On 4/3/07 14:34, in article lid, "Stewart Robert
Hinsley" wrote:

In message , K
writes
The system is based on the flowers, since they are the bit that enables
sexual reproduction and therefore govern the ancestral 'tree' of the
plant in question.

Actually the classification is ideally based on "total evidence",
whether flower and fruit morphology, or vegetative morphology, or pollen
morphology, or ctyology, or biochemistry, or DNA sequences. Flower and
fruit morphology does however usually offer a better guide to
relationships that other easily examined characters.

(Note that the system also applies to non-flowering plants like mosses,
ferns and conifers. A similar system, growing from the same root,
applies to animals.)

Back in the 18th century Linnaeus ("The Father of Botany") introduced
both the binomial naming scheme which is the root of the modern
International Code of Botanical Nomenclature (ICBN), and an artificial
(i.e. not based on relationships) classification based on the numbers of
stamens and pistils. He also produced an outline of a natural (one based
on relationships, as far as he could deduce) classification

Very interesting but not easy for the beginner, IMO!

--
Sacha
http://www.hillhousenursery.co.uk
South Devon
http://www.discoverdartmoor.co.uk/
(remove weeds from address)