Plants named in 1999

The Pezizales are an order of the subphylum Pezizomycotina within the phylum Ascomycota. The order contains 16 families, 199 genera, and 1683 species. It contains a number of species of economic importance, such as morels, the black and white truffles, and the desert truffles. The Pezizales can be saprobic, mycorrhizal, or parasitic on plants. Species grow on soil, wood, leaves and dung. Soil-inhabiting species often fruit in habitats with a high pH and low content of organic matter, including disturbed ground. Most species occur in temperate regions or at high elevation. Several members of

Florideophyceae is a class of exclusively multicellular red algae. They were once thought to be the only algae to bear pit connections, but these have since been found in the filamentous stage of the Bangiaceae. They were also thought only to exhibit apical growth, but there are genera known to grow by intercalary growth. Most, but not all, genera have three phases to the life cycle. In the subclass Nemaliophycidae there are three orders, Balbianiales, Batrachospermales, and Thoreales, which lives exclusively in freshwater. When alive, the Florideophyceae appear bright red or even violet.

Himantoglossum robertianum is a species of flowering plant in the orchid family (Orchidaceae) native to the Mediterranean Basin.

Curio rowleyanus, syn. Senecio rowleyanus, is a flowering plant in the daisy family Asteraceae. It is a creeping, perennial, succulent vine native to the Cape Provinces of South Africa. In its natural environment its stems trail on the ground, rooting where they touch and form dense mats. It often avoids direct sunlight by growing in the shade of other plants and rocks. It is commonly known as string-of-pearls or string-of-beads. "String-of-beads" and several other common names are shared with Curio herreanus (string of watermelons), which has teardrop-shaped leaves, rather than spherical.

Cheirolophus crassifolius, the Maltese centaury, Maltese rock-centaury or Widnet il-Baħar, is a species of flowering plant in the family Asteraceae. It is endemic to Malta. Its natural habitats are cliffs and coastal valleys. It is threatened by habitat loss. It is scarce but widespread in the wild on the western cliffs of Malta, rare on the southern cliffs of Gozo, but frequent as a cultivated species in roundabouts. It is quite common in the limits of Wied Babu in the south east of Malta. It was first described by Stefano Zerafa, around 1830, as the only species of the monotypic genus

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Myrica pensylvanica, the northern bayberry, is a species of Myrica native to eastern North America, from Newfoundland west to Ontario and Ohio (locally endangered), and south to North Carolina. It is also classified as Morella pensylvanica. Myrica pensylvanica is a deciduous shrub growing to 4.5 m tall. The leaves are 2.5–7 cm long and 1.5-2.7 cm broad, broadest near the leaf apex, serrate, and sticky with a spicy scent when crushed. The flowers are borne in catkins 3–18 mm long, in range of colors from green to red. The fruit is a wrinkled berry 3–5.5 mm diameter, with a pale blue-purple

Euphorbia bemarahaensis is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. It is threatened by habitat loss.

Parkinsonia praecox (syn. Cercidium praecox), the palo brea or Sonoran palo verde, is a species of flowering plant in the family Fabaceae. It is native to the dry Neotropics from Mexico to Argentina. A small tree reaching 6 to 9 m (20 to 30 ft), it is usually a bit wider than it is tall.

Nepenthes benstonei is a tropical pitcher plant endemic to Peninsular Malaysia, where it grows at elevations of 150–1350 m above sea level. The specific epithet benstonei honours botanist Benjamin Clemens Stone, who was one of the first to collect the species.

Leptecophylla is a genus of flowering plants in the Epacridaceae family, a subfamily of Ericaceae. The genus is native to southeastern Australia, New Zealand, Papua New Guinea and the Pacific Islands. Some species in this genus were formerly classified within the genera Cyathodes, Lissanthe, Styphelia and Trochocarpa. The genus is a harder, erect shrub with small sharply pointed leaves and the distinguishable pink berries (although they are also found to be red or white). The plant's fruit is edible, raw or cooked. The genus can grow anywhere between 30 cm to 3 meters in height depending on

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

Amborella is a monotypic genus of understory shrubs or small trees endemic to the main island, Grande Terre, of New Caledonia in the southwest Pacific Ocean. The genus is the only member of the family Amborellaceae and the order Amborellales and contains a single species, Amborella trichopoda. Amborella is of great interest to plant systematists because molecular phylogenetic analyses consistently place it as the sister group to all other flowering plants; as a result, it is critical for understanding angiosperm evolution. It is understood to be the most basal extant flowering plant, and is

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Prioria pinnata is a species of legume in the family Fabaceae. The population has declined considerably because of overexploitation and habitat degradation. Regeneration appears to be very poor. It is found only in India where it is threatened by habitat loss.

Paphiopedilum vietnamense is a species of orchid found from Thái Nguyên Province in northern Vietnam. It was discovered in 1997 and it is endangered.

Leptecophylla juniperina is a species of flowering plant in the family Ericaceae and is native to Australia and New Zealand. It is usually a shrub with narrowly egg-shaped, sharply pointed leaves, bell-shaped flowers arranged singly and white or pink drupes.

Euphorbia labatii is a rare endemic known only from a single locality in Antsiranana Province, Madagascar.

Euphorbia ambarivatoensis is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitat is rocky areas. It is threatened by habitat loss. As most other succulent members of the genus Euphorbia, its trade is regulated under Appendix II of CITES.

Cycas chamaoensis is named after the only known habitat of this species, on and near Khao Chamao mountain in Khao Chamao District, Thailand. Stems are arborescent, either erect or decumbent. Leaves numerous, exceeding 60 per crown, 1.2-2.5 meters in length, ending in terminal spine. Petiole 30–60 cm, glabrous and partially spiny. Leaflets in 85-155 pairs, and lanceolate, glabrous and angled forward at 60-70 degrees. Female cones closed type, sporophylls 13–18 cm long with yellow to gray tomentose. 2-4 ovules per sporophyll. Lamina is long, almost circular, with numerous lateral spines.

Cephalotaxus latifolia is a coniferous shrub or small tree in the family Taxaceae. It is native to southern China and is similar in appearance to both C. sinensis and C. harringtonii.

Caatinganthus is a genus of Brazilian plants in the tribe Vernonieae within the family Asteraceae. Species Caatinganthus harleyi H.Rob. - Bahia Caatinganthus rubropappus (Soar.Nunes) H.Rob. - Pernambuco, Rio Grande do Norte

Bulbophyllum recurvilabre is a species of flowering plant in the family Orchidaceae.

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

Bulbophyllum blepharochilum is a species of flowering plant in the family Orchidaceae.

Allium struzlianum, or Struzl's onion, is a species of onion that is endemic to Armenia. It has been found in the Dzhadzhur Pass and the Urts Range. It can be found on montane steppes between elevations of 800–2,000 m. It flowers in May–June, and bears fruit in June–July. The species is very rare with a severely fragmented population, estimated to be less than 250 individuals. It is threatened by habitat loss and pasturing.

Agnorhiza is a small genus of flowering plants in the family Asteraceae described as a genus in 1998. Its species had previously been considered members of either Wyethia or Balsamorhiza. The plants are native to California, with the range of one species (A. ovata) extending into northern Mexico. They are perennial herbs with sunflower-like flower heads 1 to 4 centimeters wide. Species Agnorhiza bolanderi - Bolander's mule's ears Agnorhiza elata - Hall's mule's ears Agnorhiza invenusta - Coville's mule's ears Agnorhiza ovata - southern mule's ears Agnorhiza reticulata - El Dorado mule's ears

Acharagma roseanum is a succulent cactus native to a small area of mountains of southeastern Coahuila and Nuevo León, Mexico. It grows on rocky limestone hills and xerophytic shrubland. Its name is often misspelled as "Roseana".

Vernoniastrum is a genus of flowering plants belonging to the family Asteraceae. Its native range is tropical and southern Africa, and Madagascar.

Tripora is genus of plants in the family Lamiaceae, first described as a genus in 1999. It includes only one known species, Tripora divaricata, native to Japan, Korea, and China (Gansu, Henan, Hubei, Jiangxi, Shaanxi, Shanxi, Sichuan). It is still referred to by its synonym Caryopteris divaricata in the literature.