Involucre bracts with a flat blade surface, or with blades cut into linear divisions. Callus not differentiated. Nectaries in bisexual flowers present, or absent. Styles base not enlarged, continuous with the achene. Stigmas per style 1.
Legume valves straight.
Styles style modified modifying and persisting, or style may persist until dehiscence but is not modified. Arctic, or high arctic, or low arctic, or alpine, or boreal. Range in the Canadian Arctic Archipelago wide-spread, or limited, or moderate. Common, or uncommon, or rare. Alaska, Ariz., Calif., Colo., Idaho., Maine, Mich., Minn., Mont., Nev., N.H., N.Mex., N.York, Oreg., S. Dak., Utah, Vt., Wash., Wyo.