Horsfieldia laticostata
Content
Description
Tree 12-35 m.
Leaves thinly to thickly coriaceous, (obovate-)oblong, (15-)20-33 by 6-12 cm, base attenuate, apex (short-)acute-acuminate;
Inflorescences below the leaves, with sparse hairs 0.2-0.4 mm long;
Fruits 1-4 per infructescence, ellipsoid, 2.8-4 by 2.2-2.5 cm, glabrous, with or without warts or lenticels;
Distribution
Asia-Tropical: Borneo present (Sabah present, Sarawak present), C & NE Kalimantan present
Malesia: Borneo (Sarawak, Sabah, C & NE Kalimantan).
Taxonomy
Horsfieldia laticostata is closely related to the variable H. polyspherula, especially to the varieties sumatrana and maxima. The species seems confined to forests on poor soils, peaty and sandy grounds. It is characterized by stout twigs, large coriaceous leaves with the midrib very broad and flat at the transition to the petiole, the usually stout, broad petioles, fruits of moderate size (30-40 mm long), and large, stout, male inflorescences. The male flowers (perianth and androecium) are very similar to those of H. polyspherula.