Fireweed

This perennial species flowers in summer. Each flower lasts about 48 hours. On the first day, the male organs reach maturity and the pollen is transferred to other flowers by insects. On the second day, the female organs on the same flower reach maturity and receive pollen from younger flowers. This phenomenon prevents the flowers from self-fertilizing. Bumblebees are the main pollinators of fireweed, often sleeping on the flowers at nighttime.