The wind-pollinated apetalous flowers are produced on second-year shoots in April; the variably-shaped samarae < 25 mm long by 20 mm wide ripen in June.
Flowers without petals that are pollinated by wind appear on second-year shoots in April. The samaras, which are seed pods with a variable shape, mature in June and measure less than 25 mm long by 20 mm wide.