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Flowering plants, or angiosperms (1, 2), dominate
large areas of the land surface and represent the
climax of vascular plant evolution. They occupy a
wide range of habitats and about a quarter of
a million species have been recognized so far.
However, many more, particularly from tropical
regions, await scientific description. Angiosperms are
very diversified in their form, and range in size from
a few millimetres in diameter in the aquatic Lemna
(3) to 90 m or more in height in Eucalyptus (4). Some
complete their life cycle in less than 2 months while
some specimens of Quercus (oak) may live nearly
a thousand years