DOI: 10.36347/sajb.2014.v02i04.010

Pages: 295-306

A qualitative floristic survey conducted in Thiruvallur district to record alien invasive flora. This study recorded 136 species in 90 genera and 37 families. The most speciose family of study area is Asteraceae (with 18 species), Convolvulaceae (11), Caesalpiniaceae (9) and Amaranthaceae (8). While 12 families which include Apocynaceae, Balsaminaceae, Cactaceae, Liliaceae were represented by just single species’ in study area. Among genera, Cassia with 9 species dominated the study area followed by Ipomoea (7) and Indigofera (5). Eighty-nine species from tropical America, 19 from tropical Africa and 6 from tropical South America invaded into Thiruvallur district, Tamil Nadu, India. Of eight life forms herb represented with 95 species followed by shrub and under-shrub (11 species each). Study that concentrates on quantitative analysis is essential to assess the impact of invasive alien species on native flora of Thiruvallur district.