Plants named in 1939

Cloves are the aromatic flower buds of a tree in the family Myrtaceae, Syzygium aromaticum. They are native to the Maluku Islands, or Moluccas, in Indonesia, and are commonly used as a spice, flavoring, or fragrance in consumer products, such as toothpaste, soaps, or cosmetics. Cloves are available throughout the year owing to different harvest seasons across various countries.

Sequoiadendron giganteum (also known as the giant sequoia, giant redwood, Sierra redwood or Wellingtonia) is a species of coniferous tree, classified in the family Cupressaceae in the subfamily Sequoioideae. Giant sequoia specimens are the largest trees on Earth. They are native to the groves on the western slopes of the Sierra Nevada mountain range of California but have been introduced, planted, and grown around the world. The giant sequoia is listed as an endangered species by the IUCN with fewer than 80,000 remaining in its native California. The giant sequoia grow to an average height of

Aruncus dioicus, known as goat's beard, buck's-beard or bride's feathers, is a flowering herbaceous perennial plant in the family Rosaceae, found in Europe, Asia, and eastern and western North America. It is the type species of the genus Aruncus. It has alternate, pinnately compound leaves, on thin, stiff stems, with plumes of feathery white or cream flowers borne in summer. The Latin specific epithet dioicus means "having the male reproductive organs on one plant, and the female on another".

Abies guatemalensis, the Guatemalan fir or pinabete, is an evergreen tree native to Central America and is the southernmost member of the genus Abies being spread to the south lower than 14° N. Its range is from southern (less from western and central) Mexico in the north to Honduras and El Salvador in the south. It is a warm-loving and moisture-loving tree of the tropical mountain coniferous and mixed cloud forests of these countries. The Guatemalan fir is an almost completely non-frost-resistant tree. Due to logging and loss of habitat, the tree is considered threatened and is protected in

Rhipsalis baccifera, commonly known as the mistletoe cactus, is an epiphytic cactus which originates in Central and South America, the Caribbean, and Florida. It is also found throughout the tropics of Africa and into Sri Lanka where it is known in Sinhala as nawahandi (නවහන්දි). This is the only cactus species naturally occurring outside the Americas. One hypothesis is that it was introduced to the Old World by migratory birds, long enough ago for the Old World populations to be regarded as distinct subspecies. An alternative hypothesis holds that the species initially crossed the Atlantic

Sequoiadendron is a genus of evergreen trees, with three species, only one of which survives to the present: Sequoiadendron giganteum, extant, commonly known as wellingtonia, giant redwood and giant sequoia, growing naturally in the Sierra Nevada mountains of California † Sequoiadendron chaneyi, the predecessor of Sequoiadendron giganteum, found mostly in the Nevada area of the Tertiary Colorado Plateau until the late Miocene †Sequoiadendron tchucoticum Late Cretaceous; Enmyvaam River Basin, Russia

Pilea cadierei (or the aluminium plant or watermelon pilea) is a species of flowering plant in the nettle family, Urticaceae. The species is endemic to the southern Chinese provinces of Guizhou and Yunnan, as well as Vietnam. The specific epithet cadierei refers to the 20th-century botanist R.P. Cadière. P. cadierei has earned the Royal Horticultural Society's Award of Garden Merit for its hardiness and reliability as a houseplant. In warmer countries, usually within USDA zones 8–12, the plant may be grown outside year-round as a perennial, either in-ground or contained, and pruned about 50%

Xerosicyos is a flowering plant genus of the family Cucurbitaceae. Its name comes from Greek xeros (meaning "dry") and sicyos ("cucumber"). There are six species, all endemic to Madagascar.

Heliamphora minor (Latin: minor = smaller) is a species of marsh pitcher plant endemic to Auyán-tepui in Venezuela. As the name suggests, it is one of the smallest species in the genus. It is closely related to H. ciliata and H. pulchella.

Farfugium japonicum (syn. Ligularia tussilaginea) is a species of flowering plant in the family Asteraceae, also known as leopard plant, green leopard plant or tractor seat plant. It is native to streams and seashores of Japan, where it is called tsuwabuki (石蕗).

Ligularia dentata, the summer ragwort or leopardplant, is a species of flowering plant in the genus Ligularia and the family Asteraceae, native to China and Japan.

Neltuma caldenia (formerly Prosopis caldenia), commonly known as the caldén, is a species of flowering tree in the family Fabaceae. The tree is endemic to subtropical regions of Argentina. It thrives in sandy and arid soil and resists drought, developing an extremely deep root system. The leaves of this tree are pinnately compound, deciduous, alternate and small. Its foliage is tortuous, with conical spines arranged in pairs at the nodes.

Mammillaria albilanata is a cactus species native to Mexico. The species is divided into four recognized subspecies: subsp. albilanata, subsp. oaxacana, subsp. reppenhagenii, and subsp. tegelbergiana. It occurs across the states of Chiapas, Colima, Guerrero, Oaxaca, and Puebla. This cactus typically grows as a solitary plant with a short, cylindrical form, although it can form clusters in cultivation. It can reach up to 15 cm in height and 8 cm in width. The flowers are small and colorful, ranging from carmine red to purplish pink, and are followed by red fruits with brown seeds. It is found

Eleutherococcus sieboldianus, the five-fingered aralia or fiveleaf aralia, is a species of flowering plant in the family Araliaceae. It is native to Anhui province in China, and has been introduced to Korea, Japan and the United States. A variegated form is available which only reaches 8 ft (2.4 m).

Cardamine concatenata, the cutleaved toothwort, crow's toes, pepper root or purple-flowered toothwort, is a flowering plant in the family Brassicaceae. It is a perennial woodland wildflower native to eastern North America.

Zombia antillarum, commonly known as the zombie palm, is a species of palm tree and the only member of the genus Zombia. It is endemic to the island of Hispaniola (both the Dominican Republic and Haiti) in the Greater Antilles. Usually found in dry, hilly areas of northern and southern Haiti and the northwest of the Dominican Republic, Z. antillarum is a relatively short fan palm with clustered stems and a very distinctive appearance caused by its persistent spiny leaf sheaths. Threatened by habitat destruction in Haiti, Z. antillarum is a popular ornamental species due to its distinctive

Tetrameranthus is a genus of plant in family Annonaceae. It contains 8 species, all occurring in South America. As of January 2025, Plants of the World Online accepts the following 8 species: Tetrameranthus duckei R.E.Fr. – Brazil North, Colombia, Peru, Venezuela Tetrameranthus globuliferus Westra (as Tetrameranthus globulifer) – Ecuador Tetrameranthus guianensis Westra & Maas – Brazil North, French Guiana Tetrameranthus laomae D.R.Simpson – Brazil North, Colombia, Peru Tetrameranthus macrocarpus R.E.Fr. – Colombia Tetrameranthus pachycarpus Westra – Peru Tetrameranthus trichocarpus Maas &

Syzygium antisepticum, or shore eugenia, is native to the floristic region of Malesia.

Syringodium isoetifolium, commonly known as noodle seagrass, is a species of flowering plant in the family Cymodoceaceae, growing underwater in marine habitats. It forms seagrass meadows in shallow sandy or muddy locations in the Indian and Pacific Oceans.

Pygmaeorchis is a genus of flowering plants from the orchid family, Orchidaceae. It contains two known species, both endemic to Brazil: Pygmaeorchis brasiliensis Brade - southeastern Brazil Pygmaeorchis seidelii Toscano & Moutinho - Minas Gerais

Platanus kerrii (Kerr's plane) is a rare and distinctive species of plane tree (sycamore) native to the tropical forests of Vietnam and Laos in Southeast Asia. It is the only extant member of the subgenus Castaneophyllum, and is the sister group to all other lineages within Platanus. Unlike all other plane trees, P. kerrii is evergreen and retains unlobed leaves throughout its adult life, with none developing the lobed form characteristic of other Platanus species. While some have speculated that P. kerrii might represent a living analogue of ancestral plane trees, no fossil material clearly

Eucalyptus crenulata, commonly known as Buxton gum, silver gum or Victorian silver gum, is a rare species of medium-sized tree that is found only in the wild in a small area in Victoria but is widely planted. It has rough, compacted bark on the trunk, sessile, egg-shaped to heart-shaped leaves arranged in opposite pairs, flower buds covered with a white, powdery bloom, white flowers and cup-shaped fruit.

Dialium guianense is a species of tree in the flowering plant family Fabaceae. The species occurs through North America (South Eastern Mexico), Central America and South America, and was an important source of food and wood for the ancient Mayans.

Acer tibetense is an uncommon Asian species of maple. It has been found only in Tibet. Acer tibetense is a deciduous tree up to 10 meters tall. Leaves are non-compound, up to 9 cm wide and 8 cm across, thin, usually with 3 lobes but no teeth.

Salvia blepharophylla (eyelash-leaved sage) is a creeping perennial from the Mexican states of San Luis Potosí and Tamaulipas. The epithet, blepharophylla, is from the Greek for "with leaves fringed like eyelashes". It is a rapidly spreading stoloniferous plant with 2.5 cm (0.98 in) long signal-red flowers with an orange undertone. The flowers grow in loose whorls spaced about 2.5 cm (0.98 in) apart, on 30 cm (12 in) long inflorescences. In full bloom the plant reaches 45 cm (18 in) in height.

Pseudodicliptera is a genus of flowering plants belonging to the family Acanthaceae. It includes four species endemic to Madagascar.

Neo-uvaria is a genus of flowering plants belonging to the family Annonaceae. Its native range is Indo-China to Western and Central Malesia. Species: Neo-uvaria acuminatissima (Miq.) Airy Shaw Neo-uvaria laosensis Tagane & Soulad. Neo-uvaria merrillii (C.B.Rob.) Chaowasku Neo-uvaria parallelivenia (Boerl.) H.Okada & K.Ueda Neo-uvaria sparsistellata Chaowasku Neo-uvaria telopea Chaowasku Neo-uvaria viridifolia (Elmer) Chaowasku

Monstera tuberculata is a species of flowering plant in the family Araceae. It is sometimes referred to by the common names giant Monstera or giant velvet-leaf Monstera. It is native to Belize, Costa Rica, Guatemala, Southeast and Southwest Mexico, Nicaragua, Panama and Veracruz. It grows in lowland wet tropical biomes up to 200 metres (660 ft) in elevation. Similar to Monstera dubia and a few other species in its genus, when young M. tuberculata has a shingle-like growth habit with leaves tightly pressed against the trunks of trees. As it matures, it has short-stemmed, oval leaves that lack

Fagus mexicana, the Mexican beech or haya, is a species of beech endemic to northeastern and central Mexico, where it occurs from Nuevo León, Tamaulipas south to Hidalgo, Veracruz and Puebla. It is restricted to Tropical montane cloud forests in the Sierra Madre Oriental. It is closely related to the American beech Fagus grandifolia and until recently was frequently treated as a subspecies of it, as Fagus grandifolia subsp. mexicana (Martínez) E.Murray. However, recent research has shown it differs in genetics, lacking some ancient introgression with Eurasian Fagus species which is present in

Encephalartos manikensis (Gorongo Cycad, Gorongowe Cycad) is a species of cycad that is native to Mozambique and Zimbabwe.