New account of Horsfieldia 3 191 Ecology. Lowland forest: on sandy loam soil, sandy ridge in Shorea laevifolia forest: 0-800 m. Flowers and fruits throughout the year. NOTES 1. Fieldnotes. Bark smooth, undulately fissured: inner bark c. 10 mm thick, laminated, reddish-brown or yellow-brown: wood whitish or pale brown, or reddish. Flowers yellow, the males very fragrant. 2. Specimens ot the present new subspecies were formerly determined by Sinclair as H. sucosa var. microcarpa, a name later on ( 1975. p. 20) published as H. bracteosa var. microcarya Sinclair. Other specimens belonging to Sinclair's var. microcarya, incl. the type, are presently referred to a new species H. pallidicaula. 3. H. sucosa is vegetatively very similar to H. pallidicaula and H. srerilis. the two being markedly different in the male flowers: these have a differently built androecium. and the pedicels are inarticulate at the base. 4. It seems as if the distributional area excludes that of the related and resembling species H. pallidicaula. 49. Horsfieldia pallidicaula de Wilde, sp. now Fig. 1B(49) Cortex ramulorum pallidus. cinereus. non fuscobrunneus. Folia disticho vel sparsa. subtus nonpunctata. Perianthia mascula subglobosa. 1.5-2 mm diam.. 3-vel 4-valvatis: pedicelli graciles. 1-2 mm longi. basi non-articulati. Fructus late ellipsoidei. in sicco nigrescentes. perianthio persistente. — Type: Jacobs 5413 (L: iso: K: SAR. G. US. CANB. B. S. SING. n.v. ). Tree 7-20 m. Twigs terete, neither lined nor ridged, towards the apex 2-10 mm diam.. pale, whitish or greyish brown, contrasting with the blackish colour of the dry petioles (or petioles often greyish in the lower half), early glabrescent. tomentum with rusty or greybrown hairs 0.1-0.3 mm long: the bark lower down finely striate or not. slightly flaking or not. lenticels generally inconspicuous or absent. Leaves either in 2. 3 or 5 rows, membranous, oblong to oblong-lanceolate, broadest at or above the middle. 10-30 x 4-9.5 cm. base long-attenuate, tip acute-acuminate: upper surface drying brown to blackish-brown, lower surface drying brown to grey-brown, without larger blackish dots, early glabrescent: midrib flat or slightly raised above, glabrous: nerves 10-18 pairs, slender above, flat or slightly raised, lateral arches not distinct: tertiary venation forming a lax network, indistinct above: petioles 10-25 x 1.5-3 mm. early glabrescent: leaf bud rather stout to slender. 7-10 x 2-4 mm. covered by brown-grey rusty tomentum of hairs (0.1-) 0.2(-0.3) mm long. Inflorescences situated generally behind the leaves, glabrescent. tomentum weak, with hairs 0.1-0.2 mm: in cf : (2 or) 3 times ramified, manyflowered, 3-9 x 2.5-7 cm. common peduncle up to 7 mm long (hence inflorescences often also ramified from near the base), the flowers more or less in clusters of 2-4: 9 inflorescences rather few-flowered. 1-3 cm long: bracts lanceolate, acute, finch pubescent. 1-3 mm long, caducous: perianths 3-or 4-valved. in 9 sometimes 2-valved. glabrous, pedicel glabrous, at base inarticulate. Male perianth globose or broadly obovoid. 1.5-2.0 (-2.2) mm diam.. top (broadly) rounded, base rounded to short-attenuate: pedicel 1-2 mm. slender: perianth at anthesis cleft to c. Vs to nearly V^-way deep, not or but slightly collapsing on drying, valves 0.2-0.3 mm thick. Androecium short-ellipsoid to somewhat depressed-globose. 0.8-1.2 x 0.8-1.2 mm. top rounded, circular in cross-section: anthers 8-10. completely sessile (i.e.. free apices 0-0.1 mm long only), incurved towards the apex of the androecium: column