Aporosa arborea Muell Arg

[From Greek, aporos = difficult and from Latin, arbor = tree]

Physical description: It is a tree which grows to a height of 25 m in the lowland rainforests of Thailand, the Malay Peninsula, Sumatra, West Java and Borneo. The bark is smooth and greyish-brown. The stems are terete, smooth, and sparsely lenticelled. Leaves: simple, spiral and stipulate.The stipules are caducous. The petiole is 3.4cm-3cm long and obscurely channeled above and curved at both ends. The blade is oblong-elliptic to obovate, 13.5cm-35cm x 4.5cm-15cm, and papery. The base is round to acute, and basal glands are absent. The margin is slightly undulate, the marginal glands are small. The apex is acuminate to cuspidate. The midrib at the base is sparsely puberulous above. The midrib and the nerves are sparsely puberulous underneath. A few disc-like glands are present along the margin. The nervations are slightly sunken above, and raised underneath. The blade shows 10-12 pairs of secondary nerves as well as scalariform tertiary nerves. The inflorescences develop from below the leaves or from the stems. The male flowers are 0.4 mm-0.8 mm long and yellow. The flower pedicels are indistinct. The calyx consists of 4 or 5 sepals which are obovate and 0.5 mm-0.8 mm long. The andrecium comprises of a pair of stamens which are slightly exserted and 0.3mm-0.4mm long. The anthers are 0.2 mm long. The female flowers are 2 mm-5 mm long and attached to 1.5 mm-3 mm long pedicels. The calyx comprises of 5 sepals which are ovate, patent to slightly reflexed, and 0.6mm-1 mm long. The ovary is globose, 3-4-locular and sparsely puberulous, and develops at the apex 3 stigmas of 0.7 mm-1.5 mm length, which are bifid. The fruits are ellipsoid to globose, red-yellow and 1.7 cm x 1.2cm-1.5cm x 7 mm and show vestigial stigmas at the apex and vestigial sepals at the base. The fruits contain 1-3 seeds embedded in a red aril (Fig. 197).

Synonymy: Leiocarpus arboreus Bl., Leiocarpus arborescens Hassk., Aporosa arborescens (Hassk.) Mull. Arg. Daphniphyllum kingii Hook. f., Baccaurea forbesii Pax & K.Hoffm.

Common names: Plueak khao (Thai).

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