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SCAPHIUM AFFINE (MAST.) PIERRE (STERCULIACEAE) NEW FOR THAILAND (P. PHONSENA & P. WILKIE)

63

AMENDED KEY TO THE SPECIES OF SCAPHIUM IN THAILAND

1. Leaves heart-shaped, base deeply cordate. Seed pubescent

1. S. linearicarpum

1. Leaves elliptic to ovate-oblong, base subcordate or cuneate to truncate. Seed glabrous

  • 2.

    Flower 18–23 mm diam., red with yellow at apex. Seed subglobose to globose

  • 2.

    Flower 5–7 mm diam., greenish white. Seed ellipsoid

  • 3.

    S. scaphigerum

  • 2.

    S. affine

1. Scaphium linearicarpum (Mast.) Pierre, Fl. Forest. Cochinch. 3: sub. tab. 193–195, in text. 1889; Ridl., Fl. Mal. Pen. 1: 275; Kosterm., J. Sci. Res. (Jakarta) 2(1): 21. 1953; Phengklai, Fl. Thailand 7(3): 621. 2001.— Sterculia linearicarpa Mast., Fl. Brit. Ind. 1: 360. 1874. For description and distribution see Phengklai (l.c.).

2. Scaphium affine (Mast.) Pierre, Fl. Forest. Cochinch. 13: 193. 1889. –– Sterculia affinis Mast. in Hook.f., Fl. Brit. Ind. 1 (2): 361. 1874. Type: Malaysia, “Malacca”, Maingay 1856 Kew distribution 225 (lectotype K, here designated). Scaphium lychnophorum (Hance) Pierre, Fl. Forest. Cochinch. 13: pl. 193. 1889., as ‘ lichnophorum’. –– Sterculia lychnophora Hance, J. Bot. (new series) 5: 243. 1876. Type: Cambodia, mountains of Camchay, province of Kamput, Pierre s.n. April 1874 (Hance 19219), (lectotype K, here designated; probable isotype P (Pierre 3781,April 1874). Fig. 1.

Tree, up to 40 m high, up to 260 cm girth above buttresses; bole straight; buttresses up to 2 m; bark pale greyish-brown, shallowly fissured, inner bark pale orangish-brown; twigs stout, glabrescent, with prominently raised large leaf scars; young shoots reddish- brown, pubescent. Stipules subulate, rusty hairy, caducous. Leaves ovate to ovate-oblong, 13–22 by 7–10 cm, base subcordate or cuneate to truncate, apex acute or acuminate, subcoriaceous, glabrous; nerves 4–7(–8) pairs, 3 or 5 nerves at base, scalariform veins prominent on both surfaces; young leaves on saplings 3–5-lobed. Petioles 5–21 cm long, swollen at both ends. Inflorescences panicled, axillary and terminal, dense, (3–)14–20 cm long, erect, pubescent. Perianth campanulate, 5-lobed, 5–7 mm diam., pubescent, greenish- white, faintly-scented. Stamens 10–13, in a whorl; anthers 2-celled, yellow. Pistil with 2 carpels, red. Androgynophore 2–4 mm, erect. Fruit a large follicle, 18–20 by 5–6 cm, soon dehiscing, boat-shaped and membranous, glabrous or hairy near base. Seeds ellipsoid, 3– 3.5 by 1.4–2 cm, glabrous. Cotyledons shortly stiped, elliptic, thin, leaflike, green, 4.1–5.5 by 4–6.5 by 0.3–0.4 cm.

Thailand.–– EASTERN: Ubon Ratchathani [specimen not located]; SOUTHEASTERN: Chachoengsao [Khao Ang Ruenai WS., Lum Changwat, 21 Dec. 2005, Phonsena 4754 (BKF, Herbarium of Khao Hin Son Botanic Garden); 20 Feb. 2007, Phonsena & Banchong 5336 (BK, BKF, L, Herbarium of Suan Luang Rama IX, Herbarium of Khao Hin Son Botanic Garden: with spirit collection)]; Chon Buri [specimen not located]; Rayong [specimen not located]; Chanthaburi [Khao Khitchakut NP., 15 April 1925, Nai Noe 81 (BK); Khao Khitchakut NP., HQ., 5April 2005, Phonsena et al. 4529 (BKF, Herbarium of Khao Hin Son Botanic Garden); 20April 2005, Phonsena 4546 (BKF, Herbarium of Khao Hin Son Botanic Garden); Khao Khitchakut NP., HQ., 23 Jan. 2007, Phonsena et al. 5329 (BK, BKF, L, Herbarium of Suan Luang Rama IX, Herbarium of Khao Hin Son Botanic Garden: with spirit collection)]; Trat [Bo Rai, 25 Nov. 1924, A.F.G. Kerr 9445A (BK), 9445B (BK), 9445C (BK);

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