Hi Paul,
My thoughts exactly on the A. montana/gentryi question as well as some other species complexes. For example, the parrasana/ovatifolia question concerning the plants south of Monterrey. FO 76/titanota/horrida. all the A. parryi including ssp. neomexicana, etc.
The genus Agave is considered a young genus and is probably in a state of rapid (for plants) speciation and that's why we see so many intermediates and groups being difficult to sort out.
Greg
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