1	"Roots tuberous; calyx lobes longer than the bracts and bracteoles; capsules with 24-28 seeds; plants cultivated"	"Ruellia tuberosa"
1	"Roots not tuberous; calyx lobes shorter than the bracts and bracteoles; capsules with fewer than 20 seeds"	2
2	"Leaves elliptic-ovate or ovate elliptic to deltoid; bracteols 8-10 mm long"	3
2	"Leaves linear or linear-lanceolae to linear oblong; bracteoles 1-2 cm long"	4
3	"Plants prostrate to procumbent herbs, more or less pubescent; flowers purple-violet; capsules sparsely hairy, with 16-20 seeds"	"Ruellia prostrata"
3	"Plants erect shrublets, sshoots with short whitich hairs; flowers pale to white; capsules glabrous, with 8-10 seeds"	"Ruellia patula"
4	"Plants almost glabrous, cultivated; flowers 3-3.5 cm long; inflorescences terminal, open, corymbiform panicles; capsules glabrous, with 14 seeds;"	"Ruellia brittoniana"
4	"Plants glandular pubescent; flowers about 2.5 cm long; inflorescences axillary, of solitary flowers; capsules hairy, with 8 seeds"	"Ruellia sindica"