I'll look through some old floral magazine issues and see what I can find and scan -
In the meantime - Vegetative is nothing more than a term used to decribe how flowers are arranged - With vegetative style, all you are doing is mimicing how flowers would grow in nature.
Example - You have Iris, Carnation, Gladiola, Phlox, Waxflower, Moss, Shelf mushrooms, and Pittosporum that you have to make a design with.
You place each flower as though you would find it in nature....Glads grow tall in the garden, Iris grow tall, but not as tall, You might find carnations growing in front, with the Phlox nestled low in the garden, etc.
There are two types of Vegetative designs - Vegetative round and Vegetative parallel
The Round vegeative is flowers arranged all the way around - that the garden can be seen on all sides - but you still arrange the flowers how you might find them in nature.
The Parallel vegetative is flowers arranged in parallel groupings - again, placing the flowers how they would grow in nature.