Plants named in 1791

Dahlia (UK: DAY-lee-ə, US: DA(H)L-yə, DAYL-yə) is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico and Central America. Dahlias are members of the Asteraceae (synonym name: Compositae) family of dicotyledonous plants, its relatives include the sunflower, daisy, chrysanthemum, and zinnia. There are 49 species of dahlia, with flowers in almost every hue (except blue), with hybrids commonly grown as garden plants. Dahlias were known only to the Aztecs and other southern North American peoples until the Spanish conquest, after which the plants were brought to Europe. The

Ceiba pentandra is a tropical tree of the order Malvales and the family Malvaceae (previously placed in the family Bombacaceae), native to Central America, the Caribbean, and the northern half of South America; some authors also consider it native in western and central Africa. It is widely introduced in other tropical regions including South and Southeast Asia, where it is cultivated. The tree and the cotton-like fluff obtained from its seed pods are commonly known in English as kapok, a Malay-derived name which originally applied to the related species Bombax ceiba, a native of tropical

Betula pubescens (syn. Betula alba), commonly known as downy birch and also as moor birch, white birch, European white birch or hairy birch, is a species of deciduous tree, native and abundant throughout northern Europe and northern Asia, growing further north than any other broadleaf tree. It is closely related to, and often confused with, the silver birch (B. pendula), but grows in wetter places with heavier soils and poorer drainage; smaller trees can also be confused with the dwarf birch (B. nana). Six varieties are recognised and it hybridises with the silver and dwarf birches. A number

Silybum marianum is a species of thistle. It has various common names including milk thistle, blessed milkthistle, Marian thistle, Mary thistle, Saint Mary's thistle, Mediterranean milk thistle, variegated thistle and Scotch thistle (not to be confused with Onopordum acanthium or Cirsium vulgare). This species is an annual or biennial plant of the family Asteraceae. This fairly typical thistle has red to purple flowers and shiny pale green leaves with white veins. Once native from Southern Europe through Asia, it has spread throughout the world.

Cosmos is a genus, with the same common name of cosmos, consisting of flowering plants in the daisy family.

Myosotis sylvatica, the wood forget-me-not or woodland forget-me-not, is a species of flowering plant in the family Boraginaceae, native to Europe. This spring-flowering plant and its cultivars, typically with blue flowers, are the familiar forget-me-nots of gardens.

Caesalpinia pulcherrima is a species of flowering plant in the pea family Fabaceae, native to the tropics and subtropics of the Americas. It could be native to the West Indies, but its exact origin is unknown due to widespread cultivation. Common names for this species include poinciana, peacock flower, red bird of paradise, Mexican bird of paradise, dwarf poinciana, pride of Barbados, flos pavonis, and flamboyant-de-jardin. The Hawaiian name for this plant is ʻohai aliʻi.

Jacobaea vulgaris, synonym Senecio jacobaea, is a very common wild flower in the family Asteraceae that is native to northern Eurasia, usually in dry, open places, and has also been widely distributed as a weed elsewhere. Common names include ragwort, common ragwort, stinking willie, tansy ragwort, benweed, St. James-wort, stinking nanny/ninny/willy, staggerwort, dog standard, cankerwort, stammerwort. In the western United States it is generally known as tansy ragwort, or tansy, though its resemblance to the true tansy is superficial. In some countries it is an invasive species and regarded

Antennaria is a genus of dioecious perennial herbs in the family Asteraceae, native to temperate regions of the Northern Hemisphere, with a few species (A. chilensis, A. linearifolia, A. sleumeri) in temperate southern South America; the highest species diversity is in North America. Common names include catsfoot or cat's-foot, pussytoes and everlasting. Different Antennaria species reach between 10 cm and 50 cm in height. The leaves are basal and often stem leaves. The name Antennaria refers to the projecting stamens seen on the male flowers of some species, resembling insect antennae.

Pulicaria is a genus of flowering plant in the sunflower family, native to Europe, Asia, and Africa. In North America Pulicaria is known by the common name false fleabane. Pulicaria species accepted by the Plants of the World Online as of June 2022:

Vernonia is a genus of about 350 species of forbs and shrubs in the family Asteraceae. Some species of this genus are known as ironweeds. Some species are edible and of economic value. They are known for having intense purple flowers. There have been numerous distinct subgenera and subsections named in this genus, and some botanists have divided the genus into several distinct genera. For instance, the Flora of North America recognizes only about twenty species in Vernonia sensu stricto, seventeen of which are in North America north of Mexico, with the others being found in South America.

Gazania is a genus of flowering plants in the family Asteraceae, native to Southern Africa. They produce large, daisy-like composite flowerheads in brilliant shades of yellow and orange, over a long period in summer. They are often planted as drought-tolerant groundcover, but regarded as an environmental weed in parts of Australia, the Mediterranean, New Zealand, and California, where they have become naturalised.

Cosmos bipinnatus, commonly called the garden cosmos, Mexican aster or cosmea, is a medium-sized flowering herbaceous plant in the daisy family Asteraceae, native to the Americas. The species and its varieties and cultivars are popular as ornamental plants in temperate climate gardens.

Antennaria dioica (mountain everlasting, stoloniferous pussytoes, catsfoot or cudweed) is a Eurasian species of flowering plant in the family Asteraceae. It is a perennial herb found in cool northern and mountainous regions of Europe and northern Asia (Russia, Mongolia, Japan, Kazakhstan, China (Xinjiang, Heilongjiang, Gansu) and the Aleutian Islands of Alaska.

Juniperus drupacea, the Syrian juniper, is a species of juniper native to the eastern Mediterranean region from southern Greece (mount Parnon in the Peloponnese), southern Turkey, western Syria, Lebanon, and northern Israel, growing on rocky sites from 800–1,700 metres (2,600–5,600 feet) in altitude. The species is the sole member of Juniperus sect. Caryocedrus., which is sometimes recognised as genus Arceuthos.

Nicandra physalodes is a species of flowering plant in subfamily Solanoideae of the nightshade family. It is known by the common names apple-of-Peru and shoo-fly plant. It is thought originally to have been native to western South America, including Peru, and is known elsewhere as an introduced and ruderal species – sometimes as a weed – in tropical, subtropical and, to a lesser extent, temperate areas all over the world. It has also long been cultivated as an ornamental plant for its attractive flowers and curious fruits (the latter sometimes dried for use in floral design) and has been

Hagenia is a monotypic genus of flowering plant with the sole species Hagenia abyssinica, native to the high-elevation Afromontane regions of central and eastern Africa. It also has a disjunct distribution in the high mountains of East Africa from Sudan and Ethiopia in the north, through Kenya, Uganda, Rwanda, Burundi, Democratic Republic of Congo, and Tanzania, to Malawi and Zambia in the south. A member of the rose family, its closest relative is the Afromontane genus Leucosidea.

Veronica filiformis is a species of flowering plant in the family Plantaginaceae. It is known by many common names, including slender speedwell, creeping speedwell, threadstalk speedwell and Whetzel weed. It is native to eastern Europe and western Asia, and it is known in many other regions as an introduced species.

Liatris, commonly known as gayfeather and blazing star is a genus of flowering plants in the tribe Eupatorieae within the family Asteraceae native to North America (Canada, United States, Mexico and the Bahamas). Some species are used as ornamental plants, sometimes in flower bouquets. They are perennials, surviving the winter and resprouting from underground corms. Liatris species are used as food plants by the larvae of some Lepidoptera species such as moths of the genus Schinia.

Cyperus eragrostis is a species of sedge known by several common names, including tall flatsedge, nutgrass, tall nutgrass, umbrella sedge, chufa, Earth almond, zula nuts, edible galingale and pale galingale. In New Zealand, it is also known by the Māori name Puketangata. This species is associated with disturbed wet environments.

Cosmos sulphureus is a species of flowering plant in the sunflower family Asteraceae, also known as sulfur cosmos and yellow cosmos. It is native to Mexico, Central America, and northern South America, and naturalized in other parts of North and South America as well as in Europe, Asia, and Australia. This plant was declared invasive by the United States Southeast Exotic Pest Plant Council in 1996. The flowers of all Cosmos attract birds and butterflies, including the monarch butterfly.

Gazania rigens (syn. G. splendens), sometimes called treasure flower, is a species of flowering plant in the family Asteraceae, native to coastal areas of southern Africa. It is naturalised elsewhere and is widely cultivated as an ornamental plant.

Viola rupestris is a species of flowering plant belonging to the family Violaceae. It is native to Temperate Eurasia.

Pulicaria vulgaris is a species of flowering plant belonging to the family Asteraceae. Its native range is Europe to Western Siberia, the Himalaya, and Northern Africa. The plant is an annual and grows in temperate cilmates.

Petasites albus, the white butterbur, is a flowering plant species in the family Asteraceae. It is native to central Europe and the Caucasus.

Cerbera odollam is a tree species in the family Apocynaceae commonly known as the suicide tree or pong-pong. It bears a fruit known as othalanga whose seeds yield a potent poison called cerberin. It has historically been used in trials by ordeal, especially in Madagascar, where it has caused thousands of deaths annually, and continues to be used for suicide, particularly in Kerala, India. It can cause fatal heart arrhythmias with just one kernel and is responsible for numerous poisonings due to its easily masked taste and limited testing. It is native to South and Southeast Asia, Pacific

Stellaria palustris, commonly known as marsh stitchwort, is a species of flowering plant belonging to the family Caryophyllaceae. It was first described in 1791. Its native range is Temperate Eurasia.

Ipomoea mauritiana is a type of morning glory plant. Like the sweet potato, it belongs to the genus Ipomoea. It grows as a vine. Its origins are uncertain, but it has been recorded in West Africa, including in Gambia and the riparian forests of Benin, as well as Australia's Northern Territory. It is naturalised in many parts of the world, including Taiwan. Specimens have been collected or observations taken in Australia, Belize, Benin, Brunei, Cambodia, Cameroon, China, Colombia, DRC, Costa Rica, Côte d'Ivoire, Ecuador, Equatorial Guinea, Gabon, Ghana, Guinea, Honduras, Indonesia, Laos,

Barringtonia acutangula is a species of Barringtonia native to coastal wetlands in southern Asia and northern Australasia, from Afghanistan east to the Philippines, Queensland and the Northern Territory. Common names include freshwater mangrove, itchytree and mango-pine.

Juncus acutiflorus, also called sharp-flowered rush, is a rush or a grassy flowering plant in the family Juncaceae. As the name suggests, the plant has notable sharp-looking flowers, flowering between July and September.