The flowering period was determined for 196 tidal marsh plant species, which included 89 monocotyledons and 107 dicotyledons and represented 63 families and 122 genera, in Mississippi. Observations on living plants in the field, over a 15 year period, were used to document precisely the sequence of flowering phenology. The shortest period of flowering, which occurred in 18 species, was one month with about one month for fruit maturation. The longest period of flowering and fruit development spans nine months. The average period of flowering for all species was 3.2 months. Three basic flowering patterns were noted and described. About 152 species are in flower during July, which represents the peak flowering period in Mississippi tidal marshes. About 65 monocots are in flower from June to August and about 85 dicots are in flower between August and September, representing peaks for these groups. In low salinity marshes, the peak flowering period is reached when 108 species are in bloom between June and July. The peak flowering period in brackish marshes is reached during August, when about 30 species are in flower. The peak flowering period in saline marshes occurs during September when 10 species are in flower. Of the 10 species occurring on hypersaline areas, about seven species are in flower during August. The data presented in this paper fill a void by providing a reference list and two indexes to the tidal marsh flora of Mississippi. The information may also be useful to botanist, researches and teachers on the coasts of Texas, Louisiana, Alabama and northwest Florida.