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