Your interesting article opened a question in my mind whether the plant kingdom is farther down the evolutionary process than the animal kingdom. While traveling through Louisiana, I saw a question in a welcome center about what plant is related to the Spanish Moss (Tillandsia usneoides), an epiphyte often seen hanging from the branches of live oaks and cypresses in the south. I opened a small cover revealing the answer -- Pineapple (Ananas comosus). Both are members of the Bromeliaceae family. I tried to imagine what commonality they have to each other but failing that, the only subjective answer I could think of was that I like both of them. Thanks for writing!
Great article! I've always enjoyed researching plant relationships; it's fascinating! I attempt to place related plants
together in my collection but, I run into the same problem; for example all euphorbias aren't succulents.
For azulverde; the common thread with Tillandsias and Ananas, and all bromeliads is that the mother plant dies after flowering and producing pups.
I recently acquired a Jatropha berlandieri, a plant with a huge round caudex, related to the shrub Jatropha intergerrima and Jatropha multifida. The flowers are quite similar, but the shape and form of the plant are quite different. And, what a surprise when I show people the other Jatropha in the garden. For a picture of this plant, go to: http://toptropicals.com/catalog/uid/Jatropha_berlandieri.htm