Whether ploidy status of plant species is related to their growth form is not well supported by quantitative data despite having been speculated a lot. Deciphering this relationship has implications for management of alien invasive species as well as conservation of rare endemics. Hence, we tested the relationship between ploidy status and growth form in 390 alien plant species. Ploidy data was obtained through standard published literature and web-based sources. Comparison of the relative proportion of diploids and polyploids within each growth form was carried out followed by a comparison between different growth forms and also between some major families of alien plants of the Himalayan region. The results showed that alien aquatic plant species have a remarkably higher percentage of polyploids (81.48 %) than diploids (18.52 %). Among the terrestrial growth forms annuals, particularly polyploid-annuals predominate in the study area. These results allow us to conclude that alien aquatic plant species having polyploid genetic makeup, concurrent to clonal architecture, are more prospective invaders in wetlands while as polyploid annuals, without clonality, invade more dry areas of the valley.
Keywords: Alienspecies, endemics, polyploids, diploids, growth form, annuals, Kashmir Himalaya.