Like A. echinatus but leaves without conspicuous marginal teeth and with at most only rudimentary inflexed spines in leaf recesses. Involucel bracts obovate, lateral margins rolled inwards. Fruit with one mericarp aborted, mericarps, slightly rugose, white, not separating when mature.
Like A. echinatus but leaves with marginal teeth inconspicuous, inflexed spines absent or rudimentary, involucel bracts obovate, lateral margins rolled inwards, with 1 or 2 lateral bristles, somewhat enlarging and leathery in fruit. Mericarps slightly rugose, not separating.