1	"Calyces truncate or obscurely 10-16-toothed; capsules globose below, abruptly beaked distally; plants climbing or twining, cultivated"	Thunbergia
1	"Calyces not truncate, usually deeply 4-5-lobed; capsules oblong, ovoid, or ellipsoid, sometimes basally stipitate; plants erect or prostrate to procumbent of straggling, wild or cultivated"	2
2	"Corollas indurate, 1-lipped, the upper lip absent or rudimentary"	Blepharis
2	"Corollas not indurate, 2-lipped or subequally 5-lobed"	3
3	"Corollas deeply to shallowly 2-lipped"	4
3	"Corollas subequally 5-lobed"	11
4	"Fertile stamens 4"	5
4	"Fertile stamens 2"	7
5	"Bracts spinescent or sharply acute"	Lepidagathis
5	"Bracts neither spinescent nor sharply acute"	6
6	"Cystoliths absent; anthers monothecous, dorsally hairy; seeds on paillifor funicles; plants cultivated"	"Aphelandra {Aphelandra deppeana}"
6	"Cystoliths present; anthers dithecous, thecae equal, glabrous; seeds on hooded retinacula"	Hygrophila
7	"Staminodes present"	8
7	"Staminodes absent"	9
8	"Flowers in axillary fascicles or dense, terminal heads; bracts leafy; plants wild"	Hygrophila
8	"Flowers in terminal or axillary panicles; bracts not leafy; plants cultivated"	"Graptophyllum {Graptophyllum pictum}"
9	"Bracts partially united at the base; capsules elastically dehiscent"	Dicliptera
9	"Bracts free at the base; capsules not elastically dehiscent"	10
10	"Flowers mostly in 3-branched, lax panicles of cymes"	"Peristrophe {Peristrophe paniculata}"
10	"Flowers mostly in congested spikes of panicles, sometimes solitary or in thyrsoid cymes"	Justicia
11	"Fertile stamens 4; staminodes absent"	12
11	"Fertile stamens 2; staminodes 2"	21
12	"Both bracts and bracteoles absent"	Ruellia
12	"Bracts or bracteoles present"	13
13	"Calyces deeply 4-lobed, lobes clearly unequal, outer pair much larger than the inner; bracteoles ciliate or spinescent"	Barleria
13	"Calyces 5-lobed, lobes equal or slightly unequal; bracts neither ciliate nor spinescent"	14
14	"Bracts 4-ranked, imbricate"	15
14	"Bracts neither 4-ranked nor imbricate"	16
15	"Stamens included; anthers monothecous, sterile theca bearded throughout; capsules 4-seeded; plants cultivated"	"Crossandra {Crossandra infundibuliformis}"
15	"Stamens very slightly protruding; anthers dithecous, both thecae fertile, glabrous; capsules 6-20-seeded"	"Hemigraphis {Hemigraphis latebrosa}"
16	"Corolla lobes imbricate; thecae unequal; plants cultivated"	"Asystasia {Asystasia gangetica}"
16	"Corolla lobes twisted or contorted; thecae equal"	17
17	"Anthers bristle-tipped and sagittate at the bases; capsules 2- or 4-seeded, elastically dehiscent; plants cultivated"	"Petalidium {Petalidium barlerioides}"
17	"Anthers neither bristle-tipped nor sagittate, basally muticois; capsules 4-20-seeded, not elastically dehiscent"	18
18	"Leaves entire"	19
18	"Leaves crenate or toothed"	20
19	"Bracts inconspcuous, usually linear; capsules more than 8-seeded"	Ruellia
19	"Bracts solitary, leafy; capsules 4-8-seeded"	Strobilanthes
20	"Ovaries 8-12-seeded; flowers in sessile, congested, laxly borne clusters"	"Aechmanthera {Aechmanthera tomentosa}"
20	"Ovaries 4-8-seeded; flowers in axially or terminal, interrupted spikes, panicles, or heads"	Strobilanthes
21	"Calyces 4-lobed, lobes imbricate"	Barleria
21	"Calyces 5-lobed, lobes valvate or contorted"	22
22	"Corolla tubes uniformly cylindrical, lobes contorted or twisted; bracts small and inconspicuous"	Strobilanthes
22	"Corolla tubes cylindrical below, ventricose above; bracts large and conspicuous; plants cultivated"	"Eranthemum {Eranthemum pulchellum}"