What is (a) Resembling, or consisting of, an ament or aments; as, the chestnut has an amentaceous inflorescence. (b) Bearing aments; having flowers arranged in aments; as, amentaceous plants called?

amentaceous — (a) Resembling, or consisting of, an ament or aments; as, the chestnut has an amentaceous inflorescence. (b) Bearing aments; having flowers arranged in aments; as, amentaceous plants. (Webster's 1913.)

Sources