The problem I'm seeing is to much information on one page. To me that Iris page is very long and if I was looking for Iris info I'm not sure how long I would have read before I gave up looking. I think what you should have done there is have a brief intro article about Irises. Then a list of article titles or title with a short snippet like the articles on the home page, that link to the actual articles. I like the idea of a central genus page as a portal to articles and "true" parent/category pages or whatever you might decide to name them. I've always had a problem with the genus/parents pages. The genus level is just to broad to clone data across the entire genus. Looking at Irises, the only date is perennial and showy. Look at my area of interest which is Hibiscuses. The genus is over 250 species that range from swamps to desert, 20 + feet to under a foot, annual to perennial. There is not much you can be applied to the entire genus, but if the genus page were linked to parent plants at the species level like Hibiscus moscheutos, H. rosa-sinensis, H. syriacus then you could much more easily clone data. You could also group articles specific to those species on each relevant parent page.
