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THAI FOREST BULLETIN (BOTANY) 36

KEY TO THE SPECIES (B) (based mainly on vegetative and fruit characters)

1. Lower leaf surface glabrous or with hairy domatia in the nerve axils 2. Lateral nerves up to 7 pairs 3. Leaf apex acuminate; fruiting inflorescence more than 2.5 cm long 4. Leaves ovate; calyx lobes broadly triangular, with acute apex 4. Leaves elliptic or obovate; calyx lobes ovate, with rounded apex 3. Leaf apex acute; fruiting inflorescence to 2.5 cm long 2. Lateral nerves more than 7 pairs 5. Leaves elliptic, the length less than 3 times the width 6. Leaves less than 5 cm wide 6. Leaves more than 5 cm wide 5. Leaves oblong or lanceolate, the length more than 3 times the width 7. Fruiting inflorescence erect, peduncle straight 8. Leaves membranous; fruit crowned by persistent calyx 9. Fruits more than 7.5 mm wide, persistent calyx lobes narrowly triangular; 1. T. adangensis 15. T. pauciflora 14. T. membranacea 4. T. collinsae 11. T. hoaensis

northeastern and southeastern Thailand

19. T. quocensis

9. Fruits less than 7.5 mm wide, persistent calyx lobes broadly triangular; peninsular Thailand

only

      • 8.

        Leaves coriaceous; fruit with calyx scar

      • 7.

        Fruiting inflorescence pendulous, peduncle curved

  • 1.

    Lower leaf surface hairy

    • 10.

      Fruit with 1–2 seeds

    • 24.

      T. wallichii

  • 23.

    T. vanprukii

    • 18.

      T. pulchra

  • 11.

    Leaves elliptic or lanceolate; upper leaf surface glabrous or hairy on the mid-vein only

    • 12.

      Lower leaf surface hispidulous or sparsely covered with short hairs

      • 13.

        Fruiting inflorescence erect, peduncle straight

        • 14.

          Lateral nerves more than 7 pairs

          • 15.

            Lateral nerves inconspicuous; peduncle more than 1 cm long, densely hairy

              • 22.

                T. valida

          • 15.

            Lateral nerves conspicuous; peduncle to 1 cm long, glabrous or sparsely hairy

              • 20.

                T. sakae

        • 14.

          Lateral nerves less than 7 pairs

          • 16.

            Leaves less than 4 cm wide

            • 17.

              Leaf apex acuminate; fruit with persistent filiform calyx; calyx lobes longer

than the ovary

12. T. insularis

17. Leaf apex acute; fruit with persistent broadly triangular calyx lobes; calyx lobes

shorter than the ovary

  • 16.

    Leaves more than 4 cm wide

  • 13.

    Fruiting inflorescence pendulous, peduncle curved

  • 6.

    T. curtisii

  • 21.

    T. stellulata

18. Leaves oblanceolate; calyx lobes filiform, as long as or longer than the ovary 10. T. hispidula 18. Leaves lanceolate; calyx lobes broadly triangular, shorter than the ovary 9. T. hirsuta 12. Lower leaf surface velvety or pubescent 19. Leaves elliptic; fruiting infloresence erect, peduncle straight 20. Leaves less than 5 cm wide 20. Leaves more than 5 cm wide 19. Leaves oblanceolate; fruiting infloresence pendulous, peduncle curve 11. Leaves ovate; upper leaf surface hairy 10. Fruit with 3–numerous seeds 21. Fruit with 3–6 seeds 22. Leaves coriaceous, shiny; lower leaf surface with sparse or microscopic hairs; petiole to 3. T. cinerea 8. T. harmandiana 13. T. longifolia 16. T. pilosa

1 cm long

2. T. angustifolia

  • 22.

    Leaves membranous; lower leaf surface hispidulous; petiole more than 1 cm long

    • 17.

      T. puberula

  • 21.

    Fruit with numerous seeds

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