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A CHECKLIST OF THE GENUS TARENNA GAERTN. (RUBIACEAE) IN THAILAND (W. KESONBUA & P. CHANTARANOTHAI)

21

  • 3.

    Corolla lobes oblong; corolla bud truncate, without apiculate apex

    • 5.

      Both surfaces of leaf glabrous or sparsely covered with short hairy on the lower surface

      • 6.

        Pedicel of the center flower sessile or short, to 2 mm long

        • 7.

          Inflorescence more than 2.5 cm long; central first order axes more than 5 mm long

          • 8.

            Calyx lobes triangular or filiform, with acute apex

            • 9.

              Leaves oblong or lanceolate, the length more than 3 times the width

              • 10.

                Inflorescences sparsely covered with short hairs; calyx lobes triangular, shorter than the ovary

                • 11.

                  Leaves membranous; fruit crowned by persistent calyx

                  • 12.

                    Calyx lobes narrowly triangular; corolla bud acute; northeastern and southeastern

Thailand

19. T. quocensis

12. Calyx lobes broadly triangular; corolla bud truncate; peninsular Thailand only

11. Leaves coriaceous; fruit with calyx scar

  • 24.

    T. wallichii

  • 23.

    T. vanprukii

10. Inflorescences densely covered with short hairs; calyx lobes filiform, as long as or

longer than the ovary

        • 9.

          Leaves elliptic, the length less than 3 times the width

      • 8.

        Calyx lobes ovate, with rounded apex

        • 13.

          Small tree; leaves elliptic, more than 5 cm wide

        • 13.

          Shrubs; leaves lanceolate, less than 5 cm wide

    • 7.

      Inflorescences to 2.5 cm long; central first order axes to 5 mm long

  • 6.

    Pedicel of the center flower more than 2 mm long

    • 14.

      Both surfaces of leaf grabrous

    • 15.

      Leaves elliptic or obovate; calyx lobes ovate, with rounded ap

    • 15.

      Leaves ovate; calyx lobes broadly triangular, with acute apex

  • 14.

    Lower leaf surface puberulous

ex

      • 22.

        T. valida

    • 4.

      T. collinsae

    • 11.

      T. hoaensis

      • 20.

        T. sakae

  • 14.

    T. membranacea

  • 5.

    T. pauciflora

  • 1.

    T. adangensis

  • 6.

    T. curtisii

  • 5.

    Upper leaf surface glabrous or softly cinereo-pubescent

    • 16.

      Leaves less than 5 cm wide;

hairy

calyx

on midrib only, lower leaf surface densely pubescent or

lobes

broadly

triangular,

with

acute

apices

3.

T.

cinerea

    • 16.

      Leaves more than 5 cm wide; calyx lobes ovate, with rounded

  • 2.

    Locule a few multi-ovulate

  • 17.

    Calyx lobes as long as or longer than the ovary, locule 3-ovulate

8. T. harmandiana

18. Lower leaf surface with sparse or microscopic hairs; corolla bud truncate, without apiculate

apex

2. T. angustifolia

  • 18.

    Lower leaf surface puberulous; corolla bud stellate, with apiculate apex

  • 17.

    Calyx lobes shorter than the ovary; locule multi-ovulate

17. T. puberula

19. Trees; leaves obovate; corolla tubes less than 1 cm long, style-stigma complex less than 2

cm long

5. T. costata

19. Large shrubs; leaves elliptic; corolla tubes more than 1.2 cm long, style-stigma complex

more than 3 cm long 1. Mature inflorescence pendulous, peduncle curved

7. T. fragrans

20. Leaves elliptic, lanceolate or oblanceolate, glabrous or hairy on the lower surface only; pedicel of

the center flower more than 3 mm long

  • 21.

    Upper leaf surface glabrous, lower leaf surface hairy

    • 22.

      Lower leaf surface hispidulous

    • 23.

      Leaves lanceolate; calyx lobes triangular, shorter than the ovary

9. T. hirsuta

23. Leaves oblanceolate; calyx lobes filiform, as long as or longer than the ovary

  • 22.

    Lower leaf surface densely pubescent

  • 21.

    Both surfaces of leaf glabrous

  • 10.

    T. hispidula

  • 13.

    T. longifolia

  • 18.

    T. pulchra

  • 20.

    Leaves ovate, hairy on both surfaces; pedicel of the center flower less than 3 mm long or sessile

  • 16.

    T. pilosa

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