inserted at base of tube"	Lobelia
2	"Corolla limbs almost regular, tubes not slit to base; anthers inserted near top of tube"	3
3	"Corolla tube 60-110 mm long, corolla lobes 17-25 mm long"	Hippobroma
3	"Corolla tube up to 35 mm long, corolla lobes up to 17 mm long"	Isotoma