Wall flora is referred as, the flora grown on buildings, temples, house remains or their surrounding areas. Walls are manmade artificial habitats. The wall plants are the result of spontaneous colonization unassisted by human action. The objectives of the study are to analyze the seasonal appearance of angiosperm flora on the walls of the study area.
An extensive field survey was conducted from July 2012 to July 2014 to record the angiospermic flora growing on the walls in different parts of Katathurai panchayath. One visit was made after every three months. Thus a total of six visits were made for the field observations in a year. During the process of observation visits were made to all the practically possible places in search of angiosperm wall flora. A total of 55 plant species are observed, out of which 47 plant species are dicotyledons and only 8 species are monocotyledons. Total 46 genera comprising 24 families are documented. Asteraceae, Amaranthaceae and Malvaceae are the dominant families of the wall flora. The plants found on walls of study area belonging to the families of Aizoaceae, Amaranthaceae, Solanaceae, Euphorbiaceae, Capparidaceae, Malvaceae, Poaceae, Nyctaginaceae, Cucurbitaceae, Moraceae, Rubiaceae, Acanthaceae, Caricaceae, Lamiaceae, Commelinaceae, Astraceae, Menispermaceae, Meliaceae, Magnoliaceae, Convoluvlaceae, Anacardiaceae and Cyperaceae. Among the families, the higher genus was recorded mainly to the Asteraceae (7 taxa), Amaranthaceae (4 taxa), Malvaceae (5 taxa), Acanthaceae (3 taxa) and Poaceae (4). The largest number of species belongs to the genera is Solanum (3), Ficus (3) Amaranthus (3), Andrographis (2) and Sida (2). It can be concluded from the study that the study area is dominated by Angiosperms. Most of the flora on walls appears during the rainy and winter seasons of the year. One-fourth of the wall flora is represented by the alien species. The favourable climatic conditions and the composition of old historical walls, have contributed to high taxonomic diversity at species, genera and family levels.