Note that the key in Budd's Flora allows either of the following characteristics for danicus, providing separate paths to the same species plants low, cushion-like, matted or straggling plants with erect or decumbent stems

 

Note that Flora of Alberta keys danicus as having the following characteristics: plants with elongated stems, either prostrate or erect; not plants with short stems, cushion-like, low-tufted, or matted main stems prostrate, or decumbent at base and ascending; not having main stems erect from the base and mostly tall main stems decumbent at base and ascending; not prostrate with wide-spreading stems low plants, often mat-forming

Note that two of the five petals in flowers from family Leguminosae are usually united along one edge.  The keys in the flora appear to make conflicting statements about the petals being or not being united.  However, legume flowers are unmistakable.

 

Danicus Characteristics plants with slender rootstalks, not with taproot and caudex stems 5-30 cm long leaves with at least 7 leaflets leaflets not spine-tipped pubescence of the leaflets composed of basifixed, not malpighian, hairs flowers born on more or less well developed peduncles inflorescence a short, dense, head-like raceme, about as long as wide flowers 16-18 mm long flowers and pods all erect flowers at least partly reddish, purplish, or bluish; not yellowish pods densely pubescent

 

Astragalus Characteristics herbs leaves pinnately divided 5 to 25 leaflets terminal leaflet normal, not a tendril leaves not glandular keel not truncate, but not tipped with a point pods not segmented or jointed pods not breaking into 1 seeded segments

 

Leguminosae Characteristics plants terrestrial plants not with milky coloured juice more than one leaf some or all leaves alternate leaves with stipules both sepals and petals present usually 5 sepals, or wholly united petals distinct from each other, not united in a tube corolla with petals more or less united 5 petals, of which 2 are usually united along one edge calyx regular corolla irregular, pea-like stamens more numerous than the corolla lobes stamens usually separate or partly so, not in a column ovary 1-loculed placentae parietal 1 placenta fruit a legume