Inch-long spikes of male flowers produce two kinds of pollen: one form floats on the water's surface in raft-like bundles and pollinates floating stigmas on female plants, the other form is released underwater, and drifts with the currents to a union with submerged stigmas.
(the other form; drifts; with the currents; to a union with submerged stigmas)
the other form
drifts
with the currents to a union with submerged stigmas