Tree 6-25 m. Leaves membranous or chartaceous, ± bullate, elliptic-oblong to oblong-oblanceolate, 12-40 by 5-20 cm, base ± attenuate to subcordate, apex acute or acute-acuminate; Inflorescences with dense yellow-rusty hairs, 1.5-3 mm long; Fruits 2-10 per infructescence, ± clustered, obovoid-ellipsoid, apex rounded, 1-1.4 by 0.8-1.1 cm, glabrous;
Asia-Tropical: Borneo present (Brunei present, Sabah present, Sarawak present); Malaya (Peninsular Malaysia present, Singapore present); Sumatera (Sumatera present), E Kalimantan present, Johore present, Pahang present, Palembang present, Riau present
Malesia: Sumatra (Palembang; Riau, not seen), Peninsular Malaysia (Pahang, Johore), Singapore, Borneo (Sarawak, Brunei, Sabah, E Kalimantan).
The perianths of H. grandis are usually 4-, less frequently 3-lobed. There are 16-20 thecae which are tightly appressed and difficult to count.