Summer photo by
This member of the Apocynaceae family was
given this name by S.H.J.V. Rapanarivo in
1999. It is found on Isalo mountains between 300 and 1000 m. It grows on sandstone
escarpment with some humus. The shape of the caudex looks like a
more or less regular balloon. The stem will grow up to two
centimetres in diameter and reach a height of 60 centimetres. The
leaves are lanceolate and smaller than other rosulatum.