二色桉 er se an

Trees, 12-18 m tall. Bark on trunk and larger branches dark brown, rough, fibrous, persistent; bark on smaller branches white, smooth. Branchlets slender, rounded, pendulous. Young leaves grayish white, shortly petiolate; leaf blade narrowly lanceolate to oblong, 3-4 cm. Mature leaves with a slender ca. 1 cm petiole; leaf blade narrowly lanceolate, 8-13 × ca. 1 cm, slightly twisted, thinly leathery, glands inconspicuous, secondary veins dense and at an angle of ca. 40° from midvein, intramarginal veins very close to margin. Inflorescences usually terminal, paniculate, umbels 3-8-flowered; peduncle 5-8 mm, slender, ridged. Flower buds spindle-shaped, 5-7 mm, acute at both ends. Hypanthium ovoid to obconic, 2-3 mm; stipe 2-3 mm; calyptra shorter than or as long as hypanthium. Stamens ca. 3 mm; anthers small, laterally poricidal or dehiscing by short longitudinal slits. Capsule truncately capitate ovate, 3-4 mm in diam.; disk narrow; valves 3 or 4, equaling hypanthium rim or included. Fl. Sep.

Cultivated in Guangdong and Guangxi [native to SE Australia].

The name Eucalyptus bicolor A. Cunningham ex Mitchell (J. Exped. Trop. Australia 390. 1848) has been applied to this species, but that is a nomen dubium; see Chippendale (Fl. Australia 19: 496. 1988).