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Originally Posted by rowan57
Not every Species entry is going to have a Cultivar name. ... However, if you are looking at it from a botanical point of view then it is quite likely that the majority of Species will have a Cultivar also.
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And, as you know Rowan, it only takes one example of inaccuracy to invalidate the design of a database. Therefore, I have to allow for the Cultivar to be
optional not required. OTOH, every Cultivar
must have a valid Specie, and every Specie
must have a valid Genus.
Also, Specimen could relate to
either a Cultivar
or a Specie, depending on whether or not a relevant cultivar exists for that particular specimen.