1. Ovary and fruit ± densely pubescent with long hairs; escapes from cultivation in disturbed places.

A. cicer

1. Ovary and fruit glabrous or nearly so; native species.

2. Pubescence of stem and leaves including many 2-pronged hairs; stipules (at least the lower) connate with a belt of tissue around the stem; fruit 4.5-6.5 mm thick, 2-locular; plants rhizomatous.

A. canadensis

2. Pubescence of stem and leaves all of simple hairs; stipules not connate; fruit 10-15 mm thick, 1-locular; plant from a taproot.

A. neglectus