Taxa described in 1800

Armoracia is a genus of flowering plants of the family Brassicaceae, native to the Palaearctic. Its best known member is horseradish, Armoracia rusticana, which is the type species.

Larrea is a genus of flowering plants in the caltrop family, Zygophyllaceae. It contains five species of evergreen shrubs that are native to the Americas. The generic name honours Bishop Juan Antonio Hernández Pérez de Larrea, a patron of science. South American members of this genus are known as jarillas and can produce fertile interspecific hybrids. One of the more notable species is the creosote bush (L. tridentata) of the southwestern United States and northwestern Mexico. The King Clone ring in the Mojave Desert is a creosote bush clonal colony estimated to be about 11,700 years old.

Aerospiza is a genus of goshawk and sparrowhawk in the family Accipitridae that are found in Africa. The two species in the genus were formerly placed in the genus Accipiter.

Onygena is the type genus of the fungal family Onygenaceae. The genus contains five species found in North America and Europe that grow on bones and feathers.

Stictis is a genus of fungi in the family Stictidaceae. Most species are saprotrophic decomposers that inhabit dead wood, where they form small, flask-shaped fruiting bodies that remain largely embedded within their substrate and open through tiny pores. The genus is characterised by its distinctive white, frost-like rim that surrounds the fruiting bodies and thread-like ascospores divided by multiple cross-walls. Modern molecular phylogenetics studies suggest that the current broad concept of Stictis will likely be split into several separate genera as the group undergoes taxonomic revision.

Notopterus is a genus of fishes in family Notopteridae found in South Asia:Pakistan, India, Nepal and Bangladesh (N. synurus) and Southeast Asia: Myanmar, Indonesia, Malaysia, Laos, Thailand, Cambodia and Vietnam (N. notopterus).