1. The flowers are produced in pendulous, catkin-like or spike inflorescence.
2. The axis of inflorescence elongates so that the flowers are brought well above the leaves.
3. The perianth is absent or highly reduced.
4. The flowers are small, inconspicuous, colourless, not scented, do not secrete nectar.
5. The stamens are numerous, filaments are long, exerted and versatile.
6. Anthers produce enormous quantities of pollen grains compared to number of ovules available for pollination. They are minute, light and dry so that they can be carried to long distances by wind.
7. In some plants anthers burst violently and release the pollen into the air.
Example: Urtica.
8. Stigmas are comparatively large, protruding, sometimes branched and feathery, adapted to catch the pollen grains. Generally single ovule is present.
9. Plant produces flowers before the new leaves appear, so the pollen can be carried without hindrance of leaves.
