Caltha palustris

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Caltha palustris

a toxic plant in the family Ranunculaceae; contains a vesicant substance protoanemonin. Ingestion of the plant causes stomatitis, salivation, diarrhea and abdominal pain. Called also marsh marigold, cowslip, kingcup.
References in periodicals archive ?
26) Though she admits that such domestic dedication seems to suit her neighbor, Elizabeth claims the right to determine her own course, predicated on her unique gifts and skills, rather than on the basis of women's universal calling: "I don't think I shall ever try to follow in her steps, my talents not being of the energetic and organising variety, but rather of that order which makes their owner almost lamentably prone to take up a volume of poetry and wander out to where the kingcups grow".
Try kingcups (Caltha palustris), the flowering rush (Butomus umbellatus), with its lovely pink flowers, and Japanese iris.
Brenda Sutton, Hampshire: Try kingcups, reeds - but not bulrushes as they take over- and a lily - but not the big white one as it's too vigorous.
Gorgeous irises, kingcups - in full yellow flower now - and reeds and rushes galore including butomus, the flowering rush, which isn't actually a rush at all.