Plants named in 1820

The Arecaceae are a family of perennial, flowering plants in the monocot order Arecales. Their growth form can be climbers, shrubs, tree-like and stemless plants, all commonly known as palms. Those having a tree-like form are colloquially called palm trees. Currently, 181 genera with around 2,600 species are known, most of which are restricted to tropical and subtropical climates. Most palms are distinguished by their large, compound, evergreen leaves, known as fronds, arranged at the top of an unbranched stem, except for the Hyphaene genus, which has branched palms. However, palms exhibit an

Asteraceae ( ) is a large family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the order Asterales. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger family is unclear as the number of extant species in each family is unknown. The Asteraceae were first described in the year 1740 and given the original name Compositae. The family is commonly known as the aster, daisy, composite, or sunflower family. Most species of Asteraceae are herbaceous plants, and may be annual, biennial, or perennial, but there are

Lamiaceae or Labiatae is a family of flowering plants commonly known as mints, deadnettles, or sages. Many species in Lamiaceae are aromatic, and the family includes many widely used culinary herbs like basil, mint, rosemary, sage, savory, marjoram, oregano, hyssop, thyme, lavender, and perilla, as well as traditional medicines such as catnip, skullcap, bee balm, wild dagga, and oriental motherwort. Some species are shrubs, trees (such as teak), or, rarely, vines, but most are herbaceous. Many members of the family are widely cultivated, not only for their aromatic qualities, but also their

Rosales (, roh-ZAY-leez) are an order of flowering plants. Well-known members of Rosales include: roses, strawberries, blackberries and raspberries, apples, cherries, pears, plums, peaches and apricots, almonds, rowan and hawthorn, jujube, elms, banyans, figs, mulberries, breadfruit, nettles, hops, and cannabis. Rosales contain about 7,700 species, distributed into nine families and about 260 genera. Their type family is the rose family, Rosaceae. The largest families are Rosaceae (91/4828) and Urticaceae (53/2625).

Sapindales is an order of flowering plants that diversified in the mid-Cretaceous. Well-known members of Sapindales include citrus; maples, sumac, horse-chestnuts, lychees and rambutans; mangos and cashews; frankincense and myrrh; mahogany and neem. The APG III system of 2009 includes it in the clade malvids (in rosids, in eudicots) with the following nine families: Anacardiaceae Biebersteiniaceae Burseraceae Kirkiaceae Meliaceae Nitrariaceae (including Peganaceae and Tetradiclidaceae) Rutaceae Sapindaceae Simaroubaceae The APG II system of 2003 allowed the optional segregation of families

The Malpighiales comprise one of the largest orders of flowering plants. The order is very diverse, with well-known members including willows, violets, poplars, corpse flower, coca plant, cassava, rubber tree, castor bean, spurges, flaxseed, Saint John's wort, passionfruit, mangosteen, and manchineel tree. The order is not part of any of the classification systems based only on plant morphology and the relationships of its diverse members can be hard to recognize except with molecular phylogenetic evidence. Molecular clock calculations estimate the origin of stem group Malpighiales at around

Zingiberaceae, the ginger family, is a family of flowering plants containing 58 genera and about 1600 described species distributed globally in the tropics and subtropics. They are aromatic perennial herbs with creeping rhizomes, sometimes tuberous. Basal leaf sheathing forms a pseudostem taller than their true stems which emerge unbranched. Flowers are typically zygomorphic (bilaterally symmetrical) and inflorescence is raceme. Fruit is typically a dry capsule and seeds are arillate. Ancient fossils and phylogenetics indicate the Zingiberaceae evolved in Africa during the mid-Cretaceous

The Ericales are a large and diverse order of flowering plants in the asterid group of the eudicots. Well-known and economically important members of this order include tea and ornamental camellias, persimmon, ebony, blueberry, cranberry, lingonberry, huckleberry, kiwifruit, Brazil nut, argan, sapote, azaleas and rhododendrons, heather, heath, impatiens, phlox, Jacob's ladder, primroses, cyclamens, shea, sapodilla, pouterias, and trumpet pitchers. The order includes 22 families, according to the APG IV system of classification. The Ericales include trees, bushes, lianas, and herbaceous

Cannabaceae is a small family of flowering plants, known as the hemp family. As now circumscribed, the family includes about 170 species grouped in about 11 genera, including Cannabis (hemp), Humulus (hops) and Celtis (hackberries). Celtis is by far the largest genus, containing about 100 species. Cannabaceae is a member of the Rosales. Members of the family are erect or climbing plants with petalless flowers and dry, one-seeded fruits. Hemp (Cannabis) and hop (Humulus) are the most economically important species. Other than a shared evolutionary origin, members of the family have few common

The Magnoliales are an order of flowering plants. Well-known members of Magnoliales include: magnolias, tulip trees, custard apples, American pawpaw, cherimoyas, ylang-ylang, soursop fruit, and nutmeg.

The Alismatales (alismatids) are an order of flowering plants including about 4,500 species. Plants assigned to this order are mostly tropical or aquatic. Some grow in fresh water, some in marine habitats. Perhaps the most important food crop in the order is the taro plant, Colocasia esculenta.

Rafflesia, or stinking corpse lily, is a genus of parasitic flowering plants in the family Rafflesiaceae. The species have enormous flowers, the buds rising from the ground or directly from the lower stems of their host plants; one species has the largest flower in the world. Plants of the World Online lists up to 41 species from this genus; all of them are found in Southeast Asia. Western Europeans first learned about plants of this genus from French surgeon and naturalist Louis Deschamps when he was in Java between 1791 and 1794; but his notes and illustrations were seized by the British in

Piperales is an order of flowering plants (4,170 recognized species). It necessarily includes the family Piperaceae but other taxa have been included or disincluded variously over time. Well-known plants which may be included in this order include black pepper, kava, the many Peperomias, pepper elder, lizard's tail, birthwort, and wild ginger. The two perianthless families Piperaceae and Saururaceae are mainly herbaceous plants possessing highly reduced flowers.

Saxifragales is an order of flowering plants in the superrosid clade of the eudicots. It contains 15 families and around 100 genera, with nearly 2,500 species. Well-known and economically important members of this order include saxifrages (after which the order is named), blackcurrants, redcurrants, gooseberries, peonies, liquidambars, witch-hazel, Persian ironwood, katsura, jade plant, houseleeks, and water milfoil. Of the 15 families, many are small, with eight of them being monotypic (having only a single genus). The largest family is the Crassulaceae (stonecrops), a diverse group of

The Aizoaceae, or fig-marigold family, are a large family of dicotyledonous flowering plants containing 135 genera and about 1,800 species. Several genera are commonly named ice plants or carpet weeds. The Aizoaceae are also referred to as vygies in South Africa. Some of the unusual Southern African genera—such as Conophytum, Lithops, Titanopsis, and Pleiospilos (among others)—resemble gemstones, rocks, or pebbles, and are sometimes called living stones or mesembs (short for mesembryanthemums).

Resedaceae is a family of mostly herbaceous dicotyledonous plants comprising 107 known species in 8 to 12 genera. 11 genera are currently accepted: Borthwickia W.W.Sm. - 1 species, sometimes placed in its own family Borthwickiaceae Caylusea A.St.-Hil. - 3 species Forchhammeria Liebm. - 10 species Ochradenus Delile - 8 species Ochradiscus S.Blanco & C.E.Wetzel - 2 species Oligomeris Cambess. - 3 species Randonia Coss. - 1 species Reseda Tourn. ex L. - ca 55 species Sesamoides Ortega - 1 species Stixis Lour. - 7 species Tirania Pierre – 1 species

Proteales is an order of flowering plants consisting of three (or four) families. The Proteales have been recognized by almost all taxonomists. The representatives of the Proteales can be very different from each other due to their very early divergence. They possess seeds with little or no endosperm. The ovules are often atropic. The oldest fossils of Proteales are of the nelumbonaceous genus Notocyamus from the Barremian stage of the Early Cretaceous of Brazil, 126–121 Ma (million years ago). According to molecular clock calculations, the lineage that led to Proteales split from other

Oxalidales is an order of flowering plants, included within the rosid subgroup of eudicots. This group comprises seven families that contain approximately 2000 species in 58 genera. They are trees, shrubs or woody vines which are found in the wet tropics, particularly on mountains, and warm temperate zones, especially in the southern hemisphere. Compound leaves are common in Oxalidales and the majority of the species in this order have five or six sepals and petals. The following families are typically placed here: Family Brunelliaceae Family Cephalotaceae (Cephalotus follicularis) Family

Commelinales is an order of flowering plants. It comprises five families: Commelinaceae, Haemodoraceae, Hanguanaceae, Philydraceae, and Pontederiaceae. All the families combined contain over 885 species in about 70 genera; the majority of species are in the Commelinaceae. Plants in the order share a number of synapomorphies that tie them together, such as a lack of mycorrhizal associations and tapetal raphides. Estimates differ as to when the Commelinales evolved, but most suggest an origin and diversification sometime during the mid- to late Cretaceous. Depending on the methods used, studies

Phyllanthaceae, commonly known as the leaf-flower family, is a family of flowering plants in the eudicot order Malpighiales. It is most closely related to the family Picrodendraceae. The Phyllanthaceae are most numerous in the tropics, with many in the south temperate zone, and a few ranging as far north as the middle of the north temperate zone. Some species of Andrachne, Antidesma, Margaritaria, and Phyllanthus are in cultivation. A few species of Antidesma, Baccaurea, Phyllanthus, and Uapaca bear edible fruit. Phyllanthaceae comprises about 2000 species. Depending on the author, these are

Murraya paniculata, commonly known as orange jasmine, orange jessamine, china box, cosmetic barktree, or mock orange, is a species of shrub or small tree in the family Rutaceae and is native to South Asia, Southeast Asia and Australia. It has smooth bark, pinnate leaves with up to seven egg-shaped to elliptical leaflets, fragrant white or cream-coloured flowers and oval, orange-red berries containing hairy seeds.

Pandanales, the pandans or screw-pines, is an order of flowering plants placed in the monocot clade in the Angiosperm Phylogeny Group and Angiosperm Phylogeny Web systems. Within the monocots Pandanales are grouped in the lilioid monocots where they are in a sister group relationship with the Dioscoreales. Historically the order has consisted of a number of different families in different systems but modern classification of the order is based primarily on molecular phylogenetics despite diverse morphology which previously placed many of the families in other groupings based on apparent

Spirogyra (common names include water silk, mermaid's tresses, and blanket weed) is a genus of filamentous charophyte green algae of the family Spirogyraceae, named for the helical or spiral arrangement of the chloroplasts that is characteristic of the genus. Spirogyra species, of which there are more than 500, are commonly found in freshwater habitats. Spirogyra measures approximately 10 to 150 micrometres in width (though not usually more than 60) and may grow to several centimetres in length.

Neottia ovata (formerly Listera ovata), the common twayblade or eggleaf twayblade, is a terrestrial orchid widespread across much of Europe and Asia.

Amomum subulatum, also known as black cardamom, hill cardamom, Bengal cardamom, greater cardamom, Indian cardamom, Nepal cardamom, winged cardamom, big cardamon, or brown cardamom, is a perennial herbaceous plant in the family Zingiberaceae. Its seed pods have a strong, camphor-like flavour, with a smoky character derived from the method of drying.

Staphyleaceae is a small family of flowering plants in the order Crossosomatales, native to Europe, temperate and tropical Asia and the Americas. The largest genus Staphylea, which gives the family its name, contains the "bladdernut" trees. The family includes three genera with more than 40 known species.

Eschscholzia californica, the California poppy, golden poppy, Mexican poppy, California sunlight or cup of gold, is a species of flowering plant in the family Papaveraceae, native to the United States and Mexico. It is cultivated as an ornamental plant flowering in summer (spring in southern Australia), with showy flowers in brilliant shades of red, orange and yellow (occasionally pink and white). It is also used as food or a garnish. It had various uses in indigenous herbalism. It became the official state flower of California in 1903.

Musa acuminata is a species of banana native to Southern Asia, its range comprising the Indian subcontinent and Southeast Asia. Many of the modern edible dessert bananas are derived from this species, although some are hybrids with Musa balbisiana. First cultivated by humans around 8000 BCE, it is one of the early examples of domesticated plants.

Chloranthaceae is a family of flowering plants (angiosperms), the only family in the order Chloranthales. It is not closely related to any other family of flowering plants, and is among the early-diverging lineages in the angiosperms. They are woody or weakly woody plants occurring in Southeast Asia, the Pacific, Madagascar, Central and South America, and the West Indies. The family consists of four extant genera, totalling about 77 known species according to Christenhusz and Byng in 2016. Some species are used in traditional medicine. The type genus is Chloranthus. The fossil record of the

Vochysiaceae is a plant family belonging to the order Myrtales.