Siberian Alder - Alnus hirsuta var. sibirica
Birch Family: Betulaceae
Height: to 60 feet / USDA zones 5-9
  Siberian Alder - Alnus sibirica
Siberian Alder Leaflet [2]
Trees to 20 m tall; bark gray-brown, smooth. Branchlets dark gray, angular, densely gray pubescent when young, glabrescent. Buds stipitate, with 2 scales, sparsely pubescent. Petiole 1.5-5.5 cm, densely pubescent; leaf blade suborbicular, rarely broadly ovate, 4-9 × 2.5-9 cm, abaxially light green or glaucescent, densely or sparsely brown hispidulous, rarely subglabrous, sometimes bearded in axils of lateral veins, adaxially dark green, sparsely villous, base rounded or broadly cuneate, rarely cuneate or subcordate, margin undulate-serrate, apex rounded, rarely acute; lateral veins 5-10 on each side of midvein. Female inflorescences 2-8 in a raceme, subglobose or oblong, 1-2 cm; peduncle 2-3 mm; bracts 3-4 mm, woody, base cuneate, apex rounded, 5-lobed. Nutlet broadly ovate, ca. 3 mm, with papery wings ca. 1/4 as wide as nutlet. Fl. May-Jul, fr. Jul-Aug.

Native to temperate forests, along streambanks; 700-1500 m. Heilongjiang, Jilin, Liaoning, Nei Mongol, Shandong [Japan, Korea, Russia (Siberia)]

The wood is hard and dense, and is used for making agricultural tools and furniture. [1]
Siberian Alder - Alnus sibirica

Siberian Alder - Alnus sibirica
Siberian Alder - Alnus hirsuta var. sibirica
Started from seed, Morton Arboretum acc. 313-93*6 is 15 years old

 

References
  1. www.efloras.org, Flora of China, Alnus hirsuta Turczaninow ex Ruprecht, Bull.
  2. Morton Arboretum accession 313-93*6 photographed May 26, 2008