Section 1050.40 Threatened
Flora of Illinois
All federally designated
endangered or threatened plant species and subspecies have been automatically
placed on the Illinois List by the Board and are protected under the Illinois
Endangered Species Protection Act even though their names do not appear in this
Part. Only those federally designated endangered or threatened plant species
and subspecies known to occur in Illinois are designated as Illinois-endangered
or Illinois-threatened by the Board and their names appear in this Part. Users
should refer to the US Fish and Wildlife Service at https://www.fws.gov/program/endangered-species/
for a complete listing of all federally designated endangered and threatened
species and subspecies.
SCIENTIFIC
NAME COMMON NAME
a) FERNS AND ALLIES
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Equisetum pratense
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Meadow Horsetail
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Huperzia porophila
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Cliff Clubmoss
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b) ANGIOSPERMS – DICOTS
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Agalinis skinneriana
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Pale False Foxglove
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Amelanchier interior
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Shadbush
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Boltonia decurrens*
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Decurrent False Aster
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Buchnera americana
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Bluehearts
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Cakile edentula var. lacustris
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Sea Rocket
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Chamaedaphne calyculata
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Leatherleaf
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Dodecatheon frenchii
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French's Shootingstar
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Drosera intermedia
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Narrow-leaved Sundew
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Euonymus americanus
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American Strawberry Buh
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Euphorbia polygonifolia
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Seaside Spurge
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Eurybia furcate
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Forked Aster
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Filipendula rubra
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Queen-of-the-Prairie
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Hylotelephium telephioides
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American Orpine
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Lathryus ochroleucus
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Pale Vetchling
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Melothria pendula
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Squirting Cucumber
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Menyanthes trifoliata
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Buckbean
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Minuartia patula
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Slender Sandwort
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Monarda clinopodia
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White Bergamot
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Orobanche ludoviciana
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Broomrape
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Oxalis illinoensis
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Illinois Wood Sorrel
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Phemeranthus parviflorus
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Small Flower-of-an-hour
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Planera aquatica
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Water Elm
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Quercus montana
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Rock Chestnut Oak
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Quercus phellos
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Willow Oak
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Ranunculus harveyi
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Harvey's Buttercup
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Rubus pubescens
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Dwarf Raspberry
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Rubus setosus
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Bristly Blackberry
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Rudbeckia missouriensis
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Missouri Orange Coneflower
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Salvia azurea var.grandiflora
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Blue Sage
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Solidago sciaphila
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Cliff Goldenrod
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Styrax americanus
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Storax
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Sullivantia sullivantii
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Sullivantia
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Synandra hispidula
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Hairy Synandra
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Synthyris bullii
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Kitten Tails
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Trifolium reflexum
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Buffalo Clover
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Urtica chamaedryoides
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Nettle
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Utricularia intermedia
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Flat-leaved Bladderwort
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Veronica scutellata
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Marsh Speedwell
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Viburnum molle
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Arrowwood
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c) ANGIOSPERMS – MONOCOTS
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Ammophila breviligulata
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Marram Grass
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Carex atlantica
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Sedge
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Carex aurea
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Golden Sedge
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Carex bromoides
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Sedge
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Carex cryptolepsis
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Yellow Sedge
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Carex intumescens
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Swollen Sedge
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Carex oxylepis var. oxylepis
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Sharp-scaled Sedge
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Carex prasina
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Drooping Sedge
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Carex viridula
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Little Green Sedge
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Carex willdenowii
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Willdenow's Sedge
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Cyperus grayoides
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Umbrella Sedge
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Cyperus lancastriensis
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Galingale
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Eleocharis rostellata
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Beaked Spike Rush
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Festuca paradoxa
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Cluster Fescue
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Juncus alpinoarticulatus
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Richardson's Rush
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Platanthera flava var. flava
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Tubercled Orchid
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Potamogeton gramineus
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Grass-leaved Pondweed
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Schoenoplectiella hallii
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Hall's Bulrush
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Stenanthium gramineum
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Grass-leaved Lily
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Triantha glutinosa
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False Asphodel
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Triglochin maritima
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Common Bog Arrowgrass
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Triglochin palustris
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Slender Bog Arrowgrass
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Uvularia floridana
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Florida Bellwort
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d) LICHEN
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Phaeophyscia leana
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Lea's Bog Lichen
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* Federally designated threatened species
** Federally designated endangered species.
(Source: Amended at 49 Ill.
Reg. 14774, effective October 30, 2025)