Table B-22. Roadside disturbed community data for the second 
sampling period (20 July 1981). 
Relative 
frequency 
(percent) 
Frequency 
(percent) 
Species 
Erigeron 
canadensis var. 
pustllus 57.4 71.9 44.9 
Ammophila 
breviligulata 18.5 Byhe) 32.4 
Cenchrus 
tribuloides 7.4 2.4 ING) 
Oenothera humifusa 7.4 1.0 0.63 
Diodia teres Sod 0.03 0.02 
Opuntia compressa S}o il 2.0 
Triplasis purpurea 0.02 0.01 
Total 
Table B-23. Roadside disturbed community data for the third 
sampling period (12 September 1981).! 
Relative 
frequency 
(percent) 
Species 
Triplasis purpurea 
Erigeron 
canadensis var. 
pustllus 
Oenothera humifusa 
Eragrostis elliottii 7.6 23.9 14.9 
Cyperus ovularis 6.3 1.8 | yer 
Cenchrus tribuloides Bid LeSi aioe ie 
Digitaria sp. 2.5 0.8 0.5 
Total 169.1 105.7 
lBased on forty 0.2-meter x 0.2~meter quadrats. 
50 
