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Field Survey Summary Tables – Mixed Grassland Ecoregion
61
Table 48. 2009 irrigated perennial crops in the Mixed Grassland Ecoregion (97 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
83.0
46.4
55.9
11.0
13.3
73.8
143.3
2
Canada thistle
34.9
6.0
17.2
0.5
1.5
9.4
21.7
3
Lamb's-quarters
17.5
4.3
24.6
0.7
4.2
31.2
15.1
4
Green foxtail
4.8
2.8
58.4
1.4
29.0
84.6
12.8
5
Kochia
18.3
2.3
12.8
0.5
2.6
31.4
11.7
6
Smooth brome
10.8
2.9
27.3
0.5
4.6
30.6
9.8
7
Wild buckwheat
7.6
3.6
46.8
0.5
6.4
15.8
9.4
8
Foxtail barley
12.9
2.0
15.4
0.3
2.3
12.8
8.4
9
Redroot pigweed
8.0
2.5
31.0
0.5
6.0
26.4
8.3
10
Quack grass
12.5
1.9
15.2
0.3
2.3
13.0
8.1
11
Perennial sow-thistle
7.8
2.0
26.1
0.2
2.5
7.6
6.1
12
Wild oats
8.3
1.2
14.4
0.2
2.0
7.6
5.2
13
Stinkweed
2.7
1.2
45.0
0.4
15.0
28.2
4.6
14
Barnyard grass
4.3
1.1
26.1
0.1
2.4
5.2
3.3
15
Field bindweed
4.1
0.7
16.7
0.1
2.6
6.2
2.8
16
Pasture sage
2.0
1.1
55.0
0.1
5.7
6.8
2.5
17
White sweet-clover
2.0
0.9
45.0
0.1
5.0
8.0
2.2
18
Spiny annual sow-thistle
4.3
0.5
10.7
< 0.1
0.7
1.4
2.2
19
Narrow-leaved hawk's-beard
2.9
0.8
26.7
< 0.1
1.5
2.2
2.1
20
Yellow sweet-clover
3.9
0.5
12.5
< 0.1
1.0
2.0
2.1
21
Goat's-beard
2.9
0.3
10.0
< 0.1
0.9
1.8
1.5
22
Shepherd's-purse
2.9
0.2
8.3
< 0.1
0.5
0.8
1.4
23
White clover
2.9
0.2
8.3
< 0.1
0.4
0.6
1.4
24
Russian thistle
2.9
0.1
5.0
< 0.1
0.2
0.2
1.2
25
Annual sow-thistle
2.0
0.3
17.5
< 0.1
1.3
2.4
1.2
26
Canola (Argentine)
2.1
0.2
10.3
< 0.1
0.5
0.8
1.0
27
Tartary buckwheat
1.1
0.4
35.0
< 0.1
2.2
2.2
1.0
28
Broad-leaved plantain
2.3
0.1
5.0
< 0.1
0.3
0.4
1.0
29
Wheat
1.4
0.2
15.0
< 0.1
3.2
3.2
0.9
30
Curled dock
2.0
0.1
7.5
< 0.1
0.3
0.4
0.9
31
Bull thistle
2.0
0.1
5.0
< 0.1
0.3
0.4
0.8
32
Pale smartweed
1.4
0.2
15.0
< 0.1
1.4
1.4
0.8
33
Prickly rose
1.0
0.2
20.0
< 0.1
2.2
2.2
0.7
34
Wild mustard
1.4
0.1
10.0
< 0.1
0.6
0.6
0.7
35
White cockle
1.4
0.1
5.0
< 0.1
0.2
0.2
0.6
36
Prickly lettuce
1.4
0.1
5.0
< 0.1
0.2
0.2
0.6
37
Common burdock
1.0
0.1
10.0
< 0.1
1.4
1.4
0.5
38
Silver sagebrush
1.0
0.1
10.0
< 0.1
0.4
0.4
0.5
39
Rough cinquefoil
1.1
0.1
5.0
< 0.1
0.2
0.2
0.5
40
Showy milkweed
1.0
< 0.1
5.0
< 0.1
0.4
0.4
0.4
41
Flixweed
1.0
< 0.1
5.0
< 0.1
0.2
0.2
0.4
42
Round-leaved mallow
1.0
< 0.1
5.0
< 0.1
0.2
0.2
0.4