Robinia acacia is a species of the family Fabaceae.
It is a tree that reaches 20 to 30 m high. It is very often sucky and forms groves sometimes invasive. The trunk is gray-brown with a thick bark deeply deeply fissured longitudinally. The suckers and young branches are thorny.
Deciduous leaves are imparipinnate, with a large number (9 to 19) of oval leaflets; the stipules of the leaves borne by the non-flowering twigs are transformed into sharp spines, which persist several years after the fall of the leaves.
The flowers are white, in pendulous bunches fragrant and honey-like, 10 to 25 cm long. It is a precious honey plant. The acacia honey is never marketed under this name, but under the name of “acacia honey”, which is botanically false but is a designation tolerated by use.
The fruits are flattened pods, 7 to 12 cm long, containing several seeds. They remain attached to the tree well after the leaves fall.
Sources 2016 : ONF, CRPF, DRAAF, WIKIPEDIA