There was a whole series of photographs done of Imogen when she was young and romping (that's the best word I think) around the high flower meadows of Mt Rainier.
I happened to catch a show of them several years ago, put on by the University of Washington.
I didn't know about her close-up plants and flower pictures. THey are very evocative of Georgia O'Keefe, except for the media. I wonder if they knew of each other?
I've come across two nudes of Imogen, one on a rocky landscape and one in grass. I think they were both self-portraits, the one on the grass was for sure.
You're right,k. They're both self portraits. There are a few others, but I've never seen them on the web. Haven't really looked for them, though.
timber
The pictures I'm thinking of had the summit of Mt. Rainier in the background, and she was in a meadow of flowers & rocks, with a few alpine trees. Of course, this was in B&W, but I know the place well. It is timeless and her image was almost like a ghost. Sometimes she was wearing a gauzy white dress, sometimes she pulled the dress off!