Relictual nectaries in anemophilous species

> An indication that wind pollination may have been derived from animal pollination in some plant groups may be the relict occurrence of nectaries in flowers of some anemophilous taxa. In the dioecious dwarf palm Chamaerops humilis, which is wind-pollinated, Herrera (1989) found that female flowers sometimes secrete nectar. Herrera concluded that nectar which does not attract visitors may represent a trait retained from ancestors with a different floral biology. The current function of floral nectar, not only its presence or absence, should therefore be taken into account when assessing the mode of pollination -- Nicolson, S. W., Nepi, M., & Pacini, E. (Eds.). (2007). Nectaries and nectar (Vol. 4). Dordrecht: Springer.

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Plants are not either/or. They can be wind and/or animal pollinated. The types of plant sexuality are even more numerous. "The complexity of the morphology of flowers and its variation within populations has led to a rich terminology."

Androdioecious: having male flowers on some plants, bisexual ones on others.
Androecious: having only male flowers (the male of a dioecious population); producing pollen but no seed.
Androgynous: see bisexual.
Androgynomonoecious: having male, female, and bisexual flowers on the same plant, also called trimonoecious.
Andromonoecious: having both bisexual and male flowers on the same plant.
Bisexual: each flower of each individual has both male and female structures, i.e. it combines both sexes in one structure. 

etc., etc., etc. The list is very long!

See: https://en.wikipedia.org/wiki/Plant_reproductive_morphology

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