Drawing A Flower Of Life

Where can I get a book on english plant life?
I’m after an illustrated book that will show me pretty pictures of all the plants and weeds that grow around the British Isles.
I don’t want a gardening book, and I don’t really care for flowers. Trees aren’t so important either, I’m looking for a kind of reference manual that I can use to draw realistic plant life for a 3D world
In case you missed the point – I’m actually looking for a specific recommendation of a non-technical illustrated guide to the flora of the british isles.
`the wild flowers of britain and northern europe`
published by collins £7 i belive
as water colour type illustrations of `plants and weeds`
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