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 201–250 of 3,775.

• 
  Anthemis cotula L. Introduced ANCO2

  stinking chamomile · Asteraceae 98 counties
• 
  Anthemis tinctoria L. Introduced ANTI

  golden chamomile · Asteraceae 4 counties
• 
  Anthoxanthum aristatum Boiss. Introduced ANAR7

  annual vernalgrass · Poaceae 1 county
• 
  Anthoxanthum odoratum L. Introduced ANOD

  sweet vernalgrass · Poaceae 4 counties
• 
  Anthoxanthum odoratum L. ssp. odoratum Introduced ANODO2

  sweet vernalgrass · Poaceae 4 counties
• 
  Anthriscus cerefolium (L.) Hoffm. Introduced ANCE

  garden chervil · Apiaceae 1 county
• 
  Anthriscus sylvestris (L.) Hoffm. Introduced ANSY

  wild chervil · Apiaceae 2 counties
• 
  Antirrhinum majus L. Introduced ANMA3

  garden snapdragon · Scrophulariaceae 1 county
• 
  Apios americana Medik. Native APAM

  groundnut · Fabaceae 76 counties
• 
  Apios priceana B.L. Rob. Native APPR

  traveler's delight · Fabaceae 2 counties
• 
  Aplectrum hyemale (Muhl. ex Willd.) Torr. Native APHY

  Adam and Eve · Orchidaceae 41 counties
• 
  Apocynum androsaemifolium L. Native APAN2

  spreading dogbane · Apocynaceae 54 counties
• 
  Apocynum cannabinum L. Native APCA

  Indianhemp · Apocynaceae 102 counties
• ⚘
  Apocynum ×floribundum Greene (pro sp.) [androsaemifolium × cannabinum] Native APFL

  Apocynaceae 10 counties
• 
  Aquilegia canadensis L. Native AQCA

  red columbine · Ranunculaceae 83 counties
• 
  Aquilegia vulgaris L. Introduced AQVU

  European columbine · Ranunculaceae 4 counties
• 
  Arabidopsis thaliana (L.) Heynh. Introduced ARTH

  mouseear cress · Brassicaceae 31 counties
• 
  Arabis canadensis L. Native ARCA

  sicklepod · Brassicaceae 57 counties
• 
  Arabis drummondii A. Gray Native ARDR

  Drummond's rockcress · Brassicaceae 2 counties
• 
  Arabis glabra (L.) Bernh. Native ARGL

  tower rockcress · Brassicaceae 19 counties
• 
  Arabis hirsuta (L.) Scop. Native ARHI

  hairy rockcress · Brassicaceae 36 counties
• 
  Arabis hirsuta (L.) Scop. var. glabrata Torr. & A. Gray Native ARHIG

  mountain rockcress · Brassicaceae 1 county
• 
  Arabis hirsuta (L.) Scop. var. pycnocarpa (M. Hopkins) Rollins Native ARHIP

  creamflower rockcress · Brassicaceae 36 counties
• 
  Arabis laevigata (Muhl. ex Willd.) Poir. Native ARLA

  smooth rockcress · Brassicaceae 80 counties
• 
  Arabis laevigata (Muhl. ex Willd.) Poir. var. laevigata Native ARLAL

  smooth rockcress · Brassicaceae 80 counties
• 
  Arabis lyrata L. Native ARLY2

  lyrate rockcress · Brassicaceae 14 counties
• 
  Arabis missouriensis Greene Native ARMI5

  green rockcress · Brassicaceae 1 county
• 
  Arabis shortii (Fernald) Gleason Native ARSH2

  Short's rockcress · Brassicaceae 59 counties
• 
  Aralia elata (Miq.) Seem. Introduced AREL8

  Japanese angelica tree · Araliaceae 1 county
• 
  Aralia hispida Vent. Native ARHI2

  bristly sarsaparilla · Araliaceae 2 counties
• 
  Aralia nudicaulis L. Native ARNU2

  wild sarsaparilla · Araliaceae 24 counties
• 
  Aralia racemosa L. Native ARRA

  American spikenard · Araliaceae 67 counties
• 
  Aralia racemosa L. ssp. racemosa Native ARRAR

  American spikenard · Araliaceae 67 counties
• 
  Aralia spinosa L. Native ARSP2

  devil's walkingstick · Araliaceae 16 counties
• 
  Arctium lappa L. Introduced ARLA3

  greater burdock · Asteraceae 11 counties
• 
  Arctium minus Bernh. Introduced ARMI2

  lesser burdock · Asteraceae 74 counties
• 
  Arctium tomentosum Mill. Introduced ARTO

  woolly burdock · Asteraceae 4 counties
• 
  Arctostaphylos uva-ursi (L.) Spreng. Native ARUV

  kinnikinnick · Ericaceae 6 counties
• 
  Arenaria serpyllifolia L. Introduced ARSE2

  thymeleaf sandwort · Caryophyllaceae 43 counties
• 
  Arethusa bulbosa L. Native ARBU

  dragon's mouth · Orchidaceae 1 county
• 
  Argemone albiflora Hornem. Native ARAL3

  bluestem pricklypoppy · Papaveraceae 3 counties
• 
  Argemone albiflora Hornem. ssp. albiflora Native ARALA2

  bluestem pricklypoppy · Papaveraceae 3 counties
• 
  Argemone mexicana L. Native ARME4

  Mexican pricklypoppy · Papaveraceae 4 counties
• 
  Argentina anserina (L.) Rydb. Native ARAN7

  silverweed cinquefoil · Rosaceae 6 counties
• 
  Arisaema dracontium (L.) Schott Native ARDR3

  green dragon · Araceae 93 counties
• 
  Arisaema triphyllum (L.) Schott Native ARTR

  Jack in the pulpit · Araceae 102 counties
• 
  Arisaema triphyllum (L.) Schott ssp. pusillum (Peck) Huttleston Native ARTRP

  Jack in the pulpit · Araceae 2 counties
• 
  Arisaema triphyllum (L.) Schott ssp. triphyllum Native ARTRT3

  Jack in the pulpit · Araceae 102 counties
• 
  Aristida basiramea Engelm. ex Vasey Native ARBA2

  forked threeawn · Poaceae 14 counties
• 
  Aristida desmantha Trin. & Rupr. Native ARDE3

  curly threeawn · Poaceae 5 counties