본 조사는 유구천의 수생식물과 수변계류식물의 목록을 작성하고 관속식물의 다양성을 연구하기 위해 문헌조사를 포함하여, 2009년 8월부터 2010년 9월까지 총 4회에 걸쳐 7개 지점을 조사하였다. 7개 지점의 조사를 통해 유구천의 관속식물은 88과 229속 290종 3아종 30변종 5품종 328분류군으로 확인되었다. 조사지역 내의 한국 특산식물은 개나리(Forsythia koreana (Rehder) Nakai), 오동나무 (Paulownia coreana Uyeki), 병꽃나무 (Weigela subsessilis (Nakai) L.H. Bailey) 등 3분류군이 확인되었다. 산림청 지정 희귀 및 멸종위기 식물은 낙지다리 (Penthorum chinense Pursh), 땅나리 (Lilium callosum Siebold & Zucc.), 꽃창포(Iris ensata var. spontanea (Makino) Nakai), 창포 (Acorus calamus L) 등 4분류군이 확인되었다. 식물구계학적 특정종은 총 27분류군이 확인되었는데, 그 중 중요한 의미를 가지는 III~V등급종은 V등급종이 2분류군, IV등급종이 2분류군, III등급종이 9분류군으로 총 13분류군이 발견되었다. 귀화식물은 10개과 27분류군이 확인되었으며, 이는 조사된 전체 목록 중 약 8.3%를 차지하는 것으로 확인되었다. 유구천은 마을이 하천을 따라 발달하고, 도로나 농경지 등에 따라 인간의 간섭이 지속적으로 증가 할 것으로 여겨지며 이에 따라 귀화식물의 유입도 증가 할 것으로 판단되어진다. 조사지점별 식물들의 집괴분석과 좌표 결정분석 결과 유구천 본류형, 소하천형, 저수지형 등 3개 모둠으로 구별되었다.

Mt. Deoktaesan(1,113 m) is located in Jinan-gun Baekun-myon and Jangsu-gun Chunchun-myon. Investigated area was decided to include Mt. Deoktaesan, Mt. Seongaksan and its neighbor area, and this study was conducted from March to October, 2015 in 12 days. Based on the voucher, vascular plants in Mt. Deoktaesan were 108 families 341 genera 525 species 4 subspecies 64 varieties 14 forms, totally 607 taxa, which is 12.4% of total Korean flora. Korean endemic plants were 15 species. Among these species, Populus tomentiglandulosa T.B.Lee, Campanula takesimana Nakai and Forsythia koreana (Rehder) Nakai are verified as planted species. Rare and endangered plants of designated by Korea Forest Service were 10 taxa, such as Peucedanum hakuunense Nakai, Paeonia japonica (Makino) Miyabe & Takeda, Koelreuteria paniculata Laxmann, Eranthis stellata Maxim., Eranthis stellata Maxim., Viola albida Palib., Chionanthus retusus Lindl. & Paxton, Campanula takesimana Nakai, Tricyrtis macropoda Miq. and Iris ensata var. spontanea (Makino) Nakai, respectively. Phytogeographical special plants were totally 41 taxa, which were grade 17 taxa of garde I, 12 taxa of grade Ⅱ, 12 taxa of grade Ⅲ, 8 taxa of grade Ⅳ, and 1 taxon of grade Ⅴ.

A floristic study was conducted 23 times from March 2010 to May 2016 on Mt. Yongbongsan and Mt. Suamsan region of Chungcheongnam-do which lies across Sapgyo-eup, Deoksan-myeon Yesan-gun, and Hongbuk-myeon Hongseong-gun. Based on voucher speciemens, list of vascular plants found in this area were contained 532 taxa in total including 105 families, 312 genera, 468 species, 4 subspecies, 47 varieties, and 13 forma. The 8 taxa were Korean endemic plants such as Populus tomentiglandulosa T.B.Lee, Clematis brachyura Maxim, C. trichotoma Nakai, Indigofera koreana Ohwi, Forsythia koreana (Rehder) Nakai, Paulownia coreana Uyeki, Weigela subsessilis (Nakai) L.H.Bailey, Aster koraiensis Nakai. 4 taxa of rare plants designated by the Korea Forest Service such as Taxus cuspidata Siebold & Zucc., Lithospermum arvense L., Allium senescens L., and Iris ensata var. spontanea (Makino) Nakai. Endangered plants designated by the Ministry of Environment was not found in this study. The 11 taxa of floristic regional indicator plants in 3 rd to 5 th degree were found. 68 taxa naturalized plants were found and the naturalized ratio was 12.8% while 21.2% of urbanized ratio which is regarded quite high.