Click on the following list of common plant species links to see trend figures and distribution maps.
(See descriptions below)

 

Trend Figures:

Trends in abundance. Bar heights show mean abundance of a species at all sites where it was ever observed, even when not observed during a given CTAP cycle (five years).  Error bars represent 95% confidence intervals (bootstrapped).

In the first CTAP cycle (1997-2001), data were collected from 133 forest sites, 128 grassland sites, and 139 wetland sites.
In the second CTAP cycle (2002-2006), data were collected from 150 forest sites, 149 grassland sites, and 149 wetland sites.
In the third CTAP cycle (2007-2011), data were collected from 149 forest sites, 136 grassland sites, and 138 wetland sites.
The fourth CTAP cycle is ongoing (2012 - present). The results through 2014 are summarized here, during which time data were collected from 90 forest sites, 84 grassland sites, and 77 wetland sites.

Map:

CTAP sites where each species was observed across Illinois, through 2014.