The frequency and percentage composition of plants was determined on levees in East St. Charles Parish (County), Louisiana. This parish is west of New Orleans and is bounded on the south by the Mississippi River and on the north by Lake Pontchartrain.
The vegetation was sampled by 55 line transects at the same locations in February-March, May-June and August-September.
Eighty-nine species were recorded in this study. Field notes indicate vernal, estival and autumnal flowering periods in the area. Eleven species were noted to flower only in the February-March study, six species only in the May-June study and eight species only in the August-September study.