Originally Posted by oneoffour
Odd I went and looked in my herb books and checked some cooking books too and it seems there is one species that is fennel. Maybe there are varieties just as with tomatoes and some bulb while others don't? In any case it seems I am wrong there is one species it is just those in my garden have no bulbous base.
Yes, one species. The differences in the bulbs are actually the different sexes of the plant. I cannot remember which sex has the larger bulb but I believe it is the male, while the female's bulb is a bit sweeter. Apparently this is a little known fact as a quick search of the web provided no information, even on wiki.