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1. Climbing plants; calyx minute, annular or 10-15 toothed………21. Thunbergia
1. Prostrate or erect plants; calyx usually deeply divided:
2. Corlla segments imbricate in buds; fertile stamens 2 or 4:
3. Fertile stamens 2:
4. Seeds without retinacula………………………………12. Nelsonia
4. Seeds with retinacula:
5. Ovary cells 6-10 ovules…………………………………16. Phologacanthus
5. Ovary cells 2-ovules:
6. Corolla lobes sub equal, not distinctly 2-lipped………………6. Eranthemum
6. Corolla distinctly 2-lipped:
7. Flowers in lax cymes or panicles; anther cell without a basal spur:
8. Flowers purplish-lilac; bracts mucroante, clustered………….5. Dicliptera
8. Flowers pink-purple; bracts in opposite pairs, valvate,
not mucronate……………………………………………………14. Peristrophe
7. Flowers in dense spikes; anther cells with a basal spur at the base:
9. Bracts dimorphic………………………………………..……19. Rungia
9. Bracts not dimorphic:
10. Corolla white, more than 1.5 cm long………………………1. Adhatoda
10. Corolla pinkish-purple, less than 1 cm long…………………10. Justicia
3. Fertile stamens 4:
11. Calyx segments 5; anther cells basally spurred………………3. Asystasia
11. Calyx segments 4 or 5; anther cells not spurred:
12. Spikes not aggregated; 2 stamens exserted, 2 rudimentary……4. Barleria
12. Spikes aggregated in globose heads; stamens
all fertile, included……………………………………………..11. Lepidagathis
2. Corolla segments contracted in buds; fertile stamens 4:
13. Ovary cells 3-7 ovuled; cells of the capsules 3 or more seeded:
14. Corolla distinctly 2-lipped……………………………………9. Hygrophila
14. Corolla not distinctly 2-lipped, subequally 5-libed:
15. Flowers in capitates spikes……………………………………8. Hemigraphis
15. Flowers in clusters, combined into a panicle…………………2. Aechmanthera
13. Ovary cells 1-2 ovuled; cells of the capsules 1-2 seeded:
16. Anther cells basally spured……………………………………15. Petalidium
16. Anther cells not spured:
17. Leaves sessile with ampexicaule base; flowers in dense spikes…13. Perilepta
17. Leaves petioled not ampexicaule; flowers in capitates or elongated spikes:
18. Flowers in capitate spikes:
19. Bracts caducous, not leaf like…………………………..7. Goldfussia
19. Bracts persistent leaf like……………………………20. Strobilanthes
18. Flowers in elongated racemes:
20. Bracts persistent; corolla purplish……………………17. Pseudoaechmanthera
20. Bracts caducous; corolla blue-purple……………….. 18. Pteracanthus

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