Table 59. Composition of vegetation along 300-foot permanent transect 

 west of 1,200-foot sea oats dune, September 1973. 1 



Species 





Hits per 100 



pins 





to 100 feet 



100 to 200 feet 



200 to 300 feet 



Total 



Bacopa monnieri 



13.4 



17.8 



25.6 



18.9 



Hydrocotyle bonariensis 



2.9 



0.8 



1.5 



1.7 



Eleocharis caribaea 



1.7 



0.6 



2.4 



1.5 



Sporobolus virginicus 



1.1 



0.3 



2.9 



1.4 



Fimbristylis castanea 





3.9 



0.3 



1.4 



Sesuvium portulacastrum 



1.1 



0.3 



0.3 



0.6 



Erigeron myrionactis 





1.1 





0.4 



Oenothera Drummondii 





0.8 





0.3 



Croton punctatus 







0.9 



0.3 



Eleocharis parvula 





0.6 





0.2 



Scirpus americana 







0.6 



0.2 



Panicum amarum 



0.3 







0.1 



Baptisia leucophaea 





0.3 





0.1 



Cyperus esculentus 







0.3 



0.1 



Uniola paniculata 



0.3 







0.1 



Bare ground (no hit) 



79.4 



75.0 



67.4 



74.0 



1. Transect is east-west, originating 10 feet west of 450-foot mark of 1,200-foot sea oats dune, and 

 extending 300 feet west. Markers are metal fenceposts at 100-foot intervals. Sampling method: 

 10-point, point-frame, with a total of 1,050 points. Frame placed end-to-end along transect. 

 All hits per pin were recorded; all species are listed. 



Table 60. Composition of vegetation leeward of North Section Fence 

 south Padre Island, November 1973. 1 



Species 



Frequency 



Percent cover 



Importance index 



Fimbristylis castanea 



55 



1.2 



66.0 



Sesuvium portulacastrum 



10 



0.2 



2.0 



Uniola paniculata 



5 



0.9 



4.5 



Panicum amarum 



1 



1.0 



1.0 



Ipomoea Pes-caprae 



2 



0.2 



0.4 



Ipomoea stolonifera 



1 



trace 





1. One hundred 1-meter-diameter hoop samples in area west of to 2,400 feet. 

 North Section Fence (fence-build dunes) as follows: Two parallel north-south 

 lines, each with 50 samples, 100 and 200 feet, respectively, west of the dune line. 



169 



