Hopea mengarawan Miq.

Merawan (Hopea mengarawan) is a giant tree up to 60 meters tall of the Dipterocarpaceae family, native to Singapore, Kalimantan, Sumatra, and Malaysia, now classified as 'Critically Endangered' by the IUCN due to continued wild harvesting. Its resin (damar) has long been used to caulk boats, as an adhesive, and for traditional torches. Its oligomeric resveratrol content holds great potential as an antioxidant that is still being researched.

This plant is usually found on ridges and hill slopes with poor sandy to clay soil in the wild, also on ultrabasic soil. This tree has a wide canopy in forests, growing locally, scattered or sometimes in groups in lowlands, often swampy or periodically flooded, and also in low hills up to elevations of 500 m above sea level.

• Root a taproot, brown in color.
• Stem unbranched up to 25 m, sometimes more, with a diameter of up to 90 cm and clearly buttressed. It produces good quality damar resin.
• Leaves alternately petioled with rough, oblong spear-shaped blades, 6-12 by 2.5-5 cm in size, brownish underneath and golden brown on top when dry.
• Flowers appear at each stem tip up to 3 cm long and produce up to 6 yellowish-white flowers about 5 mm wide.

Merawan is propagated using seed.

Oligomeric resveratrols, namely diptoindonesin D, balanocarpol, ampelopsin A, hopeafuran, heimiol A, parviflorol, a-viniferin, isohopeaphenol, and vaticanol B.

Has potential as an antioxidant, antibacterial, anticancer, antihepatotoxic, anti-HIV agent.

• Wash the bark thoroughly. Separate the bark from the inner stem using a knife.
• Dry by sun-drying for several days, turning the bark position daily.
• Once dry, grind into powder then store in an airtight container.

Damar cermin (Indonesia); Damar mata kucing (Indonesia); Tengerawan (Indonesia); Tengerawan (Sumatra); Tekan lampung (Borneo); Wapei (West Irian).