Alnus formosana
Alnus formosana, the Formosan alder, is a species of alder endemic to Taiwan. It is a medium-sized tree, up to in height.Description
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 veins 6 or 7 on each side of the midrib. It has one female inflorescence, or 2-4 in a cluster, ellipsoid, 1-2.5 cm; peduncle 3–5 mm.Distribution and habitat
It is found in Taiwan. It is a common species growing on riverbanks from near sea level to.Ecology
Alnus formosana flowers between May–June, fruiting between July–September.
