Pollen-grains cohering into a single group and distributed as such (e.g. in derived subfamilies of Apocynaceae and Orchidaceae).
The waxy body of pollen produced in the milk weed family.
A tightly-bound cluster of pollen grains that is distributed as one unit, as in some Apocynaceae and Orchidaceae.
A sticky mass of pollen grains cohering together within the anther of an Orchid. The entire pollinia can be transferred by insects to another flower.