Plants named in 1821

The loquat (Eriobotrya japonica, Chinese: 枇杷; Pinyin: pípá) is a large evergreen shrub or tree grown commercially for its orange fruit. It is also cultivated as an ornamental plant. The loquat is in the family Rosaceae, subfamily Spiraeoideae, tribe Pyreae, subtribe Pyrinae. It is native to the cooler hill regions of south-central China. In Japan, the loquat has been grown for over 1,000 years. It has been introduced to regions with subtropical to mild temperate climates throughout the world. Eriobotrya japonica formerly was thought to be closely related to the genus Mespilus and is still

The Brussels sprout is a member of the Gemmifera cultivar group of cabbages (Brassica oleracea), grown for its edible buds.

Guaraná ( from the Portuguese guaraná [ɡʷaɾɐˈna]; Paullinia cupana, syns. P. crysan, P. sorbilis) is a climbing plant in the family Sapindaceae, native to the Amazon basin and especially common in Brazil. Guaraná has large leaves and clusters of flowers, and is best known for the seeds from its beans, which are about the size of a coffee bean. As a dietary supplement or herb, guaraná seed is an effective stimulant: it contains about twice the concentration of caffeine found in coffee beans (about 2–8% caffeine in guaraná seeds, compared to about 1–3% for coffee beans). The additive has gained

Persicaria maculosa (syn. Polygonum persicaria) is an annual plant in the buckwheat family, Polygonaceae. Common names include lady's thumb, spotted lady's thumb, Jesusplant, and redshank. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. It is also present as an introduced and invasive species in North America, where it was first noted in the Great Lakes region in 1843 and has now spread through most of the continent.

Rafflesia arnoldii is a species of flowering plant in the parasitic genus Rafflesia within the family Rafflesiaceae. It is native to the rainforests of Sumatra and Borneo. It is commonly known as the corpse flower or giant padma. It is noted for producing the largest individual flower on Earth. Although there are some plants with larger flowering organs like the titan arum (Amorphophallus titanum) and talipot palm (Corypha umbraculifera), those are technically clusters of many flowers. It is noted to have a strong and unpleasant odour akin to that of decaying flesh. Rafflesia arnoldii is one

Valeriana locusta, commonly called mâche, cornsalad, or lamb's lettuce, a small, herbaceous, annual flowering plant in the honeysuckle family Caprifoliaceae. It is native to Europe, western Asia and north Africa, where it is eaten as a leaf vegetable.

The Tamaricaceae, the tamarisk family, are a family of plants native to drier areas of Europe, Asia, and Africa. It contains four genera: Tamarix (with 73 species), Reaumuria (25 species), Myricaria (13 species), and Myrtama (a single species). In the 1980s, the family was classified in the Violales under the Cronquist system; more modern classifications (Angiosperm Phylogeny Group) place them in the Caryophyllales. Many of the plants in the family grow on saline soils, tolerating up to 15,000 ppm soluble salt and can also tolerate alkaline conditions. The leaves are generally scale-like,

Hippeastrum is a genus of 116 species, and over 600 hybrids and cultivars, of perennial, herbaceous and bulbous plants, native to tropical and subtropical regions of the Americas, from Mexico south to Argentina and on some islands in the Caribbean. The majority have large, fleshy bulbs and tall, broad, strap-like leaves that are (generally) evergreen, and large red or purple flowers. Numerous colors and cultivars have been created over the past hundred years. Hippeastrum is a genus in the family Amaryllidaceae (subfamily Amaryllidoideae, tribe Hippeastreae, and subtribe Hippeastrinae). For

Aronia melanocarpa, called the black chokeberry, is a species of shrubs in the rose family native to eastern North America, ranging from Canada to the central United States, from Newfoundland west to Ontario and Minnesota, south as far as Arkansas, Alabama, and Georgia. This plant has been introduced and is cultivated in Europe. It is a branching shrub with glossy dark green leaves that take on a red color in the autumn; it grows well in the sun and part-shade, often to heights of six feet (1.8 m) or more, forming clumps by means of stems rising from the roots. Its flowers are white or pink,

Vanda, abbreviated in the horticultural trade as V., is a genus in the orchid family, Orchidaceae. There are 90 species, and the genus is commonly cultivated for the marketplace. This genus and its allies are considered to be among the most specifically adapted of all orchids within the Orchidaceae. The genus is highly prized in horticulture for its showy, fragrant, long-lasting, and intensely colorful flowers. Vanda species are widespread across East Asia, Southeast Asia, and New Guinea, with a few species extending into Queensland and some of the islands of the western Pacific.

Acacia dealbata, commonly known as silver wattle, blue wattle or mimosa, is a species of flowering plant in the legume family, Fabaceae and is endemic to south-eastern mainland Australia. It is a bushy shrub or spreading tree with smooth bark, bluish grey or silvery and glaucous bipinnate leaves, spherical heads of yellow to bright yellow flowers, and straight to slightly curved pods. The Wiradjuri people of New South Wales use the name giigandul for the species.

Lardizabalaceae is a family of flowering plants. The family has been universally recognized by taxonomists, including the APG II system (2003; unchanged from the APG system of 1998), which places it in the order Ranunculales, in the clade eudicots. The family consist of 7 genera with about 40 known species of woody plants. All are lianas, save Decaisnea, which are pachycaul shrubs. The leaves are alternate, and compound (usually palmate), with pulvinate leaflets. The flowers are often in drooping racemes. They are found in eastern Asia, from the Himalayas to Japan, with the exception of the

The Styracaceae are a small family of flowering plants in the order Ericales, containing 12 genera and about 160 species of trees and shrubs. The family occurs in warm temperate and subtropical regions of the Northern Hemisphere. The family is characterised by spirally arranged simple leaves with no stipules; symmetrical white flowers with a corolla of two to five (sometimes seven) fused petals; and the fruit usually is a dry capsule, sometimes winged, less often a fleshy drupe, with one or two seeds. Most are large shrubs to small trees 3–15 m tall, but Halesia monticola (H. carolina var.

Chaenomeles is a genus of four species of deciduous spiny shrubs, usually 1–3 m tall, in the family Rosaceae. They are native to Eastern Asia. These plants are related to the quince (Cydonia oblonga) and the Chinese quince (Pseudocydonia sinensis), differing in the serrated leaves that lack fuzz, and in the flowers, borne in clusters, having deciduous sepals and styles that are connate at the base. The leaves are alternately arranged, simple, and have a serrated margin. The flowers are 3–4.5 cm diameter, with five petals, and are usually bright orange-red, but can be white or pink; flowering

Salvia splendens, the scarlet sage, is a tender herbaceous perennial plant native to Brazil, growing at 2,000 to 3,000 m (6,600 to 9,800 ft) elevation where it is warm year-round and with high humidity. The wild form, rarely seen in cultivation, reaches 1.3 m (4.3 ft) tall. Smaller cultivars are very popular as bedding plants, seen in shopping malls and public gardens all over the world.

Berberis thunbergii, the Japanese barberry, Thunberg's barberry, or red barberry, is a species of flowering plant in the barberry family Berberidaceae, native to Japan and eastern Asia, though widely naturalized in China and North America, where it has become a problematic invasive in many places, leading to declines in species diversity, increased tick habitat, and soil changes. Growing to 1 m (3 ft 3 in) tall by 2.5 m (8 ft 2 in) broad, it is a small deciduous shrub with green leaves turning red in the autumn, brilliant red fruits in autumn and pale yellow flowers in spring.

Calanthe, commonly known as Christmas orchids, is a genus of about 220 species of orchids in the family Orchidaceae. They are evergreen or deciduous terrestrial plants with thick roots, small oval pseudobulbs, large corrugated leaves and upright, sometimes arching flowering stems. The sepals and petals are narrow and a similar size to each other and the labellum usually has spreading lobes.

Zephyranthes is a genus of temperate and tropical bulbous plants in the Amaryllis family, subfamily Amaryllidoideae, native to the Americas and widely cultivated as ornamentals. Following the expansion of the genus in 2019, which now includes the genera Habranthus and Sprekelia, there are about 200 recognized species, as well as numerous hybrids and cultivars. Common names for species in this genus include fairy lily, rainflower, zephyr lily, magic lily, Atamasco lily, and rain lily. The name is derived from Ζέφυρος (Zephyrus), the Greek god of the west wind, and ἄνθος (anthos), meaning

Nuphar pumila, the least water-lily, is a perennial, rhizomatous, aquatic herb in the family Nymphaeaceae native to subarctic and temperate Eurasia.

Eriobotrya is a genus of flowering plants, mostly large evergreen shrubs and small trees, in the family Rosaceae, native to woodland in the Himalayas and East Asia. The loquat, E. japonica, is grown for its edible fruit. Eriobotrya species are used as food plants by the larvae of some Lepidoptera species including Hypercompe hambletoni.

Diplotaxis tenuifolia is a species of flowering plant in the mustard family known by the common name perennial wall-rocket. It is native to Europe and western Asia, where it grows on disturbed ground and roadsides, and it can now be found throughout much of the temperate world where it has naturalized. In recent years it has increasingly been cultivated to produce salad leaves, which are marketed as wild rocket in Britain or arugula in the US. It is easily confused with garden rocket, which has similar uses.

Philydraceae is a family of flowering plants composed of three genera and a total of six known species. Such a family has not been recognized by many taxonomists. The APG II system, of 2003 (unchanged from the APG system, of 1998), does recognize such a family and places it in the order Commelinales, in the clade commelinids, in the monocots. It consists of only very few species of perennial, tropical plants in Southeast Asia and Australia.

Pilea, with 600–715 species, is the largest genus of flowering plants in the nettle family Urticaceae. It is distributed throughout the tropics, subtropics, and warm temperate regions (with the exception of Australia and New Zealand).

Photinia is a genus of about 30 species of small trees and large shrubs, but the taxonomy has recently varied greatly, with the genera Heteromeles, Stranvaesia and Aronia sometimes included in Photinia. They are a part of the rose family (Rosaceae) and related to the apple. The botanical genus name derives from the Greek word photeinos for shiny and refers to the often glossy leaves. Most species are evergreen, but deciduous species also occur. The small apple-shaped fruit has a size of 4 to 12 mm and forms in large quantities. They ripen in the fall and often remain hanging on the bush until

Diplotaxis (wall-rocket) is a genus of 39 species of flowering plants in the family Brassicaceae (Cruciferae), native to Europe, the Mediterranean region, Macaronesia, Western Asia, the Himalayas, and northeastern tropical Africa; the species diversity is highest in the Iberian Peninsula, North Africa and the Cape Verde archipelago. They are annual or perennial plants, either herbaceous or sub-shrubby with a woody base. The flowers are yellow in most species, but are white in Diplotaxis erucoides and violet in Diplotaxis acris. Some species, such as Diplotaxis tenuifolia and Diplotaxis

Berteroa, the false madworts, is a genus of flowering plants of the family Brassicaceae, native to temperate Eurasia. Its best known member is the weedy invasive hoary alyssum, Berteroa incana.

Rorippa sylvestris (the creeping yellowcress, keek, or yellow fieldcress; syn. Radicula sylvestris (L.) Druce ) is an invasive species of plant in the United States, likely entering from Europe before 1818 from ballast water and spreading throughout North America through contaminated nursery seed stock.

Rorippa palustris, marsh yellow-cress, bog yellow-cress or common yellow-cress, is a species of flowering plant in the family Brassicaceae. It is widespread and native to parts of Africa, and much of Asia, Europe and Eurasia, North America and the Caribbean. It can also be found in other parts of the world as an introduced species and a common weed, for example, in Australia and South America. It is an adaptable plant which grows in many types of damp, wet, and aquatic habitat. It may be an annual, biennial, or perennial plant, and is variable in appearance as well.

Hydnoroideae is a subfamily of parasitic flowering plants in the order Piperales. Traditionally, and as recently as the APG III system it given family rank under the name Hydnoraceae. It is now submerged in the Aristolochiaceae. It contains two genera, Hydnora and Prosopanche: Prosopanche is native to Central and South America; Hydnora can be found in semi-arid to desert regions of Africa, the Arabian Peninsula, and Madagascar. Members of this subfamily have been described as the strangest plants in the world.

Pimenta is a genus of flowering plants in the myrtle family, Myrtaceae described as a genus in 1821. It is native to Central and South America, Mexico, and the West Indies. Well-known species include allspice (P. dioica) and the West Indian bay tree (P. racemosa). The name is mostly probably derived from the Portuguese word "pimenta", with the same meaning of the Spanish word pimienta, meaning "peppercorn." It refers to the berries of P. dioica.