Plants named in 1921

Orthilia is a genus of flowering plants in the family Ericaceae. It has only one species, Orthilia secunda. Its common names are sidebells wintergreen, one-sided-wintergreen and serrated-wintergreen. It is also called one-sided pyrola, one-sided shinleaf, and one-sided wintergreen. It was previously part of genus Pyrola, the wintergreens. The plant has a circumboreal distribution, growing throughout much of the Northern Hemisphere. The American wintergreen, Gaultheria procumbens, belongs to a different genus.

Sophora toromiro, commonly known as toromiro, is a species of flowering tree in the legume family, Fabaceae, that is endemic to Easter Island. Sophora toromiro is extinct in the wild due to overharvesting and overgrazing, but some individuals survive in botanical and private collections. It holds significant cultural importance for the Rapa Nui people, known for its statues, ceremonial objects, and other tools made from the wood. The species serves as proof that human intervention of a natural environment can drastically change the composition of native flora negatively, even to the point of

Veronica catenata, the pink water speedwell, is a species of flowering plant in the family Plantaginaceae. It is native to Canada, the United States, Europe, the Azores, and northern Africa. As its common name implies, it prefers growing in or near marshes, rivers, lakes and ponds.

Epipactis leptochila, the narrow-lipped helleborine, is a species of orchid in the genus Epipactis, which is found in chalk or limestone-based beech and hornbeam woodland in southern England and Wales. The narrow-lipped helleborine blooms from early June to mid-August. Epipactis leptochila is also found in parts of northern Europe. Due to habitat loss, the species is scarce and declining in the United Kingdom, where it can mainly be found in the Cotswolds and the Chiltern Hills.

Epipactis muelleri is a species of orchid. This species is native to many countries in Europe. The species is threatened by destruction of forests with its population on decline, although the overall risk of its extinction on a global level is very low.

Pinus krempfii, or Krempf's pine, is a rare species of pine, endemic to the central highlands of Vietnam in the Da Lat–Nha Trang area. It is unusual in that it has flat needles. Because of this anomaly, it is put in its own subsection, the Krempfianae. In adult trees these needles are up to 4 mm (0.16 in) wide, "but much larger on juveniles". The tree is a rainforest emergent to 55 m (180 ft) in height and up to 2 m (6 ft 7 in) DBH.

Telosma cordata (Chinese: 夜來香; lit. 'night-blooming fragrance') is a species of flowering plant in the family Apocynaceae (tribe Marsdenieae), native to China and Indo-China. It is cultivated elsewhere and may occur wild as an introduced species. Common names include Chinese violet, cowslip creeper, Pakalana vine, Tonkin jasmine and Tonkinese creeper. The plant bears clusters of golden yellow blooms along the vining stems during summer months. Individual blooms emerge successively over a period of weeks emitting a rich, heavy fragrance during the day and night.

Aristotelia serrata, commonly known as wineberry or in the Māori language makomako or mako, is a small tree in the family Elaeocarpaceae, in the genus Aristotelia, found in the North Island, South Island and Stewart Island of New Zealand. It is a small deciduous fast-growing tree or shrub. The tree can reach up to 10m tall, with a trunk diameter up to 30 cm. The bark is pale brown, smooth and patterned with flat lenticels. Branches are long, slender and spreading, branchlets have a reddish-brown colour when pubescent. First described by botanists Georg and Johann Foster in 1776 as Dicera

Tribulocarpus is a genus of flowering plants belonging to the family Aizoaceae. Its native range is Ethiopia to Southern Africa.

Euphorbia antso is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitat is subtropical or tropical dry shrubland. It is threatened by habitat loss.

Rhododendron kanehirai is a species of plant in the family Ericaceae. It was originally endemic to Taiwan. It has become extinct in the wild, though it still exists in cultivated form. Botanic collections include those at Logan Botanic Garden where the Rhododendron is grown for preservation and display.

Rhododendron atlanticum, the dwarf azalea or coastal azalea, is a species of Rhododendron native to coastal areas of the eastern United States, from New Jersey south to Georgia. It is a very tough plant, responding to overgrazing or forest fires by generating new shoots.

Sophora fernandeziana is a species of flowering plant in the family Fabaceae, that is endemic to the Juan Fernández Islands of Chile. It is threatened by habitat loss.

Quercus austrocochinchinensis is an uncommon species of tree in the beech family Fagaceae. It has been found in Vietnam and Thailand as well as Yunnan Province in southern China. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus austrocochinchinensis is a tree up to 15 m. tall, with brown twigs and leaves as much as 200 mm long. The acorn is oblate, 11-14 × 13-18 mm, angular, yellowish-brown tomentose, with rounded apex; the scar is approx. 12 mm in diameter.

Phalaenopsis fimbriata is a species of orchid native to Borneo, Java and Sumatra.

Euphorbia caput-aureum is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitat is rocky areas.

Euphorbia brachyphylla is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitat is known to be primarily rocky areas. The main threat to this species is habitat loss.

Quercus chevalieri is an uncommon species of tree in the beech family Fagaceae. It has been found in Vietnam and also in southern China, in the Provinces of Guangdong, Guangxi, and Yunnan. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus chevalieri is a tree up to 20 m. tall with leaves as much as 110 mm long. The acorn is ovoid to oblong-ellipsoid, 10-15 (sometimes 20) × 6-8 (sometimes 15) mm, glabrous; the scar is approx. 5 mm in diameter. Some authors have misapplied this name to another plant, Cyclobalanopsis augustinii var. nigrinux (H.H. Hu) M. Deng & Z.K. Zhou.

Pritchardia hardy, the Makaleha pritchardia, is a species of palm tree that is endemic to moist forests on the island of Kauaʻi at elevations below 2,000 feet (610 m). The trunk of this fast-growing species reaches a height of 80 feet (24 m), with a diameter of 1 foot (0.30 m). Its leaves are 3 feet (0.91 m) in length. In 1998 only 30 individuals remained in the wild along a single trail on Kauai. This is a federally listed endangered species of the United States.

Persoonia levis, commonly known as the broad-leaved geebung, is a shrub native to New South Wales and Victoria in eastern Australia. It reaches 5 m (16 ft) in height and has dark grey papery bark and bright green asymmetrical sickle-shaped leaves up to 14 cm (5.5 in) long and 8 cm (3.2 in) wide. The small yellow flowers appear in summer and autumn (December to April), followed by small green fleshy fruit, which are classified as drupes. Within the genus Persoonia, it is a member of the Lanceolata group of 58 closely related species. P. levis interbreeds with several other species where they

Euphorbia biaculeata is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitat is subtropical or tropical dry shrubland. It is threatened by habitat loss.

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Cymbopogon ambiguus, or Australian lemon-scented grass, is a plant species in the family Poaceae. It has fragrant, bluish-green grey leaves and fluffy seed heads. It is self-fertile.

Bulbophyllum echinochilum is a species of orchid in the genus Bulbophyllum.

Bulbophyllum catenulatum is a species of orchid in the genus Bulbophyllum.

Alistilus is a genus of flowering plants in the legume family, Fabaceae. It belongs to the subfamily Faboideae. It includes three species native to southern Africa and Madagascar. Alistilus bechuanicus N.E.Br. – Namibia, Botswana, South Africa (Northern Provinces) Alistilus jumellei (R. Vig.) Verdc. – south-central and southern Madagascar Alistilus magnificus Verdc. – south-central Madagascar

Aa riobambae is a species of orchid in the genus Aa. It is native to Ecuador, where it grows at altitudes of 3,300 to 3,800 meters.

Aa macra is a species of orchid in the genus Aa. It is found in Ecuador.

Tirpitzia is a genus of flowering plants belonging to the family Linaceae. It is also in the subfamily Linoideae. Its native range is southern China to Vietnam and Taiwan. The genus name of Tirpitzia is in honour of Alfred von Tirpitz (1849–1930), a German grand admiral, Secretary of State of the German Imperial Naval Office. It was first described and published in Beih. Bot. Centralbl. Vol.39 (Issue 2) on page 5 in 1921.

Sophora masafuerana is a species of flowering plant in the family Fabaceae, that is endemic to the Juan Fernández Islands of Chile. It is threatened by habitat loss.