Flora of Massachusetts

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

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

Isoetes macrospora, commonly known as big-spore quillwort, is a species of flowering plant in the family Isoetaceae. It can be found in the deep water of low nutrient lakes on the Canadian Shield 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.

Phacelia egena is a species of phacelia known by the common name Kaweah River phacelia. It is native to much of California, from the Transverse Ranges to the northern mountains and into Oregon; it also occurs in Arizona. It grows in many types of habitat.

Crocanthemum dumosum, common known as bushy frostweed and bushy rockrose, is a perennial plant that is native to the United States.

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.

Sagittaria teres, the quill-leaved arrowhead or slender arrowhead, is an aquatic plant species in the genus Sagittaria. It is a perennial herb up to 80 centimetres (31 inches) tall. The leaves can grow both under and above the water. The flowers are white, up to 1.5 cm (1⁄2 in) in diameter, borne in one or more whorls on a stalk rising above the leaves. It is native to the northeastern United States: Rhode Island (Providence and Washington Counties), Massachusetts, New Hampshire (Hillsborough County), New York (Suffolk County) and New Jersey. It grows along the shores of lakes, marshes, and

Pityopsis falcata, commonly known as sickleleaf silkgrass, sickle-leaved golden aster, and New England Golden aster, is perennial plant in the family Asteraceae native to the northeastern Atlantic Coastal Plain of the United States.

× Sorbaronia is a hybrid genus of flowering plants belonging to the family Rosaceae. The hybrids are between species of Sorbus and Aronia. It is native to Eastern Canada. In addition, × Sorbaronia fallax has been created artificially.

Potamogeton ogdenii, common name Ogden's pondweed, is a perennial plant native to North America.

Sabatia kennedyana is a species of flowering plant in the gentian family known by the common name Plymouth rose gentian. It is native to eastern North America. It has a disjunct distribution, occurring in Nova Scotia, Massachusetts, Rhode Island, Virginia, North Carolina, and South Carolina.

Phacelia distans is a species of flowering plant in the family Hydrophyllaceae, known by the common names distant phacelia and distant scorpionweed. It is native to the southwestern United States and northwestern Mexico, where it grows in many types of habitat, including forest, woodland, chaparral, grassland, and meadows.

Scirpus longii is a species of flowering plant in the sedge family known by the common name Long's bulrush. It is native to eastern North America, where it is limited to the Atlantic coastal plain. This perennial plant grows from a large rhizome and forms clumps of stems up to 1.5 meters tall. It flowers rarely, any time between May and August. The inflorescence is an open cyme of spikelets up to about a centimeter long. This species grows in wetlands such as river banks and bogs.

Corema conradii is a species of flowering plant in the heath family known by the common name broom crowberry. It is native to eastern North America, where it has a disjunct distribution, occurring intermittently from Nova Scotia to Massachusetts, in the Shawangunk Mountains of New York, and in the Pine Barrens of New Jersey. Studies indicate that the plant might be a hybrid between ancestral populations of Corema album and Ceratiola.

Rubus permixtus is a North American species of dewberry in the genus Rubus, a member of the rose family. It grows in scattered locations in the north-central and northeastern United States, from Maine south as far as West Virginia plus Michigan and Wisconsin. Nowhere is it very common. Rubus permixtus is a nearly prostrate shrub that runs along the ground as much as 6 feet (180 cm), with vertical stems arising from those on the ground. Fruits are generally black, sweet, and edible.

Desmodium × humifusum is a species of flowering plant in the legume family known by the common names trailing tick-trefoil, eastern trailing tick-trefoil, and spreading tick-trefoil. It is native to the eastern United States, where it has been reduced to scattered populations in the states of Massachusetts, Connecticut, and Indiana. It once had a wider distribution but it has likely been extirpated from Delaware, Maryland, New Jersey, New York, Rhode Island, Virginia, West Virginia, and Missouri. This plant is prostrate, its hairy stems trailing up to 2 metres (7 ft) long. One plant may have

Coreopsis rosea, known as the pink tickseed, is a North American species of Coreopsis in the family Asteraceae. It has a discontinuous distribution in the eastern United States and Canada, found in Nova Scotia, Massachusetts, Rhode Island, New York, New Jersey, Pennsylvania, Delaware, Maryland, Georgia, and South Carolina. Coreopsis rosea grows in wet areas such as marsh edges. Unlike most Coreopsis species, the ray florets are pink or white (instead of yellow). The only other Coreopsis species with pink rays is C. nudata; C. rosea does not seem to be closely related to Coreopsis species

Scutellaria integrifolia, commonly called helmet flower or helmet skullcap, is a flowering plant in the mint family. It is native to the eastern United States where it is found in openings in mesic, acidic soil. It likely requires disturbance in the form of fire to maintain its appropriate habitat. Scutellaria integrifolia is identifiable by its narrow, usually entire leaves and densely pubescent stem. It produces a raceme of large blue-purple flowers in late spring through summer.

Scirpus ancistrochaetus is a rare species of flowering plant in the sedge family known by the common names barbedbristle bulrush and northeastern bulrush. It is native to the northeastern United States from New Hampshire south to Virginia. It used to be found in Quebec but it is now thought to be extirpated there. It was also believed extirpated from the state of New York, but at least one population has been rediscovered in Steuben County in 2010. It is threatened by the loss and degradation of its wetland habitat. It is a federally listed endangered species. This bulrush produces clumps of

Crataegus brainerdii is a species of flowering plant in the rose family known by the common name Brainerd's hawthorn. It is named for Ezra Brainerd (1844–1924), a renowned botanist and former president of Middlebury College, in Vermont. It is native to eastern North America, including eastern Canada and the eastern United States. This species is a shrub or small tree growing up to 30 feet tall. The branches are lined with thorns up to 1.6 inches long. The serrated leaves are somewhat triangular in shape and sometimes slightly lobed. They are hairy when new. The flowers are borne in clusters.

Amphicarpum amphicarpon, commonly known as peanut grass or Pursh's blue maidencane, is an annual wetland species found in the eastern United States. Its common name honours botanist Frederick Traugott Pursh. It was previously considered to be part of the genus Milium.

Isoetes × eatonii, or Eaton's quillwort, is a hybrid between I. engelmannii and I. tenella. It can be found in ponds and slow moving rivers in Canada or in several New England states. In Canada, it has only been found in the Severn River in Ontario. In the United States, it has been found in Pennsylvania, New Jersey, and New York. It bears 12-100 long yellowish green leaves, each fine, soft, and 8 to 45 centimeters long. The unspotted tan colored sporangium are 12 millimeters long and 5 millimeters wide. The velum covers a sixth to a quarter of the sporangium. The elongated ligule is 3.5

Bidens hyperborea is a species of flowering plant in the family Asteraceae commonly known as estuary beggarticks, northern beggarticks, or estuary bur-marigold. Known from marshes and estuarine regions in northeastern North America, it is a variable annual herb with yellow flowers similar to Bidens cernua, Bidens laevis, and Bidens eatonii. B. hyperborea is listed as an endangered species in the state of Massachusetts, where it is threatened by habitat degradation, and is listed by NatureServe as critically imperiled (S1) in the province of Ontario and possibly extirpated from New Hampshire.

Vaccinium caesariense (New Jersey blueberry) is a Vaccinium species native to the Eastern United States.

Bidens eatonii (Eaton's beggarticks) is a North American species of flowering plant in the family Asteraceae. It is native to eastern Canada (Québec, New Brunswick, Prince Edward Island) and the northeastern United States (Maine, Massachusetts, Connecticut, New York, New Jersey). Bidens eatonii is an annual herb up to 150 cm (60 inches) tall. It produces as many as 3 flower heads containing yellow disc florets but usually no ray florets (occasionally 1, 2, or 3). The species grows mostly along the banks of estuaries and coastal salt marshes.

Polystichum × potteri, known as Potter's holly fern, is a hybrid between Polystichum braunii and Polystichum acrostichoides. It is named for Henry Potter, a Vermont farmer and botanist.

Chenopodium foggii, commonly known as Fogg's goosefoot, is a species of annual herb found throughout eastern North America and particularly New England.

Prunus maritima, the beach plum, is a species of plum native to the East Coast of the United States. It is a choice wild edible and its few pests and salt tolerance make it a resilient fruit crop for degraded lands and urban soils.

Corema is a genus of two species of flowering plants in the family Ericaceae. They are dioecious small shrubs.

Amphicarpum (common name maidencane) is a genus of North American plants in the grass family, found only in the eastern United States.