Research Article Floristics and Diversity of Invasive Alien Plant Species in Humbo District, South Ethiopia Markos Kuma , 1 Zewde Achiso, 1 Alefu Chinasho , 2 Dalga Yaya, 2 and Samuel Tessema 2 1 Wolaita Sodo University, College of Natural and Computational Science, Department of Biology, Wolaita Sodo, Ethiopia 2 Wolaita Sodo Universities, College of Natural and Computational Science, Department of Environmental Science, Wolaita Sodo, Ethiopia Correspondence should be addressed to Markos Kuma; markoskuma73@yahoo.com Received 15 June 2021; Revised 20 September 2021; Accepted 23 September 2021; Published 21 October 2021 Academic Editor: Chandra Prakash Kala Copyright©2021MarkosKumaetal.isisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Deliberate and unintentional introduction of invasive alien plant species on native biodiversity by aid agencies and other bodies directly or indirectly are being a series of problems on the economy, ecology, politics, and health of life on earth. Identifying and compiling floristics and the status of invasive alien species and identifying which have viable populations are necessary to manage the ecosystems. e present study is therefore intended to provide information for concerned bodies on the area which needs management priority computing the composition, structure, and diversity of invasive alien plants. A field assessment was conducted to determine the distribution and heterogeneity of invasive alien plant species, and then, six kebeles were chosen and transact lines were laid using a purposeful sampling technique. e vegetation and environment data were collected from farmland, grazing land, fallow land, and road sides using 95 subquadrats (5 m × 5 m) set in the center and corner of 19 main quadrats (20 m × 20 m). e voucher specimens collected were taken to the Herbarium of Ethiopia (ETH) for taxonomic identification and future reference. e frequency and density of floristics data were analyzed using MS Excel version 2010, and species diversity was calculated using Shannon (H′), Simpson (D), and evenness (E) indices. Among 35 alien plant species invading natural vegetation in Ethiopia, 25 alien plant species were found in the Humbo district of the Wolaita zone. e densest invasive alien plant species in the area were Parthenium hysterophorus consisting of 15197 individuals/ha, followed by Richardia scabra consisting of 11908 individuals/ha, Xanthium strumarium consisting of 7292 individuals/ha, and Ocimum forskolei consisting of 6280 individuals/ha. e highest species diversity was computed in fallow land (H′ � 2.369), which is followed by farmland (H′ � 1.627) and grazing land (H′ � 1.419). e higher the density of the invasive alien species, the higher the ability to change the structure and diversity of native species of the area results in a decrease in the function and services of the ecosystem. erefore, management methods must prioritize land types that had the highest diversity of invasive alien species. 1. Introduction Invasive species (IS) are either indigenous or nonindigenous species that can heavily colonize a particular habitat [1], but invasive alien species (IAS) are nonnative species that are introduced deliberately or unintentionally in areas outside their natural habitats, where they become established, proliferate, and spread, causing damage to the environment [2]. ey are widely distributed in all kinds of ecosystems throughout the world due to the ability to establish them- selves, invade, out-compete natives, and take over the new environment [3]. Currently, in Ethiopia, Shiferaw et al. [3] reported the presence of 35 alien plant species. A large number of species of IAS are introduced into a new environment either through humans or natural (e.g., winds, birds, animals, and water). ousands of plant species have been transported by humans accidentally or intentionally to areas far from their natural habitats [3]. Invasive alien plants are introduced due to deliberate movement of people and cargo for scientific explorations, industry, and tourism [4]. Human-mediated transport, migration, and commerce are continuing to disperse in- vasive alien plant species (IAPS) across previously insur- mountable environmental barriers such as fresh and marine aquatic ecosystems, mountain ranges, and even inhospitable climate zones [5, 6]. Hindawi International Journal of Ecology Volume 2021, Article ID 6999846, 7 pages https://doi.org/10.1155/2021/6999846