Plants named in 1951

Irvingiaceae is a small family of flowering plants, consisting of about 13 species; it was erected by Exell and Mendonça in 1951. The family and type genus were named after the Scottish naval surgeon, Edward George Irving.

Persian lime (Citrus × latifolia), also known by other common names such as seedless lime, Bearss lime, and Tahiti lime, is a citrus fruit species of hybrid origin, known only in cultivation. The Persian lime is a triploid cross between Key lime (Citrus × aurantiifolia) and lemon (Citrus × limon). Although there are other citrus species that are referred to as "limes", the Persian lime is the most widely cultivated lime species commercially, and accounts for the largest share of the fruits sold as limes. The fruit turns yellow as it ripens, but it is universally sold while still green.

Curtisia dentata (commonly known as the Assegai tree or Cape lancewood, Afrikaans: Assegaai, Xhosa: Umgxina, Zulu: Umagunda) is a flowering tree from Southern Africa. It is the sole species in genus Curtisia, which was originally classed as a type of "dogwood" (Cornaceae), but is now placed in its own unique family Curtisiaceae. It is increasingly popular as an ornamental tree for gardens, with dark glossy foliage and sprays of pure white berries. The bark of this tree is a very popular component of traditional African medicine, leading to overexploitation and a decline in the species in some

Phaeoceros laevis, the smooth hornwort, is a species of hornwort of the genus Phaeoceros. It is commonly found in areas where moisture is plentiful, such as moist soils in fields, the banks of streams and rivers or inundated beneath the surface of the rivers. It grows to a maximum height of about 5 millimetres and the plants are monoecious; the sex organs are visible on the dorsal surface. The thallus is nearly flat on the upper surface. It is of dark green and somewhat lustrous color, devoid of intercellular spaces. Its capsule is commonly 6 inches (150 mm) to 18 inches (460 mm) in length.

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Gentianopsis is a genus of flowering plants in the gentian family known commonly as fringed gentians. These are similar to the gentians of genus Gentiana. Most have flowers which are blue to purple in color. They may be annual or perennial. They are native to Eurasia and temperate North America.

Salvia dorrii, the purple sage, Dorr's sage, fleshy sage, mint sage, or tobacco sage, is a perennial spreading shrub in the family Lamiaceae. It is native to mountain areas in the western United States, particularly northwestern Arizona, New Mexico, and West Texas, found mainly in the Great Basin and southward to the Mojave Desert, growing in dry, well draining soils.

Quercus hinckleyi, commonly called Hinckley oak, is a rare species in the white oak group (Quercus Section Quercus). It has a restricted range in the Chihuahuan Desert of the southwestern United States and northern Mexico (Chihuahua and Coahuila). In the US, it occurs in only two counties in southwestern Texas and is federally listed as a threatened species.

Afroguatteria is a small genus of vines in the family Annonaceae, native to Cabinda, Cameroon and Zaire in west Africa.

Wallisia cyanea, or pink quill, is a species of plant of the genus Wallisia in the bromeliad family, native to the rainforests of Ecuador. An epiphytic perennial growing to 50 cm (20 in) high by 50 cm (20 in) wide, it has stemless rosettes of thin, recurved leaves and paddle-shaped spikes of 20 pink bracts with violet flowers, in spring and autumn. The Latin specific epithet cyanea means "blue", referring to the intense purple-violet hue of the flowers. With a minimum temperature of 7 °C (45 °F), this plant is often cultivated as a low-maintenance houseplant in temperate regions, often sold

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Phaeoceros is a genus of hornworts in the family Notothyladaceae. The genus is global in its distribution. Its name means 'yellow horn', and refers to the characteristic yellow spores that the plants produce in the horn-shaped sporophyte. The genus Phaeoceros was first recognized in 1951 by Johannes Max Proskauer. The type species is Phaeoceros laevis. The genus is distinguished by having yellow spores, different chloroplast structure, relatively less frilliness of the thallus when compared to Anthoceros, and a relative lack of internal cavities in Phaeoceros. The yellow color of the spores

Heliamphora heterodoxa (Greek: heteros = other, doxa = opinion, belief) is a species of marsh pitcher plant native to Venezuela and adjacent Guyana. It was first discovered in 1944 on the slopes interlinking Ptari-tepui and Sororopan-tepui and formally described in 1951. This Heliamphora is closely related to H. glabra and the latter was for a long time considered a form of H. heterodoxa. It is one of four Heliamphora taxa formally described by Julian A. Steyermark. Heliamphora heterodoxa is known to tolerate slightly higher temperatures compared to other Heliamphora species, due to its

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Toussaintia is a genus of flowering plants in the family Annonaceae. There are four species. All are native to Africa. Species include: Toussaintia congolensis Toussaintia hallei Toussaintia orientalis Toussaintia patriciae

Paphiopedilum micranthum, described in 1951, is commonly known as the silver slipper orchid or hard-leaved pocket orchid. It blooms during late winter to early summer with one flower per inflorescence. As opposed to its close sibling Paph. malipoense, the flowers of Paph. micranthum have no fragrance.

Myriocladus is a South American genus of bamboo in the grass family. It is found in the sandstone tablelands of Venezuela, Guyana, Suriname, and northern Brazil.

Hubbardia is a genus in the grass family that is endemic to India. It is the only genus in the tribe Hubbardieae of the subfamily Micrairoideae.

Encephalartos natalensis, the Natal cycad or giant cycad, is a species of cycad that is endemic to the Qumbu and Tabankulu areas of the northern part of the Eastern Cape, and through most of KwaZulu-Natal. The number of mature individuals of this species is declining and the International Union for Conservation of Nature has assessed its conservation status as being "near threatened".

Eggelingia is a genus of flowering plants from the orchid family, Orchidaceae, and named after the Scots forester, William Julius Eggeling. It contains 3 known species, all native to tropical Africa: Eggelingia clavata Summerh. Eggelingia gabonensis P.J.Cribb & Laan Eggelingia ligulifolia Summerh.

Phaeoceros carolinianus is a species of hornwort—a group of simple, non-vascular plants—that is found worldwide in damp, shaded areas. It forms flat, dark green, rosette-shaped patches measuring 10–20 mm in diameter on bare soil and rock surfaces. The plant is characterised by its horn-like spore capsules, which grow 40–60 mm tall, and for producing both male and female reproductive structures on the same plant (a monoicous condition). These features, along with its unique spore structure, distinguish it from closely related species like P. laevis. First described by the French botanist André

Lophopyxis is a genus of flowering plants and the sole genus of the family Lophopyxidaceae. The group consists of two species of tendrillate lianas. They are found in the Sunda Islands.

Fritillaria gentneri, or Gentner's fritillary, is a rare species of flowering plant in the lily family Liliaceae, that is endemic to southwest Oregon and adjacent Siskiyou County, California, USA. Its habitat is dry, open woodlands and chaparral at 1,000–5,000 ft (300–1,520 m), where it blooms from March through July. However, most populations have generally finished blooming by the end of May. As with many plants, the lower elevations bloom earliest with the bloom period moving up following elevation.

Eucomis autumnalis, the autumn pineapple flower, or autumn pineapple lily, is a species of flowering plant in the family Asparagaceae, subfamily Scilloideae, native to Malawi, Zimbabwe and southern Africa. It is a mid to late summer flowering deciduous bulbous perennial. The flower stem reaches about 40 cm (16 in), rising from a basal rosette of wavy-edged leaves. The green, yellow or white flowers are arranged in a spike (raceme), topped by a "head" of green leaflike bracts. It is grown as an ornamental garden plant and can also be used as a cut flower.

Encephalartos umbeluziensis is a species of cycad from Africa.

Elingamita is a genus in the plant family Primulaceae. It consists of a single species, Elingamita johnsonii, a tree or shrub endemic to the Three Kings Islands approximately 55 km north of the North Island of New Zealand. The entire world natural population of the tree is confined to a small rocky island and two nearby islets, and thus is vulnerable to destruction by fire or other unforeseen events. Elingamita johnsonii grows as a shrub or small tree in pōhutukawa (Metrosideros excelsa) forest and coastal scrub on West island. It also occurs on two rocky islets of the Princes Group; on one

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Pilopleura is a genus of flowering plants belonging to the family Apiaceae. Its native range is Central Asia. Species: Pilopleura goloskokovii (Korovin) Pimenov Pilopleura tordyloides (Korovin) Pimenov

Euphorbia clivicola is a species of plant in the family Euphorbiaceae native to southern Africa.

Encephalartos humilis is a species of cycad in the former Transvaal Province, South Africa.