Merrillia

This species is a tree often reaching up to 20 meters tall, sometimes approaching 30 meters.[3] One report from 1932 mentions a specimen collected from a tree 33.6 meters tall. If the report is valid it would be the largest tree of the Aurantioideae. The trunk has a light, flaking bark. The leaves can exceed 20 centimeters in length,[5] and each is made up of 5 to 13 leaflets up to about 10 centimeters long, the basal ones smaller than the others. They are thin, bright green, and somewhat lance-shaped with triangular bases.[5] The flowers are solitary, paired,[3] or borne in panicles.[5] They are white to yellow-green and trumpet-shaped with petals up to 1.8 centimeters long. The oblong fruit is up to 11 centimeters long by 7.5 wide.[3] It has a warty peel over a centimeter thick. It is green, turning yellow with maturity. The fruit contains a tasteless, fibrous, olive-green pulp.[5]

The native habitat of the tree includes primary and secondary tropical forest.[3]

The species has been noted for its wood, which is bright yellow with dark brown streaks. It is a hard wood used historically in Malaysia to make walking sticks and kris handles. It was also good for making furniture and boxes. The species was too rare to provide a supply of commercial timber.[5]

Several coumarins have been isolated from the roots, including one named merrillin.[6] The alkaloid yuehchukene has been found in the bark; it is a compound well known from the related genus Murraya.[7]