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

37

Vernacular.— Chan bai man (´Ä¤´) (Peninsular).

Notes.— Tarenna pulchra is easily distinguished by its pendulous inflorescences with quite large showy flowers and its glabrous leaves.

  • 19.

    Tarenna quocensis Pit. in H.Lecomte, Fl. Indo-Chine 3(2): 221. 1923; Craib, Fl. Siam. 2:

  • 94.

    1932; P.H. Hô, Câyco Viêtnam 3, 1: 229, fig. 7678. 1993 [as T. quocense Pierre ex Pit.].

Type: Cambodia, May 1874, Pierre 3179 (holotype P!). Fig. 4.

KEY TO VARIETIES

  • 1.

    Leaves 3.5–5.5 cm wide, with 9-13 pairs of lateral nerves. Corolla lobes not ciliate a. var. quocensis

  • 1.

    Leaves 4–12 cm wide, with 7-9 pairs of lateral nerves. Corolla lobes ciliate with white hairs

    • b.

      var. laotica

19a. var. quocensis

Thailand.— NORTHEASTERN: Nong Khai [Bueng Kan, Nong Waeng, 16 Nov. 1966, Smitinand 10067 (BKF, K, L)]; EASTERN: Nakhon Ratchasima [Hui Reng, 19 Dec. 1929, Kerr 17600 (BM); Katok, 30 Dec. 1925, Kerr 8166 (AAU, BK, BM, K); Khao Khieo, 8 March 1964, Hansen, Seidenfaden & Smitinand 11374 (BKF, K, L), 28 Feb. 1968, Santisuk 7 (BKF), 23 March 1968, Santisuk 72 (BKF), 28 Dec. 1969, van Beusekom & Chaloenpol 1862 (AAU, BKF), 15 March 1968, van Beusekom & Phengklai 56 (K); KhaoYai National Park, Pha Diew Dai, 22 May 2005, Kesonbua 132 (KKU) & 173 (KKU), 13 March 2005, Kesonbua 175 (KKU) & 177 (KKU); Pak Thong Chai, 3 Nov. 1970, Chansenphol, Larsen & Warncke 4467 (K, P) & 4486 (AAU, K), 25 Nov. 1966, Dumrongsak 426 (BKF), 18 Jan. 1978, Dumrongsak 506 (BKF), 16 May 1968, Dumrongsak 571 (BKF); Sakaerat Experimental Research Station, 5 Dec. 1984, Fukuoka & Ito T-34737 (BKF)]; CENTRAL: Nakhon Nayok [Hin Dang, 28 Feb. 2001, Maxwell 01-154 (CMU); Salika Waterfall, 24 Dec. 1966, Sutheesorn 1951 (BK)]; SOUTHEASTERN: Prachin Buri [Krabin Buri, 25 Dec. 1924, Kerr 9763 (BK, BM, K); Ban Kong, 8 Nov. 1930, Kerr 19805 (BK, BM, TCD), 8 Nov. 1930, Marcan 2844 (BM, K)]; Chanthaburi [Khao Sabap, 6 July 1927, Put 914 (BM)]; Trat [Huai Reng, 19 Dec. 1929, Kerr 17600 (BK, BM, K); Khao Kuap, 21 May 1930, Put 2903 (BK, BM, K)].

Distribution.— Laos, Cambodia, Vietnam.

Ecology.— Common in evergreen forest; altitude to 500 m. Flowering and fruiting periods: December to March.

Vernacular.—Ya yuan hin (¥µ¥ª®·) (Trat).

Notes.— Tarenna quocensis var. quocensis is similar to T. wallichii but differs in its flower and fruit characters, such as calyx lobe shape and in having larger fruits crowned by long persistent calyx lobes. The two taxa have a vicariant distribution; T. wallichii is confined to southern Thailand while T. quocensis var. quocensis is widespread in northeastern, central and southeastern Thailand.

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