Thoreau's Notes Reveal How Spring Has Changed in 150 Years | Early Spring & Climate Change | Seasonal Events | LiveScience

A violet growing in Concord, Mass. Unlike some other flowers in the town, violets are not shifting their flowering time in response to climate change. As a result, they have become much less common over the past 150 years than they were when the writer Henry David Thoreau monitored them.

via livescience.com

Sigh. I post this on an early March (nominal late Winter) day that reached almost 70F (21C) today.

http://www.livescience.com/18938-thoreau-citizen-science-climate-change.html