eriosema heterophyllum

Alnus formosana, the Formosan alder, is a species of alder endemic to Taiwan. It is a medium-sized tree, up to 20 metres (66 ft) in height.

The formosan alder is a trees up to 20 meters in height with dark gray-brown bark. The petiole is 1.2-2.2 cm, slender; leaves elliptic or oblong-lanceolate, rarely ovate-oblong, 6-12 × 2–5 cm, hairy in the axils of lateral veins beneath, almost hairless above, rounded or broadly cuneate base, irregularly minutely serrated margin, acuminate or acute apex; lateral ...