...In the case of the two green kingfishers, I am inclined to think that the yellow of that shining field of buttercups in some way produced the illusion... 
W. H. Hudson 「Birds in Town and Village」
...The two flowersoftenest noticed by the chance comer to these parts are the (the"mountain daisy"!) and the pretty ,with its handsome crinkled leaves and its bright yellow blossoms,like buttercups...
Bradford Torrey 「The Foot-path Way」
...When I returned, he had moved two paces, he said (he had really moved four), and we spent a half hour stooping over the daisies and the buttercups, looking for the lost clew...
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
...He jumped forthe golden buttercups, nipping them from their stems...
Edith M. Patch 「Bird Stories」
...When I returned, hehad moved two paces, he said (he had reallymoved four), and we spent a half-hour stoopingover the daisies and the buttercups, looking forthe lost clew...
John Burroughs 「Bird Stories from Burroughs」
...In the Tropics there is nothingcomparable in colour with the blue hyacinths, the fieldsof buttercups, or the gorse and hawthorns of thiscountry...
A. F. R. Wollaston 「Pygmies and Papuans」
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