List of Vascular Plants Found at the Savanna Army Depot

Kenneth R. Robertson, Loy R. Phillippe, Geoffey A. Levin, and Michael J. Moore

Center for Biodiversity
Illinois Natural History Survey
607 East Peabody Drive
Champaign, IL 61820 USA

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Genera beginning with E - P are given below.

Go to A - D

Go to Q - Z

Annotated List of Vascular Plants at the Savanna Army Depot. Arranged alphabetically by scientific name. This list includes only species we observed during 1996, except for Polygala verticillata, which was collected in 1993 and Orobanche fasciculata (Orobanchaceae), which was last collected at the Depot in 1908 although suitable habitat is still extant. Under "Scientific Names", the authorities are omitted for brevity; they are included on the voucher specimens cited in Table 2. Under "E/T", E = State Endangered, T = State Threatened, FCC = former Federal Candidate Category 2, ND = Newly Discovered in Illinois and likely to qualify for listing as a state endangered species.

Scientific Name

Scientific Name	Common Name	Family	Native or Introduced	Frequency and Habitat	E/T
Echinacea pallida	Pale Coneflower	Asteraceae	native	Only one plant seed in dry-mesic prairie	--
Echinochloa crusgalli	Barnyard Grass	Poaceae	introduced	Occasional in developed land and wet-mesic bottomland forest	--
Echinochloa muricata	Barnyard-grass	Poaceae	native	Infrequent in wet-mesic floodplain forest	--
Echium vulgare	Blueweed	Boraginaceae	introduced	Occasional in developed land	--
Eclipta prostrata	Yerba-de-tajo	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Elaeagnus angustifolia	Russian Olive	Elaeagnaceae	introduced	Occasional in sand forest and sand savanna and infrequent in sand prairie	--
Eleocharis acicularis	Spikerush	Cyperaceae	native	Occasional in ponds and wet-mesic floodplain forest	--
Eleocharis erythropoda	Spike-rush	Cyperaceae	native	Occasional in wet-mesic bottomland forest	--
Eleocharis obtusa	Spike Rush	Cyperaceae	native	Occasional in natural sand pond and in wet-mesic bottomland forest	--
Ellisia nyctelea	Ellisia	Hydrophyllaceae	native	Occasional in sand forest	--
Elodea nuttallii	Free-flowered Water-weed	Hydrocharitaceae	native	Occasional as aquatic in Mississippi River	--
Elymus canadensis	Nodding Wild Rye	Poaceae	native	Occasional in sand prairie	--
Elymus virginicus	Virginia Wild Rye	Poaceae	native	Occasional in wet-mesic bottomland forest	--
Epilobium ciliatum	American Willow-herb	Onagraceae	native	Infrequent in wet-mesic floodplain forest	--
Equisetum arvense	Common Horsetail	Equisetaceae	native	Occasional in wet-mesic floodplain forest	--
Equisetum hyemale var. affine	Scouring Rush	Equisetaceae	native	Occasional in developed land and sand prairie	--
Equisetum laevigatum	Smooth Scouring Rush	Equisetaceae	native	Occasional in sand prairie and sand savanna	--
Equisetum pratense	Meadow Horsetail	Equisetaceae	native	Rare in sand forest	E
Equisetum x ferrissii	Scouring Rush	Equisetaceae	native	Occasional in sand prairie	--
Eragrostis cilianensis	Stink-grass	Poaceae	introduced	Occasional in developed land and infrequent in sand prairie	--
Eragrostis hypnoides	Annual Lovegrass	Poaceae	native	Occasional in wet-mesic floodplain forest	--
Eragrostis pectinacea	Small Love Grass	Poaceae	native	Occasional in developed land and successional field	--
Eragrostis poaeoides	Low Love Grass	Poaceae	introduced	Occasional in developed land	--
Eragrostis spectabilis	Tumblegrass	Poaceae	native	Occasional in sand forest, sand prairie, and sand savanna	--
Eragrostis trichoides	Sand-lovegrass	Poaceae	native	Infrequent in sand prairie	--
Erechtites hieracifolia	Fireweed	Asteraceae	native	Occasional in sand forest, sand savanna, and wet-mesic floodplain forest	--
Erigeron annuus	Daisy Fleabane	Asteraceae	native	Occasional in sand forest	--
Erigeron philadelphicus	Marsh Fleabane	Asteraceae	native	Occasional in sand forest	--
Erigeron strigosus	Daisy Fleabane	Asteraceae	native	Occasional in sand prairie and sand savanna; infrequent in sand forest	--
Erysimum inconspicuum	Treacle Mustard	Brassicaceae	introduced	Occasional in developed land, sand prairie and sand savanna	--
Euonymus atropurpurea	Wahoo	Celastraceae	native	Occasional in sand forest	--
Eupatorium perfoliatum	Common Boneset	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Eupatorium purpureum	Spotted Joe-Pye-weed	Asteraceae	native	Occasional in sand forest border with wet-mesic floodplain forest	--
Eupatorium rugosum	White Snakeroot	Asteraceae	native	Occasional in sand forest; infrequent in sand savanna	--
Eupatorium serotinum	Late Boneset	Asteraceae	native	Infrequent in pastureland and sand forest	--
Euphorbia corollata	Flowering Spurge	Euphorbiaceae	native	Frequent in sand prairie and sand savanna; occasional in sand forest	--
Euphorbia dentata	Toothed Spurge	Euphorbiaceae	native	Occasional in developed land; infrequent in sand savanna	--
Euphorbia esula	Leafy Spurge	Euphorbiaceae	introduced	Rare in sand prairie	--
Festuca elatior	Tall Fescue	Poaceae	introduced	Occasional in developed land	--
Festuca obtusa	Nodding Fescue	Poaceae	native	Occasional in sand forest and sand savanna	--
Festuca ovina	Slender Fescue	Poaceae	introduced	Infrequent in sand prairie	--
Festuca pratensis	Meadow Fescue	Poaceae	introduced	Infrequent in developed land	--
Fragaria virginiana	Wild Strawberry	Rosaceae	native	Occasional in sand forest and sand savanna	--
Fraxinus pennsylvanica	Green Ash	Oleaceae	native	Frequent in sand forest, sand savanna, and wet-mesic floodplain forest. Infrequent in sand prairie	--
Froelichia floridana var. campestris	Cottonweed	Amaranthaceae	native	Occasional in sand prairie and sand savanna	--
Froelichia gracilis	Small Cottonweed	Amaranthaceae	introduced	Occasional in successional fields; infrequent in sand prairie and sand savanna	--
Galearis spectabilis	Showy Orchis	Orchidaceae	Native	Infrequent in sand forest	--
Galium aparine	Goosegrass	Rubiaceae	natve	Occasional in sand forest	--
Galium circaezans	Forest-bedstraw	Rubiaceae	native	Occasional in sand forest	--
Galium concinnum	Shining Bedstraw	Rubiaceae	native	Occasional in sand forest, sand savanna, and successional field	--
Galium triflorum	Sweet-scented Bedstraw	Rubiaceae	native	Occasional in sand forest and wet-mesic floodplain forest	--
Gaura longiflora	Gaura	Onagraceae	native	Infrequent in sand savanna and wet-mesic floodplain forest	--
Geranium carolinianum	Wild Cranesbill	Geraniaceae	native	Infrequent in sand forest, sand prairie, and sand savanna	--
Geranium maculatum	Wild Geranium	Geraniaceae	native	Infrequent in dry upland forest	--
Geum canadense	White Avens	Rosaceae	native	Occasional in sand forest	--
Geum triflorum	Prairie Smoke	Rosaceae	native	Infrequent in sand prairie	--
Gleditsia triacanthos	Honey Locust	Fabaceae	native	Occasional in sand forest, sand prairie, sand savanna, and wet-mesic floodplain forest	--
Glyceria striata var. striata	Fowl Manna Grass	Poaceae	native	Occasional in wet-mesic floodplain forest	--
Gnaphalium obtusifolium	Fragrant Cudweed	Asteraceae	native	Occasional in sand prairie and sand savanna	--
Gratiola neglecta	Clammy Hedge Hyssop	Scrophulariaceae	native	Infrequent in pond margins and wet-mesic floodplain forest	--
Grindelia squarrosa var. squarrosa	Curlycup-gumweed	Asteraceae	native	Infrequent in sand prairie	--
Gymnocladus dioicus	Kentucky Coffeetree	Fabaceae	native	Occasional in wet-mesic floodplain forest; Infrequent in sand forest	--
Hackelia virginiana	Stickseed	Boraginaceae	native	Occasional in sand forest and sand savanna	--
Hedeoma hispida	Rough Pennyroyal	Lamiaceae	native	Frequent in sand prairie and sand savanna	--
Helenium autumnale	Common Sneezeweed	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Helianthemum bicknellii	Frostweed	Cistaceae	native	Occasional in sand prairie and sand savanna	--
Helianthemum canadense	Common Rockrose	Cistaceae	native	Occasional in sand prairie and sand savanna	--
Helianthus annuus	Common Sunflower	Asteraceae	introduced	Infrequent in successional fields and sand forest; rare in sand prairie	--
Helianthus hirsutus	Hairy Sunflower	Asteraceae	native	Occasional in sand forest	--
Helianthus mollis	Ashy Sunflower	Asteraceae	native	Infrequent in sand prairie	--
Helianthus occidentalis	Western Sunflower	Asteraceae	native	Occasional in sand prairie	--
Helianthus rigidus	Stiff Sunflower	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Helianthus tuberosus	Jerusalem-artichoke	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Heliopsis helianthoides	False Sunflower	Asteraceae	native	Infrequent in sand savanna	--
Hemerocallis fulva	Daylily	Liliaceae	introduced	Infrequent in disturbed area of sand forest	--
Heracleum lanatum	Cow Parsnip	Apiaceae	native	Infrequent in wet-mesic floodplain forest	--
Heteranthera dubia	Water Star-grass	Pontederiaceae	native	Occasional aquatic in Mississippi River	--
Heterotheca camporum	Golden Aster	Asteraceae	native	Frequent in sand prairie; occasional in sand savanna	--
Hibiscus laevis	Smooth Rose-mallow	Malvaceae	native	Occasional in wet-mesic floodplain forest	--
Hieracium longipilum	Hairy Hawkweed	Asteraceae	native	Occasional in sand prairie	--
Holosteum umbellatum	Jagged Chickweed	Caryophyllaceae	introduced	Frequent in developed land and occasional sand prairie	--
Hordeum jubatum	Squirrel-tail Grass	Poaceae	introduced?	Occasional in developed land and pastureland	--
Hudsonia tomentosa	False Heather	Cistaceae	native	Occasional in sand prairie and sand savanna	E
Humulus japonicus	Japanese Hops	Moraceae	introduced	Rare in sand savanna	--
Humulus lupulus	Hops	Moraceae	native	Infrequent in sand forest	--
Hydrophyllum virginianum	Great Waterleaf	Hydrophyllaceae	native	Occasional in wet-mesic floodplain forest	--
Hypericum perforatum	Common St. John's-wort	Clusiaceae	native	Infrequent in sand prairie	--
Hypericum punctatum	Spotted St. John's-wort	Clusiaceae	native	Occasional in wet-mesic bottomland forest	--
Hypericum sphaerocarpum	Round-fruited St. John's-wort	Clusiaceae	native	Infrequent in sand forest	--
Impatiens capensis	Orange Touch-me-not	Balsaminaceae	native	Occasional in wet-mesic floodplain forest	--
Impatiens pallida	Pale Touch-me-not	Balsaminaceae	native	Occasional in wet-mesic floodplain forest	--
Iris shrevei	Blue Flag	Iridaceae	native	Occasional along oxbow lake and in wet-mesic bottomland forest	--
Juglans cinerea	White Walnut	Juglandaceae	native	Occasional in sand forest	--
Juglans nigra	Black Walnut	Juglandaceae	native	Frequent in sand forest, sand savanna, and occasional in sand prairie	--
Juncus interior	Inland Rush	Juncaceae	native	Occasional in wet-mesic floodplain forest	--
Juncus tenuis	Path Rush	Juncaceae	native	Occasional in developed land	--
Juniperus virginiana	Red Cedar	Cupressaceae	native	Frequent in sand savanna, occasional in sand forest and sand prairie	--
Koeleria macrantha	June Grass	Poaceae	native	Frequent in sand prairie and sand savanna	--
Krigia virginica	Dwarf Dandelion	Asteraceae	native	Frequent in sand prairie and sand savanna; occasional in sand forest	--
Kummerowia stipulacea	Korean Clover	Fabaceae	intord	Occasional in developed land and successional fields	--
Lactuca canadensis	Tall Lettuce	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Lactuca floridana	Woodland Lettuce	Asteraceae	native	Occasional in wet-mesic floodplain forest	--
Lactuca serriola	Prickly Lettuce	Asteraceae	introduced	Infrequent in developed land	--
Laportea canadensis	Wood Nettle	Urticaceae	native	Frequent in wet-mesic bottomland forest	--
Lappula echinata	Beggar's Lice	Boraginaceae	introduced	Infrequent in sand prairie and in pasture	--
Lechea pulchella	Pretty Pinweed	Cistaceae	native	Occasional in sand prairie and sand savanna	--
Lechea tenuifolia	Slender-leaved Pinweed	Cistaceae	native	Occasional in sand prairie and sand savanna	--
Leersia oryzoides	Rice Cut-grass	Poaceae	native	Occasional in wet-mesic floodplain forest	--
Leersia virginica	White Grass	Poaceae	native	Frequent in wet-mesic bottomland forest	--
Lemna minor	Lesser Duckweed	Lemnaceae	native	Frequent on water of ponds and Mississippi river (aquatic)	--
Leonurus cardiaca	Motherwort	Lamiaceae	introduced	Occasional in sand forest and sand savanna	--
Lepidium campestre	Field Peppergrass	Brassicaceae	introduced	Occasional to locally frequent in developed land and sand prairie	--
Lepidium densiflorum	Small Peppergrass	Brassicaceae	introduced	Frequent in sand prairie and sand savanna	--
Lepidium virginicum	Common Peppergrass	Brassicaceae	native	Abundant in sand prairie and sand savanna	--
Leptoloma cognatum	Fall Witch Grass	Poaceae	native	Frequent in sand prairie and sand savanna	--
Lespedeza capitata	Round-headed Bush-clover	Fabaceae	native	Occasional in sand forest, sand prairie, and sand savanna	--
Lespedeza intermedia	Wand-lespedeza	Fabaceae	native	Occasional in sand forest	--
Liatris aspera	Rough Blazing-star	Asteraceae	native	Locally frequent in sand prairie; occasional in sand savanna; infrequent in sand forest	--
Linaria canadensis	Blue Toadflax	Scrophulariaceae	native	Occasional in sand prairie and sand savanna	--
Linaria vulgaris	Butter-and-eggs	Scrophulariaceae	introduced	Infrequent in developed land	--
Lindernia dubia var. dubia	False Pimpernel	Scrophulariaceae	native	Occasional in wet-mesic floodplain forest	--
Linum sulcatum	Yellow Flax	Linaceae	native	Occasional in sand prairie and sand savanna	--
Liparis liliifolia	Large Twayblade	Orchidaceae	native	Rare in wet-mesic floodplain forest	--
Lithospermum caroliniense	Hairy Puccoon	Boraginaceae	native	Occasional in sand prairie and sand savanna	--
Lithospermum incisum	Fringed Puccoon	Boraginaceae	native	Occasional in sand prairie and sand savanna	--
Lobelia cardinalis	Cardinal Flower	Campanulaceae	native	Occasional in wet-mesic bottomland forest	--
Lobelia inflata	Indian Tobacco	Campanulaceae	native	Infrequent in wet-mesic floodplain forest and sand forest	--
Lobelia siphilitica	Blue Lobelia	Campanulaceae	native	Occasional in wet-mesic floodplain forest	--
Lolium perenne	Perennial Rye Grass	Poaceae	introduced	Occasional in developed land	--
Lonicera morrowii	Bush Honeysuckle	Caprifoliaceae	introduced	Occasional in sand forest	--
Lonicera tatarica	Tartarian Honeysuckle	Caprifoliaceae	introduced	Occasional in sand forest and sand savanna	--
Lycopus americanus	Common Water Horehound	Lamiaceae	native	Occasional in wet-mesic floodplain forest	--
Lycopus uniflorus	Northern Water-horehound	Lamiaceae	native	Occasional in wet-mesic bottomland forest	--
Lysimachia ciliata	Fringed Loosestrife	Primulaceae	native	Occasional in wet-mesic bottomland forest	--
Lythrum salicaria	Purple Loosestrife	Lythraceae	introduced	Rare in open edge of Mississippi River (wet-mesic floodplain forest)	--
Malus coronaria	Wild Sweet Crab	Rosaceae	native	Infrequent in sand prairie	--
Malus ioensis	Iowa Crab	Rosaceae	native	Occasional in sand forest, sand prairie, and sand savanna	--
Malus pumila	Apple	Rosaceae	introduced	Infreauent in dry upland forest and wet-mesic floodplain forest	--
Malva neglecta	Common Mallow	Malvaceae	introduced	Infrequent in disturbed wet-mesic floodplain forest	--
Matricaria matricarioides	Pineapple-weed	Asteraceae	introduced	Infrequent in successional field	--
Medicago lupulina	Black Medic	Fabaceae	introduced	Occasional in developed land	--
Melilotus alba	White Sweet Clover	Fabaceae	introduced	Occasional in developed land and sand prairie	--
Melilotus officinalis	Yellow Sweet Clover	Fabaceae	introduced	Frequent in successional field, occasional in sand prairie and sand savanna	--
Menispermum canadense	Moonseed	Menispermaceae	native	Occasional in sand forest	--
Mentha arvensis var. villosa	Field Mint	Lamiaceae	introduced	Occasional in wet-mesic floodplain forest	--
Mimulus ringens	Allegheny Monkey-flower	Scrophulariaceae	native	Infrequent in wet-mesic floodplain forest	--
Mirabilis hirsuta	Hairy Umbrella Wort	Nyctaginaceae	native	Infrequent in sand savanna and sand forest	E
Mirabilis nyctaginea	Wild Four O'Clock	Nyctaginaceae	introduced	Occasional in developed land and successional fields	--
Mollugo verticillatus	Carpetweed	Molluginaceae	introduced	Frequent in sand forest, sand prairie, sand savanna, and successional field	--
Monarda fistulosa	Wild Bergamot	Lamiaceae	native	Occasional in sand savanna and wet-mesic bottomland forest	--
Monarda fistulosa var. mollis	Wild Bergamot	Lamiaceae	native	Infrequent in sand savanna	--
Monarda punctata	Horsemint	Lamiaceae	native	Frequent in sand prairie and sand savanna; occasonal in sand forest	--
Morus alba	White Mulberry	Moraceae	introduced	Infrequent in sand forest and sand savanna	--
Muhlenbergia mexicana	Western Muhly	Poaceae	native	Occasional in wet-mesic floodplain forest	--
Muhlenbergia racemosa	Muhly	Poaceae	native	Infrequent in sand forest, sand prairie, and sand savanna	--
Muhlenbergia schreberi	Nimblewill	Poaceae	native	Occasional in sand forest and wet-mesic floodplain forest	--
Myosoton aquaticum	Water Chickweed	Caryophyllaceae	introduced	Occasional in wet-mesic floodplain forest	--
Myriophyllum spicatum	European Water-milfoil	Haloragidaceae	introduced	Infrequent aquatic in Mississippi River	--
Najas minor	Naiad	Najadaceae	native	Occasional aquatic in Oxbow Lake and Mississippi River	--
Nelumbo lutea	American Lotus	Nelumbonaceae	native	Occasional as aquatic in Mississippi River	--
Nepeta cataria	Catnip	Lamiaceae	introduced	Occasional in developed land and sand savanna	--
Nymphaea tuberosa	Water-lily	Nymphaeaceae	native	Occasional aquatic in Mississippi River	--
Oenothera biennis	Common Evening-primrose	Onagraceae	native	Infrequent in wet-mesic bottomland forest	--
Oenothera laciniata	Ragged Evening Primrose	Onagraceae	native	Infrequent in disturbed sand prairie	--
Oenothera rhombipetala	Sand Primrose	Onagraceae	native	Occasional in sand forest; frequent in sand prairie and sand savanna	--
Onoclea sensibilis	Sensitive Fern	Dryopteridaceae	native	Occasional in sand forest and wet-mesic floodplain forest	--
Ophioglossum pusillum	Northern Adder's Tongue	Ophioglossaceae	native	Rare in wet-mesic floodplain forest	--
Opuntia fragilis	Fragile Prickly-pear	Cactaceae	native	Locally frequent in sand prairie	E
Opuntia macrorhiza	Prickly-pear	Cactaceae	native	Frequent in sand prairie and sand savanna	--
Orobanche fasciculata	Clustered Broomrape	Orobanchaceae	native	not observed at SAD since 1908, but suitable habitat still extant	E
Osmorhiza claytonii	Hairy Sweet Cicely	Apiaceae	native	Infrequent in sand forest	--
Osmorhiza longistylis	Smooth Sweet Cicely	Apiaceae	native	Infrequent in sand forest	--
Osmunda claytoniana	Interrupted Fern	Osmundaceae	native	Occasional in wet-mesic floodplain forest at its border with sand forest	--
Oxalis dillenii	Yellow Wood Sorrel	Oxalidaceae	native	Occasional in sand forest and sand savanna	--
Panicum capillare var capillare	Witch-grass	Poaceae	native	Infrequent in developed land and sand forest	--
Panicum depauperatum	Starved Panic Grass	Poaceae	native	Occasional in sand prairie and sand savanna	--
Panicum lanuginosum var. fasciculatum	Old-field Panic Grass	Poaceae	native	Occasional in sand forest	--
Panicum lanuginosum var. implicatum	Panic Grass	Poaceae	native	Occasional in sand prairie and sand savanna	--
Panicum linearifolium	Slender-leaved Panic Grass	Poaceae	native	Occasional in sand prairie and sand savanna	--
Panicum oligosanthes	Few-flowered Panic Grass	Poaceae	native	Occasional in sand forest, sand prairie and sand savanna	--
Panicum villosissimum	Hairy Panic Grass	Poaceae	native	Frequent to abundant in sand prairie and sand savanna	--
Panicum virgatum	Switch Grass	Poaceae	native	Frequent in sand prairie and sand savanna; occasional in sand forest	--
Parietaria pensylvanica	Pellitory	Urticaceae	native	Occasional in sand forest and sand savanna	--
Paronychia canadensis	Tall Forked Chickweed	Caryophyllaceae	native	Occasional in sand savanna	--
Paronychia fasitgiata	Forked Chickweed	Caryophyllaceae	native	Occasional in sand forest	--
Parthenocissus quinquefolia	Virginia Creeper	Vitaceae	native	Occasional in sand forest	--
Parthenocissus vitacea	Thicket Creeper	Vitaceae	native	Occasional in wet-mesic bottomland forest	--
Paspalum bushii	Hairy Bead Grass	Poaceae	native	Occasional in sand prairie and sand savanna	--
Paspalum ciliatifolium	Paspalum	Poaceae	introduced?	Occasional in sand prairie and sand savanna	--
Pastinaca sativa	Wild Parsnip	Apiaceae	introduced	Infrequent in successional fields	--
Penstemon pallidus	Pale Beardstongue	Scrophulariaceae	native	Occasional in sand forest, sand prairie and sand savanna	--
Penthorum sedoides	Ditch Stonecrop	Saxifragaceae	native	Occasional in wet-mesic bottomland forest	--
Petalostemum purpureum	Purple Prairie Clover	Fabaceae	native	Occasional in sand prairie	--
Phalaris arundinacea	Reed Canary Grass	Poaceae	introduced	Occasional in wet-mesic floodplain forest	--
Phlox divaricata subsp. laphamii	Blue Phlox	Polemoniaceae	native	Infrequent in sand forest border with wet-mesic floodplain forest	--
Phryma leptostachya	Lopseed	Verbenaceae	native	Occasional in sand forest	--
Phyla lanceolata	Fog-fruit	Verbenaceae	native	Occasional in wet-mesic bottomland forest	--
Physalis heterophylla	Ground Cherry	Solanaceae	native	Occasional in sand prairie and sand savanna	--
Physalis longifolia	Longleaf Ground-cherry	Solanaceae	native	Infrequent in wet-mesic floodplain forest	--
Physalis virginiana	Ground Cherry	Solanaceae	native	Frequent in sand prairie and sand savanna	--
Physocarpus opulifolius	Ninebark	Rosaceae	native	Rare in sand forest along Mississippi River	--
Physostegia virginiana	Obedient Plant	Lamiaceae	native	Occasional in wet-mesic bottomland forest	--
Pilea pumila	Clearweed	Urticaceae	native	Occasional in wet-mesic floodplain forest	--
Pinus banksiana	Jack Pine	Pinaceae	introduced in NW Illinois	Occasional in tree plantations and scattered trees in sand prairie and sand savanna	--
Pinus resinosa	Red Pine	Pinaceae	introduced in NW Illinois	Occasional in tree plantation	--
Plantago aristata	Bracted Plantain	Plantaginaceae	native?	Occasional in developed land	--
Plantago lanceolata	Dwarf Plantain	Plantaginaceae	introduced	Occasional in developed land	--
Plantago patagonica var brevicarpa	Salt-and-pepper Plant	Plantaginaceae	introduced?	Frequent in sand prairie and sand savanna	--
Plantago rugelii	Rugel's Plantain	Plantaginaceae	native	Occasional in developed land	--
Plantago virginica	Dwarf Plantain	Plantaginaceae	native	Occasional in developed land and successional field	--
Poa bulbosa	Bulbous Bluegrass	Poaceae	introduced	Rare in sand prairie	--
Poa compressa	Canadian Bluegrass	Poaceae	introduced	Occasional in sand forest, sand prairie and sand savanna	--
Poa palustris	Fowl Bluegrass	Poaceae	native	Rare in wet-mesic floodplain forest	--
Poa pratensis	Kentucky Bluegrass	Poaceae	introduced	Abundant in developed land and sand prairie and sand savanna	--
Podophyllum peltatum	Mayapple	Berberidaceae	native	Occasional in sand forest	--
Polanisia dodecandra	Clammyweed	Capparidaceae	native	Occasional in sand forest, sand prairie, and sand savanna	--
Polanisia jamesii	James' Clammyweed	Capparidaceae	native	Frequent in sand forest, sand prairie, and sand savanna	E
Polygala polygama var. obtusata	Purple Milkwort	Polygalaceae	native	Occasional in sand prairie and sand savanna	--
Polygala verticillata	Whorled Milkwort	Polygalaceae	native	Occasional in sand prairie	--
Polygonatum biflorum	Solomon's Seal	Liliaceae	native	Occasional in sand forest	--
Polygonatum cespitosum var. longisetum	Knotweed	Polygonaceae	introduced	Infrequent in successional field	--
Polygonella articulata	Jointweed	Polygonaceae	native	Occasional in sand prairie and sand savanna	--
Polygonum amphibium	Water Smartweed	Polygonaceae	native	Occasional in wet-mesic floodplain forest	--
Polygonum convolvulus	Black Bindweed	Polygonaceae	introduced	Occasional in sand forest and sand savanna	--
Polygonum hydropiper	Water-pepper	Polygonaceae	Introduced	Growing in wet-mesic floodplain forest	--
Polygonum lapathifolium	Dock-leaved Smartweed	Polygonaceae	native	Infrequent in wet-mesic floodplain forest	--
Polygonum pensylvanicum	Common Smartweed	Polygonaceae	native	Occasional in wet-mesic floodplain forest	--
Polygonum persicaria	Lady's Thumb	Polygonaceae	introduced	Occasional in wet-mesic floodplain forest	--
Polygonum punctatum	Dotted Smartweed	Polygonaceae	native	Occasional in wet-mesic floodplain forest	--
Polygonum ramosissimum	Knotweed	Polygonaceae	native	Occasional in sand prairie, sand savanna, and wet-mesic floodplain forest	--
Polygonum scandens	False Buckwheat	Polygonaceae	native	Occasional in sand forest, sand savanna, and successional field	--
Polygonum tenue	Slender Knotweed	Polygonaceae	native	Occasional in sand prairie and sand savanna	--
Polygonum virginianum	Jumpseed	Polygonaceae	native	Occasional in sand forest	--
Populus deltoides	Cottonwood	Salicaceae	native	Occasional in wet-mesic floodplain forest	--
Populus grandidentata	Big-tooth Aspen	Salicaceae	native	Occasional in sand forest and its border with wet-mesic floodplain forest	--
Populus tremuloides	Quaking Aspen	Salicaceae	native	Occasional in sand forest and sand savanna	--
Portulaca oleracea	Purslane	Portulacaceae	introduced	Infrequent in sand prairie	--
Potamogeton crispus	Curly Pondweed	Potamogetonaceae	introduced	Occasional aquatic in Mississippi River	--
Potamogeton nodosus	Long-leaved Pondweed	Potamogetonaceae	native	Occasional aquatic in pond and Mississippi River	--
Potamogeton pectinatus	Sago Pondweed	Potamogetonaceae	native	Occasional aquatic in Mississippi River	--
Potamogeton pusillus	Slender Pondweed	Potamogetonaceae	native	Occasional aquatic in Mississippi River	--
Potentilla argentea	Silvery Cinquefoil	Rosaceae	introduced	Frequent to Abundant in developed land and sand prairie; occasional in sand savanna	--
Potentilla inclinata	Hoary Cinquefoil	Rosaceae	introduced	Rare in successional field	--
Potentilla norvegica	Rough Cinquefoil	Rosaceae	native	Occasional in developed land and wet-mesic floodplain forest	--
Potentilla recta	Sulfur Cinquefoil	Rosaceae	introduced	Frequent in sand prairie and sand savanna; occasional in sand forest	--
Potentilla simplex	Old-field Cinquefoil	Rosaceae	native	Occasional in sand forest	--
Prunella vulgaris	Self-heal	Lamiaceae	introduced	Occasional in developed land and sand savanna	--
Prunus americana	Wild Plum	Rosaceae	native	Frequent in sand forest and sand savanna	--
Prunus nigra	Canadian Plum	Rosaceae	native	Rare in sand forest	--
Prunus serotina	Wild Black Cherry	Rosaceae	native	Occasional in sand forest and sand savanna	--
Prunus virginiana	Choke Cherry	Rosaceae	native	Occasional in sand forest and sand savanna	--
Ptelea trifoliata	Wafer Ash	Rutaceae	native	Occasional in sand forest, sand prairie, and sand savanna	--
Pteridium aquilinum	Bracken Fern	Dennstaedtiaceae	native	Infrequent in sand forest	--
Pycnanthemum virginianum	Mountain Mint	Lamiaceae	native	Infrequent in sand prairie	--