| Distribution | S. assamica, in the wide sense, occurs in northwest India, Yunna, Burma, the Malay Peninsula, Sumatra, Borneo, the Philippines, Sulawesi, and Maluku. The various geographical races are recognized as distinct botanical forms, that from the Malay Peninsula and Sumatra being the form globifera. This form occurs mainly in the northern peninsula. It has been found on the Langkawi Islands, in Perlis, Kedah, northern Perak, Kelantan, and Terengganu. It has been recorded as far south as Cikus Forest Reserve in southern Perak and the Bentong district of Pahang. It appeared to be quite common in the north, but that is all that can be said concerning its abundance. It favors low-lying land, often occurring in the vicinity of streams, but in Bubu Forest Reserve in Perak it has been observed in valleys above 300 m altitude, and near Temerloh in Pahang collections have been made at 500 m. Now critically endangered except in Langkawi.
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| Herbarium Characteristics | Oval-elliptic or obovate, acuminate, about 7 X 3 cm, about 17-nerved, drying yellowish brown in color, smooth above, minutely stellate-hairy and sometimes glaucescent on the undersurface; petiole about 6 mm long.
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