Nicolas Hallé

Clematepistephium is a monotypic genus of orchids containing only one known species, Clematepistephium smilacifolium, endemic to the island of New Caledonia. Its closest relative is Eriaxis, also endemic to New Caledonia.

Ayenia ivorensis is a tree in the family Malvaceae that is now classified as extinct. It was identified from a single herbarium specimen collected in the Upper Guinean forests of Ivory Coast.

Bulbophyllum corythium is a species of orchid in the genus Bulbophyllum. It is endemic to New Caledonia.

Nesogordonia papaverifera is a species of flowering plant. Traditionally included in the family Sterculiaceae, it is included in the expanded Malvaceae in the APG and most subsequent systematics. It is found in Benin, Cameroon, Central African Republic, Republic of the Congo, Ivory Coast, Gabon, Ghana, Liberia, Nigeria, and Sierra Leone. It is becoming rare due to by habitat loss.

Bulbophyllum lophoglottis is a species of orchid in the genus Bulbophyllum. It is a pseudobulbous epiphyte endemic to Mt. Ouin in southeastern New Caledonia.

Bulbophyllum keekee is a species of orchid in the genus Bulbophyllum, native to New Caledonia. It is protected in the northern province. The species epithet, keekee, honours Hugh Shaw MacKee, a botanist who collected for over 30 years in New Caledonia.

Tricalysia atherura is a species of plant in the family Rubiaceae. It is found in Cameroon and Gabon. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.

Semialarium is a genus of flowering plants belonging to the family Celastraceae. It includes two species native to Mexico and tropical South America. Species: Semialarium mexicanum (Miers) Mennega – Mexico, Central America, and Venezuela Semialarium paniculatum (Mart.) N.Hallé – central, eastern, and southern Brazil, Colombia, and Paraguay

Reissantia is a genus of flowering plants belonging to the family Celastraceae. Its native range is Tropical and Subtropical Old World. This includes parts of Africa (Angola, Benin, Botswana, Cameroon, Caprivi Strip, Central African Republic, Congo, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Gulf of Guinea Islands, Ivory Coast, Liberia, Madagascar, Malawi, Mali, Mozambique, Namibia, Nigeria, Northern Provinces (in South Africa), Senegal, Sierra Leone, Sudan, Tanzania, Uganda, Zambia, Zaïre and Zimbabwe), and parts of Asia (Andaman Islands, Assam, Bangladesh, Borneo, Cambodia, China

Leeuwenbergia is a plant genus of the family Euphorbiaceae first described as a genus in 1974 and named in honor of Toon Leeuwenberg. The entire genus is endemic to tropical west-central Africa. Species Leeuwenbergia africana Letouzey & N.Hallé - Cameroon, Gabon, Republic of the Congo, Democratic Republic of the Congo Leeuwenbergia letestui Letouzey & N.Hallé - Gabon

Cola lizae is a species of flowering plant in the family Malvaceae. It is found only in Gabon. It is threatened by habitat loss. This species was first described in 1987 and named after Liz Williamson, a researcher at Lopé.

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Arnicratea is a genus of flowering plants belonging to the family Celastraceae. Its native range is Tropical Asia. Species: Arnicratea cambodiana (Pierre) N.Hallé Arnicratea ferruginea (King) N.Hallé

Tricalysia obstetrix is a species of plant in the family Rubiaceae. It is endemic to Gabon. It is threatened by habitat loss.

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Tapura neglecta is a species of plant in the Dichapetalaceae family. It is endemic to Gabon.

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Salacia miegei is a species of plant in the family Celastraceae. It is endemic to Côte d'Ivoire, where it grows in Western Guinean lowland forests, including Taï National Park, a protected area of primary rainforest and high endemism. It is threatened by habitat loss.

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Peristylus holochila is a rare species of orchid known by the common name Hawaii bog orchid. It is endemic to Hawaii. It is a federally listed endangered species of the United States. When the orchid was added to the Endangered Species List in 1996 there were fewer than 35 individuals remaining, divided amongst small populations located on the islands of Kauai, Maui, and Molokai. It has been extirpated from Oahu. By 2009 there were three populations for a total of 26 plants. There is only one plant remaining on Kauai and one on Maui, but neither have been observed recently. Hurricane Iniki

Monosalpinx is a genus of flowering plants belonging to the family Rubiaceae. Its native range is Western Tropical Africa. Species: Monosalpinx guillaumetii N.Hallé

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Cyclophyllum barbatum is a species of flowering plant in the family Rubiaceae. It is a shrub or tree native to the South Pacific, including the Caroline Islands, Cook Islands, Fiji, Marquesas Islands, Pitcairn Islands, Samoan Islands, Society Islands, Solomon Islands, Tonga, Tuamotu Archipelago, Tubuai Islands, and Vanuatu. It has been introduced to Hawaii.

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