[PCA] NEWS: Ecologists Use 70-Year-Old Pressed Plants to Chart City's Vanishing Native Flora

[Olivia Kwong]

http://www.sciencedaily.com/releases/2011/03/110318091012.htm

Ecologists Use 70-Year-Old Pressed Plants to Chart City's Vanishing Native 
Flora

ScienceDaily (Mar. 18, 2011) -- More than half of the world's population 
now lives in cities, yet we know little about how urbanization affects 
biodiversity. In one the first studies of its kind, ecologists in 
Indianapolis, USA have used 70 year-old dried plant specimens to track the 
impact of increasing urbanization on plants.

See the link above for the full article text.