Tree native to the USA with an upright, rounded crown, initially spiny branches, and smooth bark. Deciduous leaves, brown at first then green, composed of 11-21 leaflets. Blooms abundantly in May-June with clusters of dark red, fragrant flowers 2-3 cm long. Requires a sheltered position from winds, is resistant to pollution, and has the same cultivation needs as Robinia pseudoacacia. Used alone as a shade tree or along avenues.