Didiereaceae is a family of flowering plants found in continental Africa and Madagascar. It contains 20 species classified in three subfamilies and six genera. Species of the family are succulent plants, growing in sub-arid to arid habitats. Several are known as ornamental plants in specialist succulent collections. The subfamily Didiereoideae is endemic to the southwest of Madagascar, where the species are characteristic elements of the spiny thickets.
Psiadia, commonly known as daisy trees, is a genus of mostly woody Asian and African plants in the tribe Astereae within the family Asteraceae. The genus is distributed throughout the Western Indian Ocean, with species reported from continental Eastern Africa, Madagascar, Mauritius, La Reunion, Rodrigues, the Comoro islands, as well as several of the smaller, uninhabited islands in the Mozambique Channel. Additional species are suspected on Socotra and Sri Lanka, but these have not been confirmed. Phylogenetic studies using DNA sequence data and biogeographic reconstruction using molecular dating have shown that the genus originated on the African mainland, and colonized Madagascar and the outlying islands in the Indian Ocean in several independent instances of overwater dispersal in the Miocene.
Marojejya is a genus of flowering plant in the family Arecaceae. It contains the following two species, both endemic to Madagascar:
Decastylocarpus is a genus of flowering plants in the family Asteraceae.
Diaphractanthus is a genus of flowering plants in the family Asteraceae.
Gladiopappus is a genus of flowering plants in the family Asteraceae.
Grangeopsis is a genus of flowering plants in the family Asteraceae.
Vernoniopsis is a genus of flowering plants in the aster tribe within the sunflower family.
Oliganthes is a genus of flowering plants in the tribe Vernonieae within the family Asteraceae.
Catatia is a genus of flowering plants in the family Asteraceae.
Colobanthera is a genus of flowering plants in the family Asteraceae.
Jean-Henri Humbert was a French botanist born in Paris.
René Viguier was a French botanist known for his investigations of plants within the family Araliaceae.
Tsebona is a genus of the plant family Sapotaceae described as a genus in 1962.
Chrysogonum perrieri is a species of plants in the family Asteraceae. It is found only in Madagascar.
Oeceoclades humbertii is a terrestrial orchid species in the genus Oeceoclades that is endemic to southeastern Madagascar, where it grows in xerophilous bush at altitudes from 500 to 600 m. It was first described by the French botanist Joseph Marie Henry Alfred Perrier de la Bâthie in 1939 as Lissochilus humbertii and moved to the genus Eulophia in 1975 by Friedhelm Reinhold Butzin. It was last transferred to the genus Oeceoclades in 2001 by Jean Marie Bosser and Philippe Morat. The type specimen was collected from the left bank of the Manambolo valley in the Mandrare River basin in either December 1933 or January 1934 when it was recorded as flowering by its collector Jean-Henri Humbert for whom the specific epithet humbertii honors. The small pseudobulbs are conical and heteroblastic. Oeceoclades humbertii is distinguished from all other Oeceoclades by its completely green flowers. It has only been collected twice including the type specimen; the other specimen was collected by Philippe Morat in 1973 from the Onilahy valley in the Ankazoabo gorges north of Betioky.
Monique Keraudren-Aymonin was a French botanist and botanical illustrator and photographer.
Humbertiella is a genus of plants, in the Malvaceae from Madagascar. The genus was named in 1926 for Jean-Henri Humbert (1887–1967), a French botanist and conservationist.
Barthlottia madagascariensis is the only species in the genus Barthlottia of flowering plants in the family Scrophulariaceae. The large shrub with conspicuous purple flowers is native to a very restricted area in southeast Madagascar and was described in 1996.
Humbertiodendron is a monotypic genus of flowering plants belonging to the family Trigoniaceae. The only species is Humbertiodendron saboureaui.
