We performed taxonomic reviews and habitat circumstances survey for 41 un-introduced environmentally harmful plants (as designated by the Ministry of Environment, Korea in 2016). For this purpose, we investigated plant specimens from several herbaria and performed a field survey in the southeastern region of the United States. Base on the result, we presented the most comprehensive results of weed risk evaluation and taxonomic description up to now as well as classification keys for 11 species to apply the regulation management of putative invasive alien species – Centaurea maculosa Lam., Centaurea diffusa Lam., Mikania micrantha Kunth. (Asteraceae), Cenchrus echinatus L., Neyraudia reynaudiana (Kunth) Keng ex Hitchcock, Brachiaria mutica (Forsskål) Stapf, Vulpia bromoides (L.) Gray, Lolium persicum Boissier & Hohennacker, Setaria palmifolia (J. Konig) Stapf (Poaceae), Prosopis glandulosa Torr. (Fabaceae), Fallopia baldschuanica (Regel) Hobub. (Polygonaceae).

Abstract
Introduction
Materials and Methods
Results and Discussion
    Centaurea maculosa Lam., Encycl. [J. Lamarck & al.]1(2):669 (1785)
    Centaurea diffusa Lam., Encycl. [J. Lamarck & al.] 1(2):675 (1785)
    Mikania micrantha Kunth in Humboldt et al., Nov. Gen.Sp. 4, ed. f°:105 (1818)
    Neyraudia reynaudiana (Kunth) Keng ex Hitchcock, Amer.J. Bot. 21: 131 (1934)
    Brachiaria mutica (Forsskål) Stapf in Prain, Fl. Trop. Africa.9: 526 (1919)
    Vulpia bromoides (L.) Gray Nat. Arr. Brit. Pl. ii. 124 (1821)
    Lolium persicum Boissier & Hohennacker in Boissier, Diagn.Pl. Orient., ser. 1. 13: 66 (1854)
    Setaria palmifolia (J. Konig) Stapf, J. Linn. Soc., Bot. 42:186 (1914)
    Prosopis glandulosa Torr. in Ann. Lyc. N.Y. 2:192 (1827)
    Fallopia baldschuanica (Regel) Hobub. in Folia Geobot.Phytotax. 6:176 (1971)
References

• JongYoung Hyun(Department of Biological Science, Gachon University)
• ChangYoung Yoon(Department of Biological Science, Shingyeong University)
• Joo-Hwan Kim(Department of Life Science, Gachon University) Corresponding author