Okay. I've published a range of articles on the subject and am continually refining the page where it is situated. You just reminded me to upload the first conference paper I wrote in 2006 on the subject. Must dig up the journal also and screenshot it. The page where it is detailed is here and it is the link I forward around. Please excuse the website at the moment as a recent update has thrown out the design. http://www.skyflowers.co/bromeliad-family/