Two years later came version 2. He makes updates to the CD-ROM version of the guide, and he gave copies to friends who helped gather the information. For now, the only hard copy is at the interpretive center, although offering the guide for sale has been discussed.
Newell said what makes Millar's guide special is that while most published field guides are general, maybe describing all types of wildflowers or the plants of Southern California, his is specific to the Back Bay's habitat.
Millar is also interested in the area's birds and wildlife, but those are much harder to photograph.
"You get too close to a bird, it scares it away," he said. "The plants, they kind of stay there — they're rooted in the ground."