The Gramineae offer a prominent example of a dominant self-pollinated or wind :pollinated family, and this may find explanation in a multiplicity of factors.
Water-pollinated plants, Hydrophilae.
Pollinated under the water' e.g.
Wind-pollinated plants, Anemophilae.
In 1906 he gave an account of the early stages of development of the male and female organs and, among other interesting statements in regard to the general biology of Welwitschia, he expressed the opinion that, as Hooker suspected, the ovules are pollinated by insect-agency.
I), which is dioecious, the flowers are borne above the surface of the water, have conspicuous white petals, contain honey and are pollinated by insects.
The plants are trees or shrubs with simple leaves alternately arranged and small unisexual flowers generally arranged in catkins and pollinated by wind-agency.
Grasses are generally wind - pollinated, though selffertilization sometimes occurs.