Alnus serrulata (red alder) tree-top in flower; note advantage to flowering before leaves are out for a wind-pollinated tree

Alnus male and female inflorescences or 'catkins'

Alnus male flowers closeup

Alnus woody, cone-like, female infructescence

Betula bark; "paper" birch

Betula (Birch) leaves; note serrate margins typical of family

Betula female infructescence disintegrates when seeds are shed

Corylus "Hazelnut" fruits - large seeds, small infructescence