Plants named in 1973

Noccaea caerulescens (previously Thlaspi caerulescens), the alpine penny-cress or alpine pennygrass, is a flowering plant in the family Brassicaceae. It is found in Scandinavia and Europe.

Myriophyllum aquaticum is a flowering plant, a vascular dicot, commonly called parrot's-feather and parrot feather watermilfoil.

Helminthotheca echioides, known as bristly (or prickly) oxtongue, is a sprawling annual or biennial herb native to Europe and North Africa. It was originally placed within the genus Picris but is often separated within the small genus Helminthotheca alongside a few other (mainly North African) plants which also have the distinctive outer row of bracts around the flowerheads. It is a ruderal plant, found on waste ground and agricultural soils around the world, and in some places it is considered a troublesome weed.

Dittrichia viscosa, also known as false yellowhead, woody fleabane, sticky fleabane and yellow fleabane, is a flowering plant in the daisy family. Dittrichia viscosa is a highly branching perennial common throughout the Mediterranean Basin. It has long, narrow leaves that are pointed at both ends and have teeth along the edges and glandular hairs on the surfaces. One plant can produce many yellow flower heads each with as many as 16 ray florets and 44 disc florets. Originally, the species was found mainly in dry riverbeds and abandoned fields up to a 1500 m (5000 feet) elevation. Nowadays it

Anemonastrum narcissiflorum, the narcissus anemone or narcissus-flowered anemone, is a herbaceous perennial in the genus Anemonastrum and the buttercup family. Basionym: Anemone narcissiflora Hook. & Arn.

Dittrichia is a genus of flowering plants in the daisy family. Its species were formerly included in the genus Inula. Dittrichia is named after German botanist Manfred Dittrich (1934-2016), the previous director of the herbarium at the Botanical Garden in Berlin. Species Dittrichia graveolens, stinkwort, sticky stinkweed - Mediterranean region (southern Europe + North Africa) plus southwest Asia as far east as Pakistan; naturalized in California, Asia, Africa, Australia, and other places Dittrichia viscosa, false yellowhead, yellow fleabane - Mediterranean region (southern Europe + North

Botrypus virginianus, synonym Botrychium virginianum, sometimes called rattlesnake fern is a species of perennial fern in the adders-tongue family. It is monotypic within the genus Botrypus, meaning that it is the only species within the genus. It is called the rattlesnake fern in some parts of North America, due to its habit of growing in places where rattlesnakes are also found. Rattlesnake fern prefers to grow in rich, moist woods in dense shade and will not tolerate direct sunlight.

Helichrysum petiolare, the licorice-plant or liquorice plant, is a species of flowering plant in the family Asteraceae. It is a subshrub native to the Cape Provinces of South Africa — where it is known as impepho — and to Angola, Zambia, and Zimbabwe. It is naturalized in parts of Portugal and the United States. Growing to about 45 cm (18 in) high and 150 cm (59 in) broad, it is a trailing evergreen subshrub with furry grey-green leaves and small white flowers. Other common names include silver-bush everlastingflower, trailing dusty miller and kooigoed. The foliage has a faint licorice aroma,

Nepenthes campanulata (; from Late Latin campānulātus "bell-shaped"), the bell-shaped pitcher-plant, is a tropical pitcher plant native to Borneo. It has also been reported from Palawan, the Philippines, though further field work is needed to confirm this identification. Forest fires destroyed the only known population of N. campanulata in 1983 and it was uncertain whether the species had survived elsewhere or was in fact extinct. It was rediscovered in 1997, several hundred kilometres from the type locality. Nepenthes campanulata is listed as Vulnerable on the 2014 IUCN Red List of

Dittrichia graveolens, commonly known as stinkwort or stinking fleabane, is a plant species in the sunflower family, native to southern Europe, North Africa, and western Asia as far east as Pakistan. It has become naturalized in California, Asia, Africa, Australia, and other places and is regarded as a noxious weed in some regions. It is a classified as an invasive species in California, and a potential threat to wine production in the state. The plant is a branching subshrub growing up to 130 centimetres (51 inches) tall, with an aromatic, camphor smell. Leaves are long and narrow, pointed

Tephroseris integrifolia (vernacular name: field fleawort) is a species of flowering plant belonging to the family Asteraceae. Its native range is Europe to Siberia and Iran. Synonym: Senecio integrifolius (L.) Clairv. Subspecies: Tephroseris integrifolia subsp. maritima (Syme) B.Nord.

Pabstia is a genus of flowering plants from the orchid family, Orchidaceae.

Photinia serratifolia (syn. Photinia serrulata), commonly called Taiwanese photinia or Chinese photinia is a flowering shrub or tree in the flowering plants family Rosaceae, found in mixed forests of China, Taiwan, Japan, the Philippines, Indonesia, and India.

Persicaria mitis (Schrank) Assenov is a species of flowering plant in the family Polygonaceae, native to Europe. (Persicaria mitis Delarbre is a different species, being a rejected synonym of Persicaria maculosa.)

Sinacalia is a genus of Chinese plants in the groundsel tribe within the daisy family. Species Sinacalia caroli (C.Winkl.) C.Jeffrey & Y.L.Chen - Gansu, Sichuan Sinacalia davidii (Franch.) H.Koyama - Shaanxi, Sichuan, Tibet, Yunnan Sinacalia macrocephala (H.Rob. & Brettell) C.Jeffrey & Y.L.Chen - Hubei Sinacalia tangutica (Maxim.) B.Nord - Gansu, Hebei, Henan, Hubei, Hunan, Ningxia, Qinghai, Shaanxi, Shanxi, Sichuan

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Anemonoides trifolia (syn. Anemone trifolia), the three-leaved anemone, is a perennial herbaceous plant in the buttercup family (Ranunculaceae).

Melocactus conoideus is a species of plant in the family Cactaceae. It is a succulent cactus subshrub endemic to northeastern Brazil. It is native to the Serra do Periperi of Vitória da Conquista municipality in southwestern Bahia state. It grows in the transition from eastern Caatinga dry shrubland to campo rupestre montane savanna from 1,000 to 1,200 meters elevation. This species spreads by bearing fruit with seeds that ants take and transport to other locations that it can grow. It is threatened by habitat loss, and the IUCN Red List assesses the species as Critically Endangered.

Fragaria iturupensis, the Iturup strawberry, is a species of wild strawberry, endemic to Iturup in the Kuril Islands. It is noted to have relatively large berries for a wild species, similar in appearance to those of Fragaria virginiana.

Anakasia simplicifolia is a species of plant in the family Araliaceae, the only species of the genus Anakasia. It is endemic to Western New Guinea.

Aethionema retsina is a species of flowering plant in the family Brassicaceae. It is a subshrub endemic to Greece, where it is native to the islands of Skyros and Skyropoula in the central Aegean. Its natural habitats are Mediterranean-type shrubby vegetation and rocky shores. It is threatened by habitat loss.

Rhipidocladum is a genus of New World woody bamboo in the grass family. It is found in Mesoamerica, Trinidad, and South America. The genus is characterized by having erect, non-pseudopetiolate culm leaves, numerous branchlets arising in an aspidate (fan-like) array, and by having true caryopses as fruit. The name is derived from the Greek rhipid meaning "fanlike" and clad meaning "branch".

Microsorum scolopendria, synonym Phymatosorus scolopendria, commonly called monarch fern, musk fern, maile-scented fern, breadfruit fern, or wart fern is a species of fern within the family Polypodiaceae. This fern grows in the wild in the Western Pacific rim from Australia to New Caledonia to Fiji and throughout the South Pacific to French Polynesia. The scientific name M. scolopendria has been misapplied to Microsorum grossum (and their synonyms in Phymatosorus).

Peperomia columella is a species of plant in the family of Piperaceae. The species is endemic to Peru. It grows in dry areas, often in crevices on steep cliffs or in sandy soil. It grows to about 20 cm in height, forming snake-like stems, which carry closely packed, succulent bright green leaves. The leaves are truncated, U-shape in cross-section, with epidermal windows on top. It can be kept as a houseplant and has received the Award of Garden Merit by the Royal Horticultural Society.

Paphiopedilum primulinum is a species of orchid endemic to Sumatra (southern Aceh). It is endangered and high demand as it is a sequential blooming plant (ever-bloomer). It requires high indirect sunlight and should be water often before the soil dries out.

Melocactus deinacanthus, also known as the Wonderfully Bristled Turk's-Cap Cactus is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitat is rocky areas. It is threatened by habitat loss.

Citrus halimii, or mountain citron, is a citrus with sour fruit. Historically placed within the polyphyletic grouping of papedas, it has since been determined to be a wild species most closely related to the kumquats, and is not related to the true citron. It was first discovered and catalogued in 1973.

Christella dentata is a small fern with widespread distribution in Australia and islands in the south Pacific Ocean. There are many local common names. In New South Wales it grows north from the southern Illawarra region and is known as binung. Found on the margins of rainforest, by streams or in more open forests with adequate moisture. Sori are circular in shape, with a hairy closed covering. It was the first species of fern to become naturalised on the Hawaiian Islands, recorded initially in Oahu in 1887 and now found on all major islands there. There it interbreeds with the local species

Bulbophyllum taiwanense is a species of orchid in the genus Bulbophyllum. It is a pseudobulbous epiphyte endemic to Taiwan. Its inflorescence has 2.4-4" in length with 5-8 orange flowers, each is 1.5" in length.

Bulbophyllum albociliatum is a species of orchid in the genus Bulbophyllum. It is a pseudobulbous epiphyte endemic to Taiwan.