Plants named in 1811

Elettaria cardamomum, commonly known as green cardamom or true cardamom, is a herbaceous, perennial plant in the ginger family, native to southern India. It is the most common of the species whose seeds are used as a spice called cardamom that has a strong aroma used in both savory and sweet cooking. It is cultivated widely in tropical regions and reportedly naturalized in Réunion, Indochina, and Costa Rica.

The Simaroubaceae, also known as the quassia family, are a small, mostly tropical, family in the order Sapindales. In recent decades, it has been subject to much taxonomic debate, with several small families being split off. A molecular phylogeny of the family was published in 2007, greatly clarifying relationships within the family. Together with chemical characteristics such as the occurrence of petroselinic acid in Picrasma, in contrast to other members of the family such as Ailanthus, this indicates the existence of a subgroup in the family with Picrasma, Holacantha, and Castela. The

Calotropis gigantea, the crown flower, is a species of Calotropis native to India, Cambodia, Vietnam, Bangladesh, Indonesia, Malaysia, Philippines,Thailand, Sri Lanka, China, Pakistan, and Nepal. It is a large shrub growing to 4 m (13 ft) tall. It has clusters of waxy flowers that are either white or lavender in colour. Each flower consists of five pointed petals and a small "crown" rising from the center which holds the stamens. The aestivation found in calotropis is valvate i.e. sepals or petals in a whorl just touch one another at the margin, without overlapping. The plant has oval, light

Silene dioica (syn. Melandrium rubrum), known as red campion and red catchfly, is a herbaceous flowering plant in the family Caryophyllaceae, native to Europe and introduced to the Americas.

Ochnaceae is a family of flowering plants in the order Malpighiales. In the APG III system of classification of flowering plants, Ochnaceae is defined broadly, to include about 550 species, and encompasses what some taxonomists have treated as the separate families Medusagynaceae and Quiinaceae. In a phylogenetic study that was published in 2014, Ochnaceae was recognized in the broad sense, but two works published after APG III have accepted the small families Medusagynaceae and Quiinaceae. These have not been accepted by APG IV (2016). In this article, "Ochnaceae" will refer to the larger

Calotropis procera is a species of flowering plant in the family Apocynaceae that is native to Northern and Tropical Africa, Western Asia, South Asia and Indochina (mainland Southeast Asia). It typically reaches a height between 6 feet (1.8 m) to 8 feet (2.4 m), and rarely to as high as 15 feet (4.6 m), and grows in sunny to partly-shaded habitats such as disturbed and overgrazed lands, rangeland, roadsides, river flats and coastal dunes. Its green fruits contain a toxic milky sap that is extremely bitter and turns into a latex-like substance, which is resistant to soap. Common names for the

Silene coronaria, the rose campion, is a species of flowering plant in the family Caryophyllaceae, native to Eurasia. Other common names include dusty miller (which also refers to Centaurea cineraria and Jacobaea maritima), mullein-pink and bloody William. In the United Kingdom it is still widely referenced under its synonym Lychnis coronaria.

Elettaria is a genus of flowering plants in the family Zingiberaceae. They are native to India and Sri Lanka, but cultivated and naturalized elsewhere. One member of the genus, E. cardamomum, known as green cardamom or true cardamom, is a commercially important spice used as a flavouring agent in many countries. In 2018, several species were removed from Elettaria and placed in a new genus called Sulettaria. These species are recognized as of October 2018: A phylogenetic analysis published in 2024 found that Elettaria was a well-defined clade of seven species native to India and Sri Lanka,

Corydalis cava is a species of flowering plant in the family Papaveraceae, native to moist, shady, woodland habitats throughout most of mainland Europe, although commonest in central and southeast Europe. Its range extends from Spain in the west to Ukraine, Belarus and the Caucasus in the east and as far north as Sweden. It is absent from (though may sometimes be found in a naturalised state in) Iceland, the UK, the Netherlands, Norway, Finland, Russia and Greece.

Pittosporum tobira is a species of sweet-smelling flowering plant in the pittosporum family Pittosporaceae known by several common names, including Australian laurel, Japanese pittosporum, mock orange and Japanese cheesewood. It is native to Japan (south of Kanto), China, Taiwan, and Korea, but it is used throughout the world as an ornamental plant in landscaping and as cut foliage.

Luzula sylvatica, commonly known as greater wood-rush or great wood-rush, is a perennial flowering plant in the rush family Juncaceae.

Luzula multiflora, the common woodrush or heath wood-rush, is a species of flowering plant in the rush family. It is native to Europe, eastern Asia, northern Africa, northern North America, including Canada, and in northern regions of the United States. The native status of common woodrush is under some debate. While Flora of North America list it as introduced, the more common opinion is it is a circumpolar species native in North America and in parts of Europe and Asia. The taxonomy of the wood rush complex involving several Luzula spp. has a history of instability. In the past, common

Gymnema sylvestre is a perennial woody vine native to Asia (including the Arabian Peninsula), Africa and Australia. It has been used in Ayurvedic medicine. Common names include gymnema, Australian cowplant, and Periploca of the woods, and the Hindi term gurmar, which means "sugar destroyer" The leaves and extracts contain gymnemic acids, the major bioactive constituents that interact with taste receptors on the tongue to temporarily suppress the taste of sweetness.

Rosa banksiae, common names Lady Banks' rose, or just Banks' rose, is a species of flowering plant in the rose family, native to central and western China, in the provinces of Gansu, Guizhou, Henan, Hubei, Jiangsu, Sichuan and Yunnan, at altitudes of 500–2,200 m (1,600–7,200 ft). The rose is named for Dorothea Lady Banks, the wife of botanist Sir Joseph Banks.

Alisma gramineum is a small aquatic plant in the water-plantain family. It has several common names including narrowleaf water-plantain, ribbonleaf water-plantain or ribbon-leaved water-plantain, and grass-leaved water-plantain. It grows in mud or submerged in shallow fresh or brackish water in marshy areas.

Thermopsis is a genus of legumes, native to temperate North America and east Asia. They are herbaceous perennials and are known as goldenbanners or false-lupines.

Gomphocarpus fruticosus (swan plant; narrow-leaved cotton bush) is a species of plant native to South Africa. It is also common in Australia and New Zealand where it is a host of the monarch butterfly. The plant's tissues contain sufficient cardenolides that consumption of significant quantities of the plant's leaves, stems, or fruit may lead to death in livestock and humans. The plant, also referred to as Narrow leaf cotton bush, has officially been declared a pest in Western Australia. The species is closely related to Gomphocarpus physocarpus.

Hydrilla (waterthyme) is a genus of aquatic plants, usually treated as containing just one species — Hydrilla verticillata, but some botanists divide it into several species. It is native to the cool and warm waters of the Old World in Asia, Africa, and Australia, with a sparse, scattered distribution; in Australia it occurs from the Northern Territory to Queensland and New South Wales. The stems grow up to 2 m long. The leaves are arranged in whorls of two to eight around the stem, each leaf 5–20 mm long and 0.7–2 mm broad, with serrations or small spines along the leaf margins; the leaf

Hemidesmus indicus, Indian sarsaparilla, is a species of plant found in South Asia. It occurs over the greater part of India, from the upper Gangetic plain eastwards to Assam and in some places in central, western and South India. The root is a substitute for sarsaparilla (the dried root of the tropical species of Smilax, Smilacaceae; in India Smilax aspera L., and Smilax ovalifolia Roxb.). It should be distinguished from Mexican sarsaparilla Smilax aristolochiifolia Mill. and Jamaican sarsaparilla Smilax ornata Hook.f..

Moehringia trinervia, commonly known as apetalous sandwort or three-nerved sandwort, is a herbaceous flowering plant in the family Caryophyllaceae. A native of Eurasia, it has been introduced into North America.

Leonotis nepetifolia, (also known as klip dagga, Christmas candlestick, or lion's ear), is a species of plant in the genus Leonotis and the family Lamiaceae (mint), native to tropical Africa and the Indian Subcontinent. It can also be found growing abundantly in much of Latin America, Southeast Asia, the West Indies, and the Southeastern United States. It grows to a height of 3 metres (9 ft 10 in) and has whorls of striking lipped flowers, that are most commonly orange, but can vary to red, white, and purple. It has drooping dark green, very soft serrated leaves that can grow up to 10

Corydalis solida, fumewort or bird-in-a-bush, is a species of flowering plant in the family Papaveraceae, native to moist, shady habitats in northern Europe and Asia. Growing to 25 cm (10 in), it is a spring ephemeral, with foliage that appears in spring and dies down to its tuberous rootstock in summer. It is cultivated for its deeply divided, ferny leaves and narrow, long-spurred flowers which appear in spring. The flowers show color variation, and may be mauve, purple, red, or white.

Lolium rigidum is a species of annual grass. Common names by which it is known include annual ryegrass, a name also given to Italian ryegrass (Lolium multiflorum), rigid ryegrass, stiff darnel, Swiss ryegrass and Wimmera ryegrass. It is a native of southern Europe, northern Africa, the Middle East and the Indian subcontinent and is grown as a forage crop, particularly in Australia, where it is also a serious and economically damaging crop weed.

Leonotis leonurus, also known as wild dagga and lion's ear, is a plant species in the mint family Lamiaceae. It is a broadleaf evergreen shrub, native to South Africa, where it is very common, with a wide altitudinal range from 5 m up to 1980 m. It is known for its medicinal properties. The main psychoactive component of Leonotis leonurus is hypothesized to be related to the presence of leonurine or labdanes; Leonotis leonurus has been confirmed to contain leonurine according to peer reviewed journal published phytochemical analysis. Like other plants in the mint family, it also contains

Hopea odorata is a species of tree in the plant family Dipterocarpaceae. It is found in Bangladesh, Cambodia, India, Laos, Malaysia, Singapore, Myanmar, Thailand, and Vietnam.

Hopea is a genus of plants in the family Dipterocarpaceae. It contains some 114 species, distributed from Sri Lanka and southern India to the Andaman Islands, Myanmar, southern China, and southward throughout Malesia to New Guinea. They are mainly main and subcanopy trees of lowland rainforest, but some species can become also emergent trees, such as Hopea nutans. The genus was named after John Hope, the first Regius Keeper of the Royal Botanic Garden, Edinburgh.

Festuca valesiaca, the Volga fescue, is a species of flowering plant in the family Poaceae. It is native to Europe and Asia. It was introduced to North America when it was deliberately planted. There it can be found in such US states as Arizona, Kansas, Montana, Vermont and Wyoming.

Sparganiaceae is a family of flowering plants. Such a family was previously recognized by most taxonomists. The APG II system, of 2003 (unchanged from the APG system, 1998), also recognizes this family, and assigns it to the order Poales in the clade commelinids, in the monocots. The family consists of only one genus Sparganium of fewer than two dozen species, perennial plants of wet habitats. By the APG III system of 2009, Sparganium had been found to be fairly closely related to Typha, and so was placed with that genus in family Typhaceae. The Cronquist system, of 1981, also recognized such

Geodorum, commonly known as shepherds' crooks or 地宝兰属 (di bao lan shu), is a genus of eight species of flowering plants in the orchid family, Orchidaceae. They are deciduous, terrestrial herbs with underground pseudobulbs, broad, pleated leaves and small to medium-sized, tube-shaped or bell-shaped flowers on a flowering stem with a drooping end. Species in this genus are found in southern Japan, tropical Asia, Australia and islands of the southwest Pacific Ocean.

Carex punctata, the dotted sedge, is a species of flowering plant in the Cyperaceae family. It is native to Macaronesia, northwest Africa, southern, central, and northern Europe, and Turkey. Its chromosome number is 2n=68.