Water-pollinated plants, Hydrophilae.
Wind-pollinated plants, Anemophilae.
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.
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.
Very few aquatic plants are pollinated under water, but this is wellknown to occur in species of Zostera and of Naias.
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.
Pollinated under the water' e.g.
- C. Animal-pollinated plants, Zoidiophilae, are subdivided according to the kind of animal by agency of which pollination is effected, thus: a.
Grasses are generally wind - pollinated, though selffertilization sometimes occurs.
The plants are trees or shrubs with simple leaves alternately arranged and small unisexual flowers generally arranged in catkins and pollinated by wind-agency.