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Very nearly allied to A. arabica, from which it principally differs in the tuberculate articles of the legume. Spines straight, slender. Pinnæ in 6–8 pairs with a sessile gland between the lowest and one or two of the upper or all the pairs, rachis pubescent; leaflets in 10–15 pairs, linear, subacute. Inflorescence and bracts as in A. arabica. Calyx shortly and obtusely toothed. Petals connate 3/4 of their length, scarcely twice as long as the calyx. Legume linear, compressed, more or less distinctly moniliform, glabrous, each article with a prominent central tubercle.