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flowering whitetop plants at the sites excavated in 1998 grew from root fragments that were broken during excavation. Thus, whitetop occurred at these sites prior to excavation and became re-established after excavation. The abundance of giant whitetop varied among all sites. The change in vegetation during this growing season at the Johnson Unit 4 site is displayed in Figure 3.12. Table 3.4. Percent of each cover type at each levee removal site in June 1998 (based on three transects per site). Site Barren Native trees or shrubs Saltcedar Whitetop Other herbs Bonanza 78 3 12 1 6 Stirrup 57 1 33 6 3 Horseshoe 99 0 0 1 0 Baeser Bend 98 0 0 2 0 Above Brennan 97 0 0 3 0 J4 98 2 0 0 0 Upper L7 97 0 0 1 1 Lower L7 80 1 11 14 3 Old Charley diked 87 0 4 8 1 Table 3.5. Percent of each cover type at each levee removal site in July 1998 (based on three transects per site). Site Barren Native trees or shrubs Saltcedar Whitetop Other herbs Bonanza 68 10 16 2 4 Stirrup 56 3 22 8 10 Horseshoe 94 2 0 0 3 Baeser Bend 75 4 0 1 1 Above Brennan 73 23 0 4 0 J4 87 10 0 1 1 Upper L7 90 7 0 26 2 Lower L7 69 2 1 1 3 Old Charley diked 75 8 5 4 9 27