1	"Corollas 45 mm long or longer"	2
1	"Corollas up to about 35 mm long"	5
2	"Plants shrubs less than 15 cm tall; bracteoles linear-lanceolate; corollas white with tubes 8-95 mm long"	"Ruellia galactophylla"
2	"Plants up to 200 cm tall; bracteoles usually ovate to orbicular; corollas red or white with tubes up to 60 mm long"	3
3	"Corollas red, tubes funnel-shaped, up to 35 mm long"	"Ruellia carnea"
3	"Corollas white, tubes cylindrical, 40-60 mm long"	4
4	"Calyx lobes linear, free from each other"	"Ruellia discifolia"
4	"Calyx lobes oblanceolate, partly connate"	"Ruellia nocturna"
5	"Leaves and bracts linear to lanceolate; old stems pale grey"	"Ruellia linearibracterolata"
5	"Leaves and bracts lanceolate to broadly ovate; stems green to greyish green"	6
6	"Capsules glabrous, relatively sort of wide"	"Ruellia patula"
6	"Capsules finely pubescent with appressed hairs, slender"	"Ruellia prostrata"