Flora of Northeastern U.S.

Carex oronensis is a species of sedge known by the common name Orono sedge. It is endemic to Maine in the United States, where it occurs mainly in the Penobscot River Valley. It is the only plant that is endemic to the state of Maine. The type locality is Orono. The Orono sedge produces clumps of stems up to one meter tall. There are three to four leaf blades per stem. Each measures 18 to 23 centimeters long. The copper-colored inflorescence is a few centimeters long and contains several spikes of flowers. Flowering occurs in June and July. This plant grows in wetlands and in less wet areas.

Platanthera pallida, commonly known as pale fringed orchid, is a rare orchid of North America with the only known occurrences on Long Island, where it is thought to be an endemic species. Locally, some enthusiasts prefer the alternative common name Long Island orchid.

Rubus prosper is a rare North American species of brambles in the rose family. It has been found in the State of Rhode Island in the northeastern United States. The genetics of Rubus is extremely complex, so that it is difficult to decide on which groups should be recognized as species. There are many rare species with limited ranges such as this. Further study is suggested to clarify the taxonomy.

Rubus is a large and diverse genus of flowering plants in the rose family, Rosaceae, subfamily Rosoideae, most commonly known as brambles. Fruits of various species are known as raspberries, blackberries, dewberries, and bristleberries. It is a diverse genus, with the estimated number of Rubus species varying from 250 to over 1000, found across all continents except Antarctica. Most of these plants have woody stems with prickles like roses; spines, bristles, and gland-tipped hairs are also common in the genus. The Rubus fruit, sometimes called a bramble fruit, is an aggregate of drupelets.

Rubus novanglicus is an uncommon North American species of flowering plant in the rose family. It grows in northeastern United States, having been found only in the State of Connecticut. The name "novanglicus" means "New England", referring to the six-state region of which Connecticut is a part. The genetics of Rubus is extremely complex, so that it is difficult to decide on which groups should be recognized as species. There are many rare species with limited ranges such as this. Further study is suggested to clarify the taxonomy. Some studies have suggested that R. novanglicus may have

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

Boltonia montana, the mountain doll's daisy, is a North American species of plants in the family Asteraceae. It is found only in the east-central part of the United States, in the states of New Jersey, Pennsylvania, and Virginia. Boltonia montana is a perennial herb up to 150 cm (60 inches) tall. It has many daisy-like flower heads with pink or lavender ray florets and yellow disc florets. Boltonia montana is critically imperiled in New Jersey and Virginia, and is possibly extirpated in Pennsylvania. In 2010, there were only 11 occurrences. The long term trend is a decline of 30-50%. It is

Solidago vossii is a flowering plant in the family Asteraceae known as Voss's goldenrod. It is endemic to Michigan in the United States. It was first formally named in 2010 by James Scott Pringle & Pamela J. Laureto. The type locality is from Howe's Lake, west of Grayling in Crawford County. It is closely related to Solidago houghtonii.

Amelanchier × lamarckii, also called juneberry, serviceberry or shadbush, is a large deciduous flowering shrub or small tree in the family Rosaceae.

Potentilla robbinsiana, the dwarf mountain cinquefoil or Robbins' cinquefoil, is a small yellow-flowered perennial growing exclusively above the tree line in the White Mountains of New Hampshire. It is nearly stemless and measures two to four centimeters in diameter.

Rhynchospora knieskernii is a rare species of sedge known by the common name Knieskern's beaksedge. It is endemic to the state of New Jersey in the United States, where it occurs naturally in the Pine Barrens. Reports have cited it present in Delaware as well, but these populations appear to have been introduced. It is threatened by the destruction and degradation of its habitat. It is a federally listed threatened species of the United States. This perennial sedge produces clumps of very narrow, triangular stems lined with thin leaves. Inflorescences occur at the tips and on the sides of the

Corallorhiza bentleyi is a rare species of orchid known to grow solely in mountainous deciduous forests of Virginia and West Virginia, United States. It was undescribed until 1999. It is a parasitic plant, with yellow to reddish stems and cleistogamous flowers.

Amsinckia douglasiana is an uncommon species of flowering plant in the family Boraginaceae, known by the common name Douglas' fiddleneck. It is endemic to the coastal Santa Monica Mountains and Santa Ynez Mountains of southern California.

Solidago shortii, commonly known as Short's goldenrod, is a species of goldenrod in the family Asteraceae. The only known populations of Short's goldenrod occur around the Blue Licks Battlefield State Park area of Kentucky and Harrison-Crawford State Forest in Indiana. It was listed on the Federal Register of Endangered Species on September 5, 1985, and was given a global rank of G1 (critically endangered) on February 29, 2000.

Phlox buckleyi, common name swordleaf phlox or shale-barren phlox, is a plant species native to Virginia and West Virginia. It grows in open woodlands, primarily on hillsides derived from shale. The first known specimen was first collected in 1838 but not described as a species until 1930. Phlox buckleyi is a perennial herb spreading by means of stolons running on the surface of the ground. Rosettes of long, narrow, evergreen leaves form at the tips of the stolons, from the center of which arises a vertical stem up to 40 cm (16 inches) tall. Inflorescence is a cyme or a paniculate group of

Eupatorium novae-angliae, commonly called New England boneset, New England justiceweed or New England thoroughwort, is a rare and endangered North American species in the family Asteraceae. It is found only in 4 counties in southern New England (Plymouth and Barnstable Counties in Massachusetts, plus Newport and Washington Counties in Rhode Island). The species is listed as endangered species in both states. Specimens of Eupatorium novae-angliae have been collected for many years, classified by botanists as the more widespread species E. leucolepis, found from Long Island to Texas. More

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.

Rubus flavinanus is a rare North American species of flowering plant in the rose family. It has been found only in the eastern United States primarily in the Appalachian Mountains of eastern West Virginia and western Maryland, but with a few populations in southern Vermont. The genetics of Rubus is extremely complex, so that it is difficult to decide on which groups should be recognized as species. There are many rare species with limited ranges such as this. Further study is suggested to clarify the taxonomy. Some studies have suggested that R. flavinanus may have originated as a hybrid

Narthecium americanum is a species of flowering plant in the Nartheciaceae known by the common names yellow asphodel and bog asphodel. It is native to New Jersey in the United States. It is now apparently limited to that state, having likely been extirpated from Delaware, North Carolina, and South Carolina. This rhizomatous perennial herb produces an erect stem 25 to 45 centimeters tall. It has narrow linear leaves up to 20 centimeters long by just a few millimeters wide around the base of the stem. Smaller leaves occur higher on the stem. The inflorescence is a dense raceme of yellow flowers

Pedicularis furbishiae, or Furbish's lousewort, is a perennial herb found only on the shores of the upper Saint John River in Maine and New Brunswick. Furbish's lousewort was first recognized as a new species by Maine naturalist and botanical artist Kate Furbish (who named it Furbish's wood betony) in 1880. It is considered an endangered species in the United States and Canada, and is threatened by habitat destruction, as well as riverside development, forestry, littering and recreational use of the riverbank. It was formerly in the family Scrophulariaceae, but is now placed in the family

Iris × robusta, called the Windermere iris, is a hybrid species of flowering plant in the family Iridaceae. Its parents are Iris versicolor and Iris virginica, both of which are native to North America. Wild populations have been found in Michigan and Ontario, and it has been introduced into Great Britain. It is a rhizomatous perennial, characterised by its violet-blue flowers and purple-flushed foliage. It has a number of cultivars, including 'Gerald Darby', 'Mountain Brook', 'Purple Fan' and 'Nutfield Blue'. Its cultivar 'Dark Aura' has gained the Royal Horticultural Society's Award of

Symphyotrichum depauperatum (formerly Aster depauperatus), commonly known as serpentine aster or starved aster, is a rare species in the family Asteraceae adapted to serpentine barrens, an ecosystem with a high concentration of toxic metals in the soil. It has been found in Pennsylvania, Maryland, and on some diabase glades in North Carolina. It grows to 50 centimeters (1+3⁄4 feet) and has white ray florets surrounding a center of yellow disk florets.

Physaria globosa is a rare flowering plant in the mustard family commonly known as globe bladderpod, Short's bladderpod, and Lesquereux's mustard. It is endemic to the United States, where it is limited to Indiana, Kentucky, and Tennessee. It is a rare species throughout its range and in 2014 the U.S. Fish and Wildlife Service issued a final rule protecting it under the Endangered Species Act.

Geum peckii is a species of herbaceous, perennial flowering plant in the rose family known by the common name mountain avens. It is native to eastern North America, where it is known from only two locations, the White Mountains of New Hampshire and three sites in Nova Scotia. This perennial herb grows 20 to 40 centimeters tall and has compound leaves made up of several rounded leaflets. Yellow flowers 1 to 3 centimeters wide are produced in June through September. The plant reproduces vegetatively via rhizome and sexually via seed. Each flower produces about 50 seeds. In New Hampshire the

Eupatorium resinosum, the pine barren thoroughwort or resinous boneset, is a rare North American plant species in the family Asteraceae. Eupatorium resinosum is native to the eastern coastal states of the United States, though with a discontinuous distribution. Some populations grow in the Carolinas, others in New Jersey. It formerly grew in New York and Delaware, but is now apparently extirpated there. There are no reports of the species in Maryland or Virginia in between. Eupatorium resinosum has stems up to 100 cm (40 inches) tall and produce short rhizomes. The inflorescences are composed

Phacelia brachyloba is a species of phacelia known by the common name shortlobe phacelia. It is native to southern California and Baja California, where it grows in the coastal mountains, canyons, and valleys. It is one of the many species known as fire followers, that emerge in areas recently burned. It is an annual herb growing erect to a maximum height near 60 centimeters. It is hairy and glandular. The lance-shaped leaves are lobed or divided into lobed leaflets. The hairy, glandular inflorescence is a one-sided curving or coiling cyme of many funnel- or bell-shaped flowers. Each flower

Iliamna remota, commonly known as the Kankakee mallow, is an endangered species of flowering plant in the mallow family. It is endemic to a single location, the 700-metre-long (2,300 ft) Langham Island in Kankakee River State Park, in the US state of Illinois.

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.

Isoetes macrospora is a species of flowering plant in the family Isoetaceae. It is sometimes referred to by the common name big-spore quillwort, It can be found in the deep water of low nutrient lakes in the Precambrian Shield as well as in Newfoundland, Nova Scotia, Quebec, and Ontario. In the United States, it has been found in Minnesota and south, through the Appalachian Mountains to Virginia. It bears 3 to 17 long, stiff dark green leaves, sometimes with recurving tips. The sporangium can be 5 millimeters long and 4 millimeters wide, covered from one sixth to one quarter by the velum. The

Hypericum swinkianum, known as Swink's St. John's wort, is a shrub in the St. John's wort family. It was named after Chicago Region botanist Floyd Swink (1921-2000).