Mar, Apr, May
Tiny monoecious flowers appear in early spring in separate catkins on the same tree: yellowish-brown male flowers in drooping catkins (to 2.5 inches long) and greenish female flowers in smaller, upright catkins (to 1 1/4 inches long). Flowers on catkins are no more than 1/8 inch.
Female flowers are followed by drooping cone-like fruits containing numerous small winged seeds that typically mature in late summer.
Betula - Birches