Henri Louis Poisson

Aloe vaombe is a species of aloe endemic to southern Madagascar. It is a succulent, evergreen plant with an unbranched stem up to 5 meters in height, and 20 cm in diameter.

Euphorbia arahaka is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical dry shrubland, and sandy shores. It is threatened by habitat loss.

Pachypodium ambongense is a species of plant in the family Apocynaceae. It was first published as a species of the genus Pachypodium in 1924 by the botanist Henri Louis Poisson. Having a habit as a shrub that is 1–2 m (3+1⁄2–6+1⁄2 ft) and bottle-shaped, Pachypodium ambongense inhabits the western low, open deciduous forest of Madagascar on a substrate of Mesozoic calcareous rock. It is fairly rare to the landscape, perhaps, suggesting a more specialized environment needed for it to grow. It is known by common name in Madagascar as "Songosongo" or "Betono."

Pachypodium horombense is a species of Pachypodium endemic to Madagascar. The plant trunk is pachycaul, and typically short and fat. It produces large, campanulate, yellow flowers.

Euphorbia fiherenensis is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical dry shrubland, and rocky areas. It is threatened by habitat loss.

Pachypodium decaryi is a flowering plant, and a member of the family Apocynaceae. This species was first described in 1922 by Henri Louis Poisson. It is native to central Madagascar, growing on bare rocks with little water and a lot of sunlight. The caudex (swollen stem base) of this species can grow to 40 centimetres in diameter, and the taller stems can grow up to three or four meters. It blooms with white flowers.

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

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Euphorbia mainty is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland. It is threatened by habitat loss.

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Acropogon megaphyllus is a species of flowering plant in the family Malvaceae. It is found only in New Caledonia.

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