Here's a start on some more of the eudicot orders: Saxifragales, Brassicales, Caryophyllales, Ericales, and Gentianales. This is of course a small sample but at least covers what I had on the Plantae page, plus some other things like mustard oils and cactus alkaloids.

I've added a spectrum for air even though it is not strictly an absorption spectrum. Sometimes you hear people claim that air is blue, but really it depends on angle; it turns transmitted light orange and redirects the blue other directions. Right now this only shows the former. I'm not sure if it would be of interest to try coding something to show the scattered light too.