Alnus rubra Bong.

Red Alder

A narrow, pyramidal tree to 15 m tall. Buds red, curved, resinous. Young shoots angular, sticky red, slightly pendulous. Leaves more or less oval, 8-12 cm long, thick, lobed to wavy-edged, grey to bluish below and occasionally with rusty hairs, strongly double-toothed or lobed, margin turned under; veins pairs mostly 12-15. Leaf stalk 1.5-3 cm long. Flowers in spring. Fruits in groups of 6-8. [A. oregona Nutt.]

Alaska to California

NSW: Blue Mountains Botanic Garden Mount Tomah.

Source: Spencer, R. (1997). Betulaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Fagales
family       Betulaceae
genus        Alnus Mill.