Brimstone tree is native to Uganda. One of the 4 tropical African species, this tree extends from West Africa south to Angola. It is a commercial timber of West Africa. In Uganda, it is confined to the tropical rain forest of Bundibugyo District west of the Ruwenzori Mountains. A sun-loving species, it regenerates abundantly in gaps and openings and is often almost gregarious in the transition zone between freshwater swamp and lowland forest. In Kampala, Nauclea diderrichii can be found within Uganda Golf course club,Makerere University among other places.

A slender forest tree to 40 m, the tall bole up to 1.5 m in diameter, usually without buttresses.

BARK: pale grey-brown with shallow longitudinal fissures.

LEAVES: oval to 15 cm long, bigger when young, often rounded at the base to a stalk about 1 cm long with a pair of distinctive leafy stipules at the base, 1.0-2.5 cm with a sharp wing at the back.

FLOWERS: small, green-whiteyellow and tubular, in solitary terminal heads (unbranched), 3 cm across, stalks only about 1 cm.

FRUIT: grey-brown and round, 3-4 cm across containing many tiny brown seeds in a white pulp. Outer skin spiky and roughly ornamented.

The wood is used for high quality goods such as furniture and cabinet making; for outdoor purposes such as railway sleepers, heavy construction, hydraulic works in contact with fresh or sea water; and in general construction for flooring, joinery, panelling etc.

The wood is used for carving mortars, sculptures and dug-out canoes, mine props, tools, drums, toys, novelties, agricultural implements, draining boards, turnery and sliced veneer.

An ornamental tree.

The wood is used for fuelwood and charcoal production.

Agroforestry: the leaves are fed to livestock, used as a shade tree crops, suitable for use in reforestation projects to restore native woodland.

The root, bark and wood are used for making a yellow dye.

The wood is used is for poles.

Edible: the pulp of the infructescence can be eaten mainly as a famine food.

Nauclea diderrichii is a good shade tree.

Medicine: leaves, and bark. http://tropical.theferns.info/viewtropical.php id=Nauclea+diderrichii, https://www.prota4u.org/database/protav8.asp g=pe&p=Nauclea+diderrichii+(De+Wild.+&+T.Durand)+Merr.