EnglishWikipedia has an article on:

kingcup

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Wikispecies has information on:

Caltha palustris

Fromking +‎cup.

• IPA^(key): /ˈkɪŋkʌp/

kingcup (pluralkingcups)

1. (British, dialectal) Any of various species ofbuttercup, or themarsh marigold,Caltha palustris.
   • 1979, Angela Carter, ‘The Erl-King’,The Bloody Chamber, Vintage, published2006, page99:

     He told me how the wise toad who squats among thekingcups by the stream in summer has a very precious jewel in his head.

• pick gun,pucking

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• en:Buttercup family plants

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