Flora of Ohio

Helianthus × brevifolius is a hybrid perennial species of sunflower in the family Asteraceae. It is native to N. Central & NE. U.S.A., including Ohio. Hybrid formula is H. grosseserratus × H. mollis.

Aconitum noveboracense, also known as northern blue monkshood or northern wild monkshood, is a flowering plant belonging to the buttercup family (Ranunculaceae). Members of its genus (Aconitum) are also known as wolfsbane. A. noveboracense is listed as a threatened species by the United States Fish and Wildlife Service. The species can only be found in Iowa, Wisconsin, Ohio, and New York, and populations have been in decline since the 1980s. A narrow set of environmental conditions for growth limit the plant to these areas, so a species recovery plan has been set in place to preserve the

Tetraneuris herbacea is a rare species of flowering plant in the aster family known by the common names eastern fournerved daisy, lakeside daisy, fournerved starflower, and Manitoulin gold. It is native to and endemic to the Great Lakes region in North America, where it is present in Ontario, Ohio, Michigan, and Illinois. It is threatened by habitat destruction and degradation by several forces, including limestone quarrying, recreational activity, fire suppression, and construction. It is a federally listed threatened species of the United States and of Canada.

Cornus × arnoldiana, the Arnold dogwood, is a hybrid dogwood native to eastern North America. It is reported from Ontario, Missouri, Ohio, Pennsylvania, and Massachusetts. It is a member of the dogwood genus Cornus and the family Cornaceae. Arnold dogwood is derived from natural crosses between silky dogwood (Cornus amomum) and gray dogwood (Cornus racemosa). Intermediate shrubs were first noted in the Arnold Arboretum by Alfred Rehder, who described and named the hybrid. The name is an allusion to the place of its discovery.

Helianthus ambiguus is a North American species of sunflower known by the common name ambiguous sunflower. It is found only in the Great Lakes region of the United States, the states of New York, Michigan, Ohio, and Wisconsin.

Carex juniperorum, the juniper sedge, is a perennial flowering plant native to North America, first described by botanist William J. Crins in 1993. C. juniperorum is in the Cyperaceae (sedge) family, and is closely related to C. jamesii and C. willdenowii. It is commonly called juniper sedge as it is often seen growing in areas with red cedar (Juniperus virginiana), though the presence of cedar is not necessarily a requirement for it to grow.

Antennaria virginica is a North American species of flowering plants in the family Asteraceae known by the common names shalebarren pussytoes. It grows on Devonian shale in the eastern United States. It is found in central Appalachian Mountains of Pennsylvania, Maryland, West Virginia, and Virginia, with a few populations in eastern Ohio. Antennaria virginica grows up to 25 cm (10 inches) tall, spreading by horizontal stems that run along the surface of the ground. Male and female flower heads are borne on separate plants. One plant can have several heads in a flat-topped array.

Trollius laxus is a rare flowering plant species in the buttercup family, Ranunculaceae. It is native to North America and is considered to have two subspecies, one with a distribution is the east and one in the west. Common names for Trollius laxus include American globeflower and American spreading globeflower. The American Globeflower, Trollius laxus is an endangered species of flowering plants Native to Northeastern United States. This species of plants is limited in range by their ability to exclusively survive in wetlands and marshes. Thus, clusters of the species are constantly

Silene rotundifolia, the roundleaf catchfly, is a species of flowering plant in the family Caryophyllaceae, native to the east-central United States. A perennial, it is typically found in woodlands to the west of the Appalachians, on cliffs and bluffs. It is closely related to Silene laciniata.

Hieracium traillii is a species of hawkweed known by the common name Maryland hawkweed. Hieracium traillii grows in the eastern United States, primarily in the central Appalachian Mountains of Pennsylvania, Maryland, Virginia, and West Virginia, with some populations farther west in Ohio and Kentucky. Hieracium traillii is a small hawkweed forming a basal rosette of densely hairy gray-green leaves, each up to 8 centimeters (3.2 inches) long and some with toothed edges. It bolts a thin, hairy stem which reaches 60 centimeters (2 feet) tall. The stem bears an inflorescence of several flower

Spiranthes × kapnosperia, the smoky ladies' tresses, is a species of orchid growing in the Eastern United States. This species is documented in New York (state), Ohio, Illinois, Tennessee, North Carolina, and South Carolina.

Crataegus persimilis is a species of hawthorn, known by the common names plumleaf hawthorn and broad-leaved cockspur thorn, native to southern Ontario, Canada, and the US states of New York, Pennsylvania, Ohio, Kentucky, West Virginia, and Virginia. It is widely cultivated, particularly in Europe, as an ornamental. Its sporadic distribution in its natural range and certain of its morphological characters leads authorities to consider it a probable naturally occurring hybrid, with its most likely parents being Crataegus succulenta (fleshy hawthorn) and Crataegus crus-galli (cockspur hawthorn).

Crataegus pennsylvanica, known as the Pennsylvania thorn, is a species of hawthorn native to Delaware, New York, North Carolina, Ontario, Ohio, and Pennsylvania, that grows to about 8 m in height. The mature trees have few thorns. This species has often been confounded with C. mollis, but the two species have separate native ranges except for an area of overlap in northeastern Ohio.

Veronica bullii is a species of flowering plant in the plantain family known by the common names kittentails and Bull's coraldrops. It is native to the Upper Midwest of the United States, including the states of Ohio, Indiana, Illinois, Wisconsin, Iowa, and Minnesota.

Cardamine dissecta is a species of flowering plant in the mustard family Brassicaceae.

Eupatorium godfreyanum, commonly called Godfrey’s thoroughwort, is a North American species of plants in the family Asteraceae. It is found in the east-central United States, primarily from Pennsylvania to North Carolina, with a few isolated populations west of the Appalachians in Ohio, Kentucky, and Tennessee. Chromosomal analysis suggests that E. godfreyanum originated as a hybrid between E. rotundifolium and E. sessilifolium. Eupatorium godfreyanum does, however, reproduce on its own and can be found in areas where neither parent species is present. Thus it deserves full recognition as a

Gilia capitata is a species of flowering plant in the phlox family known by the common names blue-thimble-flower, bluehead gilia, blue field gilia, and globe gilia.

Viola tripartita is a species of violet known by the common name threepart violet. It is native to Eastern North America, being primarily found in the Southern Appalachian Mountains. Its preferred habitat is rich, mesic forests over calcareous rocks. It is a small perennial herb that has yellow flowers in the spring. It is distinguished from other caulescent yellow violets native to the area by having leaves that are wider than long which have a cuneate base.

Euphorbia purpurea is a species of Euphorbia known by the common names Darlington's glade spurge, glade spurge, and purple spurge. It is native to the Eastern United States, where it occurs from Ohio and Pennsylvania south to North Carolina. It has been extirpated from Alabama; it was believed lost from Delaware until a population was rediscovered in 1997. This perennial herb grows from a rhizome and reaches a maximum height around one meter. It has slightly hairy, oppositely arranged leaves up to 3 centimeters long. The bracts are purplish in color, giving the plant its name. The bumpy fruit

Leavenworthia uniflora, called Michaux's gladecress or one-flowered gladecress, is a plant species native to the southeastern and Midwestern parts of the United States. It is reported from northwestern Georgia, northern Alabama, Tennessee, northern Arkansas, southern Missouri, Kentucky, southeastern Indiana, southwestern Ohio, and northwestern Virginia. It grows in open, sun-lit locations at elevations less than 500 meters (1700 feet). Leavenworthia uniflora is an herb up to 20 cm (8 inches) tall. Basal leaves are up to 13 cm (5.2 inches) long, pinnately lobed with 3-10 pairs of lobes.

Collinsonia verticillata is a species of flowering plant in the mint family known by the common names stoneroot, early stoneroot, whorled stoneroot, and whorled horse-balm. It is native to the United States, where it occurs in the southeastern states, especially the southern Appalachian Mountains, its distribution extending north to Ohio. This rhizomatous herb has two to three pairs of leaves and an unbranched inflorescence bearing white, pink, or lavender flowers, each with four stamens. The plant grows in rich soils in mountain forests. Besides this, very little is known about this species.

Paxistima canbyi is a species of small broadleaf evergreen shrub or groundcover that is usually about one foot (0.30 m) high, but can grow up to almost three feet (0.91 m) high. It is in the family Celastraceae, and is known by the common names of Canby's mountain-lover, rat-stripper, ratstripper, Canby paxistima, or cliff green.

Napaea is a monotypic genus of flowering plants in the mallow family Malvaceae. The single species is Napaea dioica, a tall perennial herbaceous plant, native to central and eastern USA. Plants are occasionally grown as ornamentals in wildflower gardens. A common name is glade mallow.

Asplenium × kentuckiense, commonly known as Kentucky spleenwort, is a rare, sterile, hybrid fern. It is formed by the crossing of lobed spleenwort (A. pinnatifidum) with ebony spleenwort (A. platyneuron). Found intermittently where the parent species grow together in the eastern United States, it typically grows on sandstone cliffs, but is known from other substrates as well.

Orbexilum onobrychis, commonly called French-grass or lanceleaf scurfpea, is a species of flowering plant in the legume family (Fabaceae). It is native to the eastern United States where its range is concentrated in the Midwest and Upper South. Its natural habitat is primarily prairies and riverbanks, typically in mesic or wet areas. It is an uncommon species, and can be found in high-quality prairie remnants as well as more disturbed areas. It is a rhizomatous perennial that forms large colonies. It has pinnately trifoliate leaves, with large lanceolate leaflets. Its flowers are pale blue or

Quercus ellipsoidalis, the northern pin oak or Hill's oak, is a North American species of oak tree native to the north-central United States and south-central Canada, primarily in the Great Lakes region and the Upper Mississippi Valley. It most commonly occurs on dry, sandy soils.

Trifolium stoloniferum, the running buffalo clover, is an endangered species of perennial clover native to the eastern and midwestern United States.

Prosartes maculata is a North American species of plants in the lily family with the common names yellow mandarin, spotted mandarin, or nodding mandarin. It is a perennial plant that flowers in the spring. It is a native plant of the Great Smoky Mountains and occurs in other parts of the Appalachian region from northern Georgia and northeastern Alabama to southern West Virginia and southern Ohio. There are old reports of isolated populations from near Detroit, Michigan, but these appear now to have been lost to urban development. Prosartes maculata is a herb that grows up to 80 cm tall. Its

Synandra is a monotypic genus of flowering plants in the mint family containing the single species Synandra hispidula, which is known by the common name Guyandotte beauty. It is native to the east-central United States where it ranges from southern Illinois to western North Carolina and Virginia.

Phacelia ranunculacea, the oceanblue phacelia or western buttercup phacelia, is a North American species of annual forbs in the borage family. It is native to a small area of the eastern United States in the valleys of the Mississippi River and lower Ohio River. In this region, it is found in bottomland and floodplain forests. It produces a pale blue flower in early spring. Phacelia ranunculacacea was previously considered a synonym of Phacelia covillei, but was separated from it in 2006 based on chromosomal, morphological, and geographical evidence. P. ranunculacacea differs from P. covillei