anchor.diff:  "Ardisia chinensis Benth.",4537,"GN","Ryukyu"
   "Damnacanthus indicus Gaertn. f.",4823,"GN","Ryukyu"
   "Trachycystis microphylla",30385,"GN","Ryukyu"
  +"Elaeagnus umbellata Thunb.",3200,"GN","Ryukyu"
   "Euonymus hederaceus Champ. ex Benth.",30391,"?","Ryukyu"
  -"Elaeagnus umbellata Thunb.",3200,"GN","Ryukyu"
   "Juniperus taxifolia Hook. et Arn.",3995,"BK","Ogasawara"
  -"Calophyllum inophyllum L.",10796,"GN","Ogasawara"
  +"Dendrocacalia crepidifolia (Nakai) Nakai",4129,"BK","Ogasawara"
   "Syzygium buxifolium Hook. et Arn.",3216,"GN","Ogasawara"
  -"Dendrocacalia crepidifolia (Nakai) Nakai",4129,"BK","Ogasawara"
   "Ardisia sieboldii Miq.",4531,"GN","Ogasawara"
   "Pandanus boninensis Warb.",30313,"BK","Ogasawara"
  +"Calophyllum inophyllum L.",10796,"GN","Ogasawara"
   "Croton cascarilloides Raeusch.",5299,"GN","Ryukyu"
   "Hernandia nymphaeifolia (C. Presl) Kubitzki",10309,"GN","Ogasawara"
   "Ipomoea pes-caprae (L.) Sweet subsp. brasiliensis L.",415,"GN","Ogasawara"
  +"Cassytha filiformis L.",10263,"GN","Ogasawara"
   "Thuarea involuta (G. Forst.) R. Br. ex Smith",29774,"GN","Ogasawara"
  +"Myoporum boninense Koidz.",5163,"BK","Ogasawara"
   "Scaevola taccada (Gaertn.) Roxb.",5209,"GN","Ogasawara"
  -"Cassytha filiformis L.",10263,"GN","Ogasawara"
  -"Myoporum boninense Koidz.",5163,"BK","Ogasawara"
  -"Youngia japonica (L.) DC.",4062,"GN","Ogasawara"
  -"Vitex rotundifolia L. f.",4896,"GN!","Ogasawara"
   "Caesalpinia decapetala (Roth) Alston",11581,"GN","Ryukyu"
   "Thalictrum minus L. var. hypoleucum (Siebold et Zucc.) Miq.",10543,"GN","Ryukyu"
   "Acer oblongum Wall. ex DC. var. itoanum",650,"BK","Ryukyu"
   "Hedera rhombea (Miq.) Bean",5740,"GN","Ryukyu"
   "Hernandia nymphaeifolia (C. Presl) Kubitzki",10309,"GN","Ryukyu"
  -"Hibiscus tiliaceus L.",5514,"GN","Ogasawara"
  +"Trema orientalis (L.) Blume",9763,"GN","Ogasawara"
   "Lycium sandwicense A. GrayA. Gray",4734,"BK","Ogasawara"
  -"Lysimachia mauritiana Lam.",4550,"GN","Ogasawara"
  -"Trema orientalis (L.) Blume",9763,"GN","Ogasawara"
   "Salsola komarovii Iljin",10216,"GN","Ryukyu"
   "Calophyllum inophyllum L.",10796,"GN","Ryukyu"
   "Quercus phyllyreioides A. Gray",9720,"GN","Ryukyu"
   "Melicope triphylla (Lam.) Merr.",5335,"GN","Ryukyu"
  -"Wedelia prostrata Hemsl.",3146,"GN","Ogasawara"
   "Celtis boninensis Koidz.",9769,"GD","Ogasawara"
  +"Paederia foetida L.",4835,"GN","Ogasawara"
  +"Rhododendron boninense Nakai",4433,"BK","Ogasawara"
   "Gahnia tristis Nees",23807,"GN","Ogasawara"
  -"Osteomeles anthyllidifolia (Sm.) Lindl. var. subrotunda (K. Koch) Masam.",11287,"GN","Ogasawara"
  -"Paederia foetida L.",4835,"GN","Ogasawara"
  -"Eclipta prostrata (L.) L.",4096,"GN","Ogasawara"
  -"Rhododendron boninense Nakai",4433,"BK","Ogasawara"
  -"Nephrolepis biserrata (Sw.) Schott",3425,"GN","Ogasawara"
  +"Argusia argentea (L. f.) H. Hein",4866,"GN","Ogasawara"
  +"Nephrolepis cordifolia (L.) C. Presl",3424,"GN","Ogasawara"
   "Ixeris longirostrata (Hayata) Nakai",4039,"BK","Ogasawara"
   "Cnidium japonicum Miq.",5782,"GN","Ogasawara"
  -"Nephrolepis cordifolia (L.) C. Presl",3424,"GN","Ogasawara"
   "Blechnum orientale L.",3530,"GN","Ogasawara"
   "Limonium wrightii (Hance) O. Kuntze",4582,"GD","Ogasawara"
  -"Planchonella obovata (R. Br.) Pierre",4583,"GN","Ogasawara"
  -"Argusia argentea (L. f.) H. Hein",4866,"GN","Ogasawara"
  +"Nephrolepis biserrata (Sw.) Schott",3425,"GN","Ogasawara"
  +"Osteomeles anthyllidifolia (Sm.) Lindl. var. subrotunda (K. Koch) Masam.",11287,"GN","Ogasawara"
   "Farfugium japonicum (L.) Kitam.",4106,"GN","Ogasawara"
   "Crepidiastrum ameristophyllum (Nakai) Nakai",4029,"BK","Ogasawara"
  +"Planchonella obovata (R. Br.) Pierre",4583,"GN","Ogasawara"
   "Orobanche boninsimae (Maxim.) Tuyama",5137,"BK","Ogasawara"
  +"Oryzopsis obtusa Stapf ex Oliver",29754,"BK/","Ryukyu"
   "Melanolepis multiglandulosa (Blume) Rchb. f. et Zoll.",5289,"GN","Ryukyu"
  -"Oryzopsis obtusa Stapf ex Oliver",29754,"BK/","Ryukyu"
   "Diospyros egbert-walkeri Kosterm.",4591,"GD!","Ryukyu"
   "Ardisia crispa (Thunb.) DC.",4534,"GN","Ryukyu"
   "Bredia okinawensis (Matsum.) H. L. Li",5676,"BK","Ryukyu"
  
positive.code: "Dendranthema shiwogiku (Kitam.) Kitam.",4238,"BK","Kochi"
  "Crinum asiaticum var. japonicum Baker",26369,"GN","Kochi"
  "Mitella yoshinagae H. Hara",11175,"BK","Kochi"
  "Rhynchospermum verticillatum Reinw.",4164,"GN","Tokushima"
  "Pseudotsuga japonica (Shiras.) Beissn.",3974,"BK","Kochi"
  "Pseudotsuga japonica (Shiras.) Beissn.",3974,"BK","Tokushima"
  "Callicarpa kochiana Makino",4900,"GN","Tokushima"
  "Angelica japonica A. GrayA. Gray",3247,"GN","Kochi"
  "Angelica japonica A. GrayA. Gray",3247,"GN","Tokushima"
  "Elaeagnus macrophylla Thunb.",5555,"GN","Kochi"
  
negative.code: "Artemisia fukudo Makino",4212,"GN","Okayama"
  "Rhododendron japonicum (A. Gray) Suringar",4465,"BU","Kagawa"
  "Rubus sieboldii Blume",11407,"BU","Kagawa"
  "Hylotelephium sieboldii (Sweet ex Hook.) H. Ohba var. sieboldii",10998,"BK","Kagawa"
  "Hylotelephium sieboldii (Sweet ex Hook.) H. Ohba var. sieboldii",10998,"BK","Hyogo"
  "Cladium mariscus subsp. mariscus",21441,"GN","Kagawa"
  "Carpinus turczaninovii Hance",9711,"GN","Kagawa"
  "Carpinus turczaninovii Hance",9711,"GN","Hyogo"
  "Persicaria chinensis (L.) H.Gross",9989,"GN","Hyogo"
  "Hylotelephium verticillatum (L.) H. Ohba var. verticillatum",10987,"GN","Kagawa"
  "Artemisia fukudo Makino",4212,"GN","Hyogo"
  "Forsythia togashii Hara",4619,"BK","Kagawa"
  "Forsythia togashii Hara",4619,"BK","Hyogo"
  "Premna microphylla Turcz.",4897,"GN","Kagawa"
  "Premna microphylla Turcz.",4897,"GN","Hyogo"
  "Machilus japonica Siebold et Zucc. ex Meisn.",10298,"GN","Kagawa"
  "Cnidium japonicum Miq.",5782,"GN","Osaka"
  "Zanthoxylum piperitum (L.) DC.",5338,"GN","Osaka"
  "Ostrya japonica Sarg.",9710,"GN","Mie"
  "Ipomoea indica (Burm.) Merr.",4769,"GN","Mie"
  "Myrica gale L. var. tomentosa C.DC.",9573,"GN","Aichi"
  "Cnidium japonicum Miq.",5782,"GN","Aichi"
  "Phyla nodiflora (L.) Greene",4915,"GN","Aichi"
  "Michelia compressa (Maxim.) Sarg.",10254,"GN!","Aichi"
  "Glochidion obovatum Sieb. et Zucc.",5286,"BU","Aichi"
  