Illinois

• Adams 17001
  1,183 taxa Open ↗
• Alexander 17003
  1,220 taxa Open ↗
• Bond 17005
  682 taxa Open ↗
• Boone 17007
  1,163 taxa Open ↗
• Brown 17009
  836 taxa Open ↗
• Bureau 17011
  652 taxa Open ↗
• Calhoun 17013
  1,017 taxa Open ↗
• Carroll 17015
  931 taxa Open ↗
• Cass 17017
  1,389 taxa Open ↗
• Champaign 17019
  1,420 taxa Open ↗

Showing 151–200 of 766 (introduced).

• 
  Centaurea stoebe L. Introduced CEST8

  spotted knapweed · Asteraceae 33 counties
• 
  Centaurea stoebe L. ssp. micranthos (Gugler) Hayek Introduced CESTM

  spotted knapweed · Asteraceae 33 counties
• 
  Centaurium erythraea Rafn Introduced CEER5

  European centaury · Gentianaceae 1 county
• 
  Centaurium pulchellum (Sw.) Druce Introduced CEPU3

  branched centaury · Gentianaceae 3 counties
• 
  Cerastium brachypetalum Pers. Introduced CEBR2

  gray chickweed · Caryophyllaceae 3 counties
• 
  Cerastium diffusum Pers. Introduced CEDI7

  fourstamen chickweed · Caryophyllaceae 3 counties
• 
  Cerastium dubium (Bast.) Guépin Introduced CEDU2

  doubtful chickweed · Caryophyllaceae 1 county
• 
  Cerastium fontanum Baumg. Introduced CEFO2

  common mouse-ear chickweed · Caryophyllaceae 102 counties
• 
  Cerastium fontanum Baumg. ssp. vulgare (Hartm.) Greuter & Burdet Introduced CEFOV2

  big chickweed · Caryophyllaceae 102 counties
• 
  Cerastium glomeratum Thuill. Introduced CEGL2

  sticky chickweed · Caryophyllaceae 48 counties
• 
  Cerastium pumilum W. Curtis Introduced CEPU4

  European chickweed · Caryophyllaceae 3 counties
• 
  Cerastium semidecandrum L. Introduced CESE4

  fivestamen chickweed · Caryophyllaceae 1 county
• 
  Chaenomeles japonica (Thunb.) Lindl. ex Spach Introduced CHJA2

  Maule's quince · Rosaceae 1 county
• 
  Chaenorhinum minus (L.) Lange Introduced CHMI

  dwarf snapdragon · Scrophulariaceae 74 counties
• 
  Chaiturus marrubiastrum (L.) Rchb. Introduced CHMA18

  lion's tail · Lamiaceae 17 counties
• 
  Chamaemelum nobile (L.) All. Introduced CHNO3

  Roman chamomile · Asteraceae 8 counties
• 
  Chelidonium majus L. Introduced CHMA2

  celandine · Papaveraceae 16 counties
• 
  Chelidonium majus L. var. majus Introduced CHMAM

  celandine · Papaveraceae 16 counties
• 
  Chenopodium album L. var. album Introduced CHALA

  lambsquarters · Chenopodiaceae 2 counties
• 
  Chenopodium bonus-henricus L. Introduced CHBO

  good King Henry · Chenopodiaceae 2 counties
• 
  Chenopodium glaucum L. Introduced CHGL3

  oakleaf goosefoot · Chenopodiaceae 21 counties
• 
  Chenopodium murale L. Introduced CHMU2

  nettleleaf goosefoot · Chenopodiaceae 10 counties
• 
  Chenopodium polyspermum L. Introduced CHPO

  manyseed goosefoot · Chenopodiaceae 1 county
• 
  Chenopodium polyspermum L. var. acutifolium (Sm.) Gaudich. Introduced CHPOA

  manyseed goosefoot · Chenopodiaceae 1 county
• 
  Chenopodium urbicum L. Introduced CHUR

  city goosefoot · Chenopodiaceae 10 counties
• 
  Chloris gayana Kunth Introduced CHGA2

  Rhodes grass · Poaceae 1 county
• 
  Chorispora tenella (Pall.) DC. Introduced CHTE2

  crossflower · Brassicaceae 10 counties
• 
  Cichorium intybus L. Introduced CIIN

  chicory · Asteraceae 94 counties
• 
  Cirsium arvense (L.) Scop. Introduced CIAR4

  Canada thistle · Asteraceae 50 counties
• 
  Cirsium vulgare (Savi) Ten. Introduced CIVU

  bull thistle · Asteraceae 82 counties
• 
  Citrullus lanatus (Thunb.) Matsum. & Nakai Introduced CILA3

  watermelon · Cucurbitaceae 17 counties
• 
  Citrullus lanatus (Thunb.) Matsum. & Nakai var. lanatus Introduced CILAL

  watermelon · Cucurbitaceae 12 counties
• 
  Clematis terniflora DC. Introduced CLTE4

  sweet autumn virginsbower · Ranunculaceae 8 counties
• 
  Cleome hassleriana Chod. Introduced CLHA

  pink queen · Capparaceae 6 counties
• 
  Cnicus benedictus L. Introduced CNBE

  blessed thistle · Asteraceae 1 county
• 
  Commelina communis L. Introduced COCO3

  Asiatic dayflower · Commelinaceae 79 counties
• 
  Conium maculatum L. Introduced COMA2

  poison hemlock · Apiaceae 64 counties
• 
  Conringia orientalis (L.) Dumort. Introduced COOR

  hare's ear mustard · Brassicaceae 20 counties
• 
  Consolida ajacis (L.) Schur Introduced COAJ

  doubtful knight's-spur · Ranunculaceae 41 counties
• 
  Consolida regalis Gray Introduced CORE2

  royal knight's-spur · Ranunculaceae 4 counties
• 
  Convallaria majalis L. Introduced COMA7

  European lily of the valley · Liliaceae 12 counties
• 
  Convolvulus arvensis L. Introduced COAR4

  field bindweed · Convolvulaceae 76 counties
• 
  Coriandrum sativum L. Introduced COSA

  coriander · Apiaceae 2 counties
• 
  Coronopus didymus (L.) Sm. Introduced CODI6

  lesser swinecress · Brassicaceae 1 county
• 
  Cosmos bipinnatus Cav. Introduced COBI2

  garden cosmos · Asteraceae 3 counties
• 
  Cosmos sulphureus Cav. Introduced COSU5

  sulphur cosmos · Asteraceae 1 county
• 
  Cotoneaster multiflorus Bunge Introduced COMU9

  cotoneaster · Rosaceae 1 county
• 
  Crataegus monogyna Jacq. Introduced CRMO3

  oneseed hawthorn · Rosaceae 3 counties
• 
  Crepis capillaris (L.) Wallr. Introduced CRCA3

  smooth hawksbeard · Asteraceae 3 counties
• 
  Crepis tectorum L. Introduced CRTE3

  narrowleaf hawksbeard · Asteraceae 4 counties