Potentilla arguta, Pursh. Similar to P. rupestris, but with a more strict habit, more glandular-hirsute pubescence, more congested infl, and smaller cream-colored petals which scarcely exceed or are shorter than the sepals; calyx enlarging more in fr., and receptacle becoming elongated, much swollen and almost fleshy. June-Aug. N. Amer. Good for dry rocky soil.