Mexican Marigold

I am confused about the identity of several perennial Tagetes species commonly called Mexican Marigold.  A web search shows, for example T. lemmonii, T. nelsonii, T. lucida, T. erecta, etc. - sometimes with what appear to be the same pictures assigned to different species.

I had always thought that the commonly available (in southern California) Mexican Marigold was T. lemmonii, and that the less commonly found threadleaf version was T. nelsonii, but now am not certain.  Can anyone clarify these species or point me to a good web site?

Thanks,
Dan Townley
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