Table 1 Lists of species that were among the five most dominant at Gibbons Creek Barrens, Pope County, Illinois, USA, based on percent importance value (% IV = sum of relative cover and relative frequency) during each of nine years of vegetation monitoring (from 1989 to 2017) in the fire treatment unit. Percent IV shown in bold are values ranking among the top five for a given year. Species shown in bold were the most dominant during at least one year

Acalypha gracilens Gray

2.31

2.53

0.97

0.74

4.08

2.14

2.97

2.03

1.27

Amphicarpaea bracteata

1.12

1.52

2.26

2.86

3.86

3.09

3.39

0.39

0.78

Carex albicans

7.52

9.49

9.17

8.68

9.22

9.23

8.11

12.57

7.91

Danthonia spicata

6.77

4.08

7.24

10.71

5.31

7.94

5.24

9.61

6.72

Dichanthelium laxiflorum

4.08

5.12

11.96

13.35

9.72

10.79

6.62

5.56

7.08

Dichanthelium linearifolium

2.07

2.28

3.31

3.23

2.30

2.50

1.79

6.51

2.51

Helianthus divaricatus

8.92

8.12

8.42

8.01

8.95

10.11

14.03

10.90

5.85

Parthenocissus quinquefolia

9.74

4.08

3.70

3.94

3.24

2.42

2.70

1.95

2.73

Potentilla simplex

1.41

1.25

1.86

0.80

0.70

0.78

1.89

1.14

8.64

Schizachyrium scoparium

11.26

6.11

4.85

5.03

4.08

3.05

4.00

5.38

6.07

Triodanis perfoliata L. Nieuwl.

0.26

11.05

0.00

0.00

2.63

1.76

1.52

0.84

0.04

Sum of importance values (%)

55.47

55.63

53.75

57.36

54.09

53.80

52.26

56.89

49.59