Eucalyptus urophylla is an evergreen tree up to 45 m tall, or, in unfavourable conditions, a shrub; bole straight, branchless for up to 30 m, up to 2 m in diameter; bark variable depending on moisture and altitude, usually persistent and subfibrous, smooth to shallow, close longitudinal fissures, red-brown to brown; sometimes rough, especially at the base of the trunk. Juvenile leaves subopposite, stalked, broadly lanceolate; adult leaves phyllodinous, subopposite to alternate, long stalked, broadly lanceolate, 10-15 x 5-8 cm, discolourous; lateral veins just visible. Inflorescence an axillary, simple umbelliform, condensed and reduced dichasium called a conflorescens; umbels solitary, with 5-8 flowers; peduncle somewhat flattened, 8-22 mm long. Seed small, 4-6, angular to more or less semi-circular, black. The genus Eucalyptus was described and named in 1788 by the French botanist l’Héritier. The flowers of the various Eucalyptus species are protected by an operculum, hence the generic name, which comes from the Greek words ‘eu’ (well), and ‘calyptos’ (covered). The specific epithet comes from the Greek uro- (with an elongated or tail-like appendage), and phylla (leaves).