Alluaudia dumosa, also known as dense alluaudia or Boers' umbrella, is a species of plant in the genus Alluaudia and the family Didiereaceae.
Etymology The species name 'dumosa' (from Latin 'dumosus') means 'bushy, growing as a bush'.
Description Alluaudia dumosa initially grows as an upright shrub. Later, the shoots become prostrate and finally the plants grow tree-shaped. They reach heights of . The thick and fleshy shoots are covered with tiny, scattered and weak, black thorns. These grow up to in size. The tender fleshy leaves are almost stem-round and soon fall off. They are long and in diameter.
The whitish flowers appear in small, cymous inflorescences and grow up to in size. The fruits are elongated in shape.
Distribution and habitat Alluaudia dumosa is distributed in the southeast of Madagascar, in the area between Ambovombe and Ampanihy. The species is on the IUCN Red List and is considered Least Concern.Alluaudia dumosa in the IUCN Red List of Threatened Species 2020-3. Posted by: Ramanantsialonina, R.N., 2018. Retrieved 4 December 2025
Alluaudia dumosa was first formally described in 1901 as Didierea dumosa by French botanist, Emmanuel Drake del Castillo.Comptes Rendus Hebdomadaires des Séances de l'Academie des Sciences Paris, 133: 241, 1901 In 1903, Castillo placed the species in the newly established genus Alluaudia.Bulletin du Muséum d'Histoire Naturelle Paris, ix. 37, 1903.
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