Steeltrap, Lenno has some good advise there. Scott has some real good photos of some of the indicator plants in his book. I do not know of any one book that has all the indicator plants in it. There are some good books out on tree species that might be good to have on hand. The Audubon Society puts out one with photos of the trees, their bark, fruit and general locations in the US. It will fit in a large pocket and can be taken right into the woods as a field guide. As to the different plant species, I do not know of a resource other then to get a list of the plants together and look each one up on line.
Here are photos of a few I took today. I had some time and any excuse to get into the woods is a good excuse.
Here is Jack in the pulpit.
Here is another of the seed cluster. In the earlier spring, this is where the little flap or \"pulpit\" would be.
Here is one of Black Cohash with a flower on it and if you look just above the Cohash plant in the photo, you will see sang growing too.
Here is a shot of a Goldenseal plant and look to the left of it... yep... sang.
Here is some false lilly of the valley (I think).
Here is a Trillium and if you look close, you can see it has a flower on it, kind of drooped toward the front.
Here is a shot of Solomon's Seal.
At first glance, the next photo looks like a bed of sang- I only wish. It is a bed of wild sarsaparilla and can fool ya sometimes. I guess that's why they call it \"fools sang\"
Sang will grow in between the sarsaparilla though.
Here is a photo of White snake root. I have it growing everywhere.
One last one. Here is a photo of Virginia Creeper and sang growing right side by side.
That's a few and there are more. I wanted to get a photo of the seed cluster on the fools sang but, everything on the hill side I was on today must have been nipped by frost this spring. There are some in behind the house that have berries forming on them. I will try to get a photo at some point- providing my \"forgetter\" doesn't over ride my rememberer as it has a tendency to do. I hope some of these will help. I can post more if they are needed.