potentilla
Concise Oxford English Dictionary © 2008 Oxford University Press:
potentilla /ˌpəʊt(ə)nˈtɪlə/
▶noun a plant of a genus that includes the cinquefoils, especially a small shrub with yellow or red flowers. [Genus Potentilla: many species.]
– origin mod. L., based on L. potent- ‘being powerful’ (with ref. to its herbal qualities) + the dimin. suffix -illa.
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